最新刊期
      卷 42 ， 期 1 ， 2022
      • Lu Gang,Chen Yisi,Yan Qingsong,Mao Pu,Tu Zhixin,Huang Pengpeng
        Vol. 42, Issue 1, Pages: 1-6(2022) DOI: 10.15980/j.tzzz.2022.01.001
        摘要：In order to meet the requirements for producing lightweight, thin-walled and complicated aluminum alloy parts, a new casting process was put forward. Based on the vacuum counter pressure casting, the microstructure and mechanical properties of ZL114 A alloy castings with different axial diameters were investigated under the adaptive pressure regulation. The evolution of solidification microstructure and the dendrite morphology were observed by optical microscope and scanning electron microscope. The effects of holding pressure, solidification counter-pressure and graded counter-pressure on the creep properties of ZL114 A alloy specimen were emphatically analyzed, and effects of creep temperature and creep stress on the creep properties were further discussed. The results indicate that the microstructure of ZL114 A castings under controlled-pressure tends to densify, while the dendrite is obviously refined under pressure extrusion and seepage. Meanwhile, mechanism of creep fracture is dominated by grain boundary slip. The creep resistance of castings with high pressure and strong counter-pressure is significantly improved, which is attributed to the fact that the transformation of eutectic silicon structure restrains the initiation, propagation of cracks and the reduction of grain boundary micropores.  
        关键词：Controlled-pressure Casting;ZL114A alloy;Microstructure;Creep Behavior;SDAS   
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        发布时间：2023-12-18
      • Xing Shuming,Xing Ruoyu
        Vol. 42, Issue 1, Pages: 7-13(2022) DOI: 10.15980/j.tzzz.2022.01.002
        摘要：In recent years, all kinds of special casting technologies take a greater progress based on their crossover and integration. Non-gravity factors were continuously introduced into the gravity casting technology, which developed towards pressure casting. The die casting technology was developed towards low speed and heat treatment while maintaining advantages in producing thin-walled complex parts. The low pressure and differential pressure casting technologies were developed towards higher pressure. Meanwhile, the semi-solid casting technology began to desalt the “semi-solid” characteristics and was developed towards the crossovers of liquid forming and solid forming. The physical essence of crossover and intergrated development is the combination of rheological filling, rheological solidification and rheological feeding.  
        关键词：Interdisciplinary;Low Pressure Casting;Semi-solid Casting;Squeeze Casting   
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      • Vol. 42, Issue 1, Pages: 3(2022)
        摘要：<正>1、会议主办单位中国机械工程学会铸造分会中国兵工学会材料科学与技术专业委员会中国机械工程学会塑性工程分会《特种铸造及有色合金》杂志社（武汉）2、会议承办单位《特种铸造及有色合金》杂志社（武汉）3、会议地点待定4、会议时间2022年秋季（11月前后,具体时间待定）5、征文内容与压铸（包含高真空压铸,局部加压）、低压铸造、挤压铸造、差压铸造、半固态加工相关的论文（含生产技术、企业管理、产业分析、市场动态、营销策略、发展展望等）皆可应征。  
          
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      • Vol. 42, Issue 1, Pages: 6(2022)
        摘要：<正>近年来,汽车轻量化的发展为扩大铝应用提供了广阔的市场空间,相关机构预计,到2025年,汽车整车较2015年将减重20%,单车用铝量达到250kg;到2030年,较2015年将减重35%,单车用铝量达到350kg。可见,未来汽车轻量化铝应用市场不容小觑。以下为2021年汽车轻量化铝合金材料应用行业十大重要事件。  
          
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      • Vol. 42, Issue 1, Pages: 21(2022)
        摘要：<正>近日,南方科技大学机械与能源工程系逯文君助理教授团队、德国马普钢铁所Dierk Raabe教授团队和新加坡制造技术研究院Sharon Mui Ling Nai团队在Materials Today联合发表论文,报道了一种通过选择性激光熔化（SLM）和热处理技术制造出的具有前所未有的强度-韧性协同作用的无裂纹7000系铝合金材料。研究发现,通过SLM+热处理工艺,使AlZnMgCuScZr铝合金的高强度超过了647 MPa,这是SLM生产的铝合金的高报告值,同时具有约11.6%的可观延展性。具有可调节分级微观结构的高强度的Al7000系列合金的成功制造为设计和微调SLM工艺生产高机械载荷作用下的铝合金部件铺平了道路。  
          
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      • Vol. 42, Issue 1, Pages: 31(2022)
        摘要：<正>近日,科技部国家重点研发计划"先进结构与复合材料"重点专项2021年度项目正式揭晓,由上海交通大学为项目牵头单位、万丰镁瑞丁为课题牵头单位申报的"高性能镁合金大型铸/锻成形与应用关键技术项目"获立项支持。该项目以高性能镁合金大型铸/锻件成形及应用为目标,根据新能源汽车、高速列车、航空航天等领域的轻量化需求,从基础研究、关键技术和示范应用3个层面开展课题研究,实现大型镁合金铸/锻件在新能源汽车、高速列车、航空航天等重大装备上的考核验证和示范应用,形成工业化规模生产能力。  
          
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      • Vol. 42, Issue 1, Pages: 54(2022)
        摘要：<正>2021年12月初,中国汽车工业协会发布汽车工业经济运行数据。11月,汽车产销分别完成258.5万辆和252.2万辆,产销环比分别增长10.9%和8.1%,同比分别下降9.3%和9.1%。其中,新能源汽车产销分别完成45.7万辆和45万辆,同比分别增长1.3倍和1.2倍,产销继续刷新新记录。1～11月,汽车产销分别完成2 317.2万辆和2 348.9万辆,同比分别增长3.5%和4.5%。其中,乘用车产销分别完成1 887.9万辆和1 906万辆,同比分别增长6.9%和7.1%;商用车产销分别完成429.3万辆和442.9万辆,  
          
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      • Vol. 42, Issue 1, Pages: 82(2022)
        摘要：<正>据媒体报道,特斯拉上海工厂的国产化率已到达90%以上。除了核心的芯片、集成电路部分,车身其他部分都是中国制造。截至目前,国内公开可查直接、间接供货特斯拉的上市企业,已经高达186家。其中,由上海、苏州、宁波、无锡等制造业强市组成的长三角特斯拉供应商数量多达85家。从20世纪60年代手工制造压铸模具到如今9 000t压铸单元发布,  
          
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      • Vol. 42, Issue 1, Pages: 135-136(2022)
        摘要：<正>现阶段,我国的工业发展水平已经到达了一个新的阶段,工业领域及工业相关产业已经逐步由过去的密集型劳动向智能化、自动化生产过渡。在现代的工业社会中,锻造领域及锻造相关产业作为工业发展的中坚力量,其扮演了制造半成品,并为上游工业领域提供基础设备的重要角色,因此,工业领域中锻造产业的蓬勃发展已经成为保证并促进工业长足可持续发展的主要领域之一。面对这一工业发展背景,不断为锻造领域培养符合要求的时代工作者已经成为相关领域管理者及教育学者所重点考虑的问题之一,这关系着工业社会的整体发展进程,并牵动着经济社会与文化社会的不断进步。  
          
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      • Vol. 42, Issue 1, Pages: 137-138(2022)
        摘要：<正>在当下全球工业、经济一体化发展的时代背景下,中外贸易的频率、广度与深度都得到了进一步加强,这一方面反映了我国工业社会发展速度与发展水平的提高,另一方面也为各行业的发展提出了全新需求。铸造行业作为工业社会中的中流砥柱产业,其进步无法脱离于世界发展进程,而铸造资料的汉英翻译与汉英交流则是紧跟世界发展潮流的重要桥梁。（1）目的论视角下的汉英翻译概述及关键点分析目的论是一种以任务中心或人为核心的问题解决办法,  
          
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      • Vol. 42, Issue 1, Pages: 139-140(2022)
        摘要：<正>在现代工业社会的发展过程中,其创新与进步速度不断提高,这为我国社会创造了极大的物质财富与技术价值,且促进了工业生产相关领域的协同发展步伐。同时,现阶段的工业生产过程已经不再是传统的密集型劳动,其逐步转向于以自动化生产技术为生产工具、以智能化生产模式为生产流程、以信息化管理为运营方案的新时代产业,这一方面代表了我国工业社会的现代发展水平,另一方面也为行业的发展与技术的创新提出了全新的要求。  
          
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      • Vol. 42, Issue 1, Pages: 141-142(2022)
        摘要：<正>随着我国由制造业大国向制造业强国不断转型,全面推进高技能复合型人才创新创业,逐步扩大社会各领域经济市场和人才市场,逐步打造新的经济增长点,成为全面推动社会经济发展的有效方法。创新创业人才培养不仅是劳动与社会保障部门的工作,而且也是各个企业的工作,企业只有将创新创业教育与人才劳动技能培养深度融合,才能全面强化铸造合金专业人才创新创业能力与劳动技术能力。因此,教育者完全有必要全面推进创新创业教育与劳动技能教育深度融合,全面落实人才培养思想。  
          
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      • Vol. 42, Issue 1, Pages: 143-144(2022)
        摘要：<正>随着改革开放进程的进一步加快,我国教育事业的发展在近几十年内发生了翻天覆地的变化,其不但体现在教育质量的提高、教育水平的加强与教育事业的重视,也充分展现在与教育相关的思想教育与思想政治体系建设之中,成就了一批又一批品学兼优、思想端正、职业素养优秀的学子。近年,关于重视高校学生思想教育建设的呼声越来越大,其一方面关系着高校学生的思想与心理健康,另一方面也是高校学生进入社会后的重要标准。  
          
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      • Vol. 42, Issue 1, Pages: 145-146(2022)
        摘要：<正>在当前全球化发展的社会中,英语能力是每个专业学生都应该掌握的必备技能。有效的英语教学课程的开展,除了要帮助学生掌握基础的专业知识,提升专业英语水平,更要能在就业和实际应用当中提高学生的能力。铸造专业作为工科专业的重要学科,目前该专业的多数标准都是西方国家所创办的,因此掌握必要的英语词汇知识,对铸造专业学生来说有着重要的意义。铸造专业的英语词汇也是具有专业特点和内涵的英语知识,需要掌握更多相关的专业词汇和专业词组才能够更好地理解前沿文献和技术文件等。  
          
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      • Vol. 42, Issue 1, Pages: 147-148(2022)
        摘要：<正>近年来随着现代社会的发展,消费铸造产品大量丰富,插画作为紧密联系包装与铸造产品的设计表现形式,其独有的艺术表现和深刻内涵意义正日益受到大众的关注,使它在商品的购买中占据了重要的地位。具有现代表现特征的欧美复古插画不仅通过凸显铸造产品的视觉信息内容影响到铸造产品本身的销售,而且对于企业深层次的品牌文化与企业精神都有着很强的作用,让品牌深入人心。另一方面,欧美复古插画使得艺术文化自然地灌注到了铸造产品中去,  
          
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      • Vol. 42, Issue 1, Pages: 149-150(2022)
        摘要：<正>近年来,全球科技水平得到了进一步的发展与开拓,各类新兴技术与新兴科技产品层出不穷,这有效地改善了人们生活的方方面面,使生活中的各个细节都得到了充分改良与优化,也让人们正式进入新一轮的技术热潮,即电子信息化世界。在当下这种科技发展背景下,新兴的科技产品不但对人们的日常生活各方面产生了深远影响,也对包括工业设备在内的其他各领域发展得到推动,创造出了极大的物质财富与精神财富。铸造行业作为工业社会中的中流砥柱型产业,在近几十年的发展中已然发生了翻天覆地的变化,其相较于传统生产时期,  
          
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      • Han Xiaolei,Du Zhiwei,Che Cong,Peng Yonggang,Xu Yunpei,Li Cong
        Vol. 42, Issue 1, Pages: 14-18(2022) DOI: 10.15980/j.tzzz.2022.01.003
        摘要：The EBSD specimen preparation method suitable for NdFeB magnets was set up, which was composed of mechanical polishing and vibration polishing. Microstructures of sintered NdFeB materials were investigated by scanning electron microcopy（SEM）、energy dispersive spectrum（EDS） and electron backscatter diffraction（EBSD） equipment. The results indicate that sintered NdFeB magnets are composed of matrix phases（Nd, Pr）2Fe14B, Nd-rich, Pr-rich phases and boron-rich phases. The EBSD results reveal that the matrix phases of alloy have strong preferred crystallographic orientation that c axis runs parallel to magnetic orientation axis. The grain size of most matrix phases is 2～7 μm, and the average size is around 4 μm. The BSE contrast of boron-rich phase at low electron accelerating voltage（5 kV） is superior than that at 20 kV. Energy spectrum analysis proves that blocky boron-rich phase is mainly composed of Fe, Nb and B, of which the micro zone can be analyzed quantitatively using virtual standard specimen library at electron accelerating voltage of 5 kV.  
        关键词：NdFeB;(Nd,Pr)2Fe14B Phase;Boron-rich Phase;EBSD;Crystallographic Orientation   
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      • Feng Jun,Bi Yuyu
        Vol. 42, Issue 1, Pages: 18-21(2022) DOI: 10.15980/j.tzzz.2022.01.004
        摘要：Taking continuous casting grid equipment as the research object, through the analysis of heat transfer process of continuous casting grid, continuous casting grid process function model was established based on the first law of thermodynamics（energy conservation）, and the function of continuous casting process was simplified combining with the actual operation parameters of continuous casting grid equipment on the sheeting. Taking the actual operating parameters of domestic and foreign continuous casting grid equipment as an example, the theoretical speeds that can maintain stable operation of domestic and foreign continuous casting grid equipment were calculated, respectively, which were subsequently compared with the actual speeds. The relative errors between the theoretical speed and the actual speed are 1.8% and 4.3%, respectively, meeting the requirement of the project. Herein, the established function model of the continuous casting grid process has a certain guiding significance for the stable production and automatic control of the continuous casting grid equipment.  
        关键词：Continuous Casting Grid;Heat Transfer;the First Law of Thermodynamics;Process Function   
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      • Xue Liwen,Zhou Wenqiang,Piao Yi′nan,Zhao Haidong,Zhang Mengna,Jia Hailong,Ma Pinkui,Song Jiawang,Zha Min,Wang Huiyuan
        Vol. 42, Issue 1, Pages: 22-31(2022) DOI: 10.15980/j.tzzz.2022.01.005
        摘要：Al-Si alloys have the advantages of good fluidity, corrosion resistance, high specific strength, and low thermal expansion coefficient, which are widely used in cast aluminum alloys. Due to the development demand for lightweight in the automobile field, the higher requirements were put forward for the improvement of strength and ductility of Al-Si alloys. Squeeze casting can produce complex thin-walled aluminum alloy castings with compact structures, high surface quality, and good mechanical properties, showing a broad application prospect in the field of automobile parts. The effects of alloying elements, inoculation modification on microstructure evolution and performance of squeeze casting Al-Si alloy composites were reviewed, which provide a reference for the preparation of high performance Al-Si alloy by squeeze casting in the future.  
        关键词：Squeeze Casting;Al-Si Alloys;Alloying Elements;Inoculation Modification;Mechanical Properties   
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      • Vol. 42, Issue 1, Pages: 32-35(2022) DOI: 10.15980/j.tzzz.2022.01.006
        摘要：The effects of pre-aging on the microstructure, hardness and electrical conductivity of Cu-6 Ag alloy were investigated and compared with those of specimens subjected to single-stage precipitation aging. The results indicate that the optimal pre-aging time is 8 h. Meanwhile, the size of precipitates has no obvious change, where the spacing of precipitates are decreased compared with that of the single-stage aging specimens, leading to an increase of hardness by 9.4 HV. However, effects on the electrical conductivity can be neglected.  
        关键词：Cu-6Ag Alloy;Pre-aging;Hardness;Electrical Conductivity   
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      • Wen Hongyan,Ye Peiyi,Dong Xu,Xu Lianyou,Fan Xiaoming
        Vol. 42, Issue 1, Pages: 36-39(2022) DOI: 10.15980/j.tzzz.2022.01.007
        摘要：Three ternary alloys, Mg-19 Al-24 Ga, Mg-15 Al-25 Ga and Mg-15 Al-31 Ga, were designed and prepared experimentally, and their phase composition, microstructure and heat storage properties were investigated. The results show that the all alloys consist of Mg5Ga2, Al12Mg17 and α-Mg phases, and have high latent heat of phase transition, of which the temperature are in the range of middle temperature thermal energy storage（90～400 ℃）. The Mg-19 Al-24 Ga alloy has the lowest phase transition temperature and the highest latent heat, which are 373.67 ℃ and 172.70 J·g-1, respectively. Therefore, Mg-19 Al-24 Ga alloy can be a good phase transition material for middle temperature heat storage.  
        关键词：Mg-Al-Ga Alloy;Phase Transition Materials;Thermal Energy Storage;Microstructure   
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      • Xu Kehao,Fu Gaosheng,Song Lili,Chen Hongling,Wang Huosheng
        Vol. 42, Issue 1, Pages: 40-45(2022) DOI: 10.15980/j.tzzz.2022.01.008
        摘要：The crystal structure, formation enthalpy, binding energy, elastic properties and density of states of Al-Ce binary intermetallic compounds were calculated and analyzed by first-principle calculations based on density functional theory. The results indicate that Al2Ce-Fd3 m has the desirable compound formation ability, while AlCe3-P21/m has the excellent structural stability. Meanwhile, the calculation results of elastic properties reveal that only Al11Ce3-Immm, Al2Ce-Fd3 m, Al4Ce-I4/mmm and AlCe3-P21/m can exist stably, where Al11Ce3-Immm and Al2Ce-Fd3 m have stronger resistance to volume deformation and shear deformation, with greater stiffness than that of Al4Ce-I4/mmm and AlCe3-P21/m. Therefore, Al4Ce-I4/mmm and Al2Ce-Fd3 m belong to plastic materials, while Al11Ce3-Immm and AlCe3-P21/m present brittle materials. Density of states analysis demonstrates that the four stable compounds have similar valence bonds, exhibiting metallic behavior, where Al4Ce-I4/mmm compound is the most covalent and AlCe3-P21/m is the least.  
        关键词：Al-Ce Alloy;Intermetallic Compound;First-principle Theory;Structural Stability;Elastic Properties   
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      • Liu Jing,Luo Gan,Wen Cheng,Du Jun
        Vol. 42, Issue 1, Pages: 46-50(2022) DOI: 10.15980/j.tzzz.2022.01.009
        摘要：Mn is one of the most common alloying elements in commercial Al alloys, which, however, can significantly reduce the electrical conductivity of Al alloys. The Al-7 Si-1 Fe alloy containing Mn was modified by B and Y elements to reveal the influences on its electrical conductivity as well as the modification mechanism. The results indicate that B and Y elements can effectively improve the electrical conductivity of the alloys, where the coarse slate-like eutectic silicon is transformed into the fine coral-like under the condition of Y. Meanwhile, the long needle-like Fe-rich phase in the alloy is refined and the solution Si is precipitated in the form of Al2Si2Y. Element B can promote Mn adsorption onto AlB2 to form borides. Under the compound modification of B and Y, Mn and Y elements are adsorbed by AlB2 to generate Al10Mn2Y adsorption layer. Moreover, surplus Y element can refine the eutectic silicon and iron-rich phases, further enhancing the electrical conductivity of the Mn-containing Al-7 Si-1 Fe alloys. With the melt holding time prolonging, the thickness of the Al10Mn2Y adsorption layer is increased. Modification effect on eutectic Si is weakened due to the Y content reduction in the melt, leading to the significant decrease of conductivity consequently.  
        关键词：Aluminum Alloy;Electrical Conductivity;Modification;Boron Treatment;Adsorption   
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      • Zheng Zhikai,Xiao Xiang,Wu Hao,Li Hongying,Chen Baoan,Ding Yi
        Vol. 42, Issue 1, Pages: 51-54(2022) DOI: 10.15980/j.tzzz.2022.01.010
        摘要：The effects of boronizing treatment（addition amount of B, boronizing temperature and holding time） on the impurity element content and conductivity of commercial purity aluminum were investigated. The results indicate that the conductivity of the alloy is improved to a certain extent by boronizing treatment on the industrial pure Al containing transition elements（Ti, V, Cr, Mn）>0.01%（mass fraction） with Al-3.04 B as intermediate alloy. B can react with transition elements to form blocky（Ti, V, Fe）B2 and flocculent（Ti, V, Fe, Zr）B2. Ti and V are deviated out of the solid solution state by boronizing treatment, resulting in the boride precipitation that finally deposits to the bottom of the furnace, thus significantly improving the melt purity and conductivity of the ingot. In addition, considering the property and cost of industrial pure aluminum, the optimal boronizing treatment process is as follows: the addition amount of boron of 0.015%～0.020%, the boronizing temperature of 760 ℃, and the holding time of 60 min, when the impurity element content of industrial pure aluminum is relatively low, and the electrical conductivity can reach 35.88 MS/m.  
        关键词：Boronizing Treatment;Electrical Conductivity;Boride;Impurity Element Content   
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        发布时间：2023-12-18
      • Wang Yifei,Zhang Yan,Wang Zhenxu,Chen Jingrun,Chen Dexu,Zhang Jing,Yang Shiyu
        Vol. 42, Issue 1, Pages: 55-59(2022) DOI: 10.15980/j.tzzz.2022.01.011
        摘要：The effects of recrystallization temperature（800, 900 and 1 100 ℃） on microstructure, mechanical properties and corrosion resistance of 60% rolled nitrogen interstitial solution high entropy alloy were investigated. The results indicate that the absence of phase structure change of the alloy can be observed after the recovery recrystallization heat treatment at different temperatures. With the increase of heat treatment temperature, the hardness of the alloy is decreased with the ductility increasing. When the temperature reaches 900 ℃, the grains are recrystallized, forming fine equiaxed grains with dispersive precipitation of second phases, where the alloy has the optimal corrosion resistance with positive self-corrosion potential and low current density.  
        关键词：Nitrogen Interstitial Solution;High Entropy Alloy;Recovery Recrystallization   
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        发布时间：2023-12-18
      • Qiu Qian,Wang Kelu,Li Xin,Wang Jun,Guo Wei,Wu Zehua
        Vol. 42, Issue 1, Pages: 59-63(2022) DOI: 10.15980/j.tzzz.2022.01.012
        摘要：The SP700 titanium alloy was subjected to an isothermal constant strain rate compression experiment on the Gleeble-3800 thermal simulation testing machine. Perform friction correction and temperature correction on the flow stress curve were conducted under the process parameters of the deformation temperature of 700～950 ℃ and the strain rate of 0.001～1 s-1, and the influence of friction effect and temperature effect on the flow stress of the material during the thermal compression experiment was analyzed. The results indicate that the friction correction coefficient is significantly affected by the deformation temperature and strain rate, of which the change law is not obvious yet. In addition, friction effect and temperature effect have significant effects on the thermal compression flow stress of SP700 titanium alloy with obvious rules, and the effect of friction is greater than that of temperature under the conditions of thermal deformation parameters.  
        关键词：SP700 Titanium Alloy;Flow Stress;Friction Effect;Temperature Effect   
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        发布时间：2023-12-18
      • Zhang Ju,Hu Xiaodong,Zhao Hongyang,Wang Zhenmin,Zhang Wanshun
        Vol. 42, Issue 1, Pages: 64-68(2022) DOI: 10.15980/j.tzzz.2022.01.013
        摘要：AZ series magnesium alloys sheet are widely used in automotive and aerospace industry, in which the morphology and quantity of main strengthening phase Mg17Al12 have important influence on the formability of the sheets. The rolled AZ31, AZ61 and AZ91 magnesium alloy sheets suffer annealing at 300 ℃ for 5 h, liquid nitrogen cryogenic treatment for 6 h at 160 ℃, aging at 160 ℃ for 18 h and different combination heat treatments. The results indicate that the main strengthening mechanisms of rolled AZ series magnesium alloys are solid solution and dislocation strengthening, which increases the strength with decrease of the plasticity. After annealing and cryogenic treatments, the second phases are less precipitated, and some large and slender grains are broken under the thermal stress of cryogenic treatment. The yield and strength ratio is decreased, and the strain hardening index is increased with the stable plasticity. After annealing and cryogenic as well as aging compound heat treatments, the strain hardening index is increased, and a large number of fine second phases are precipitated and dispersed at the grain boundaries and within grains, which is conducive to activate different slip systems during deformation and improves the uniform deformation ability and strength. The yield and strength ratio is further reduced accordingly, which is beneficial to the subsequent forming process of magnesium alloy sheets.  
        关键词：Magnesium Alloy;Cryogenic Treatment;Secondary Phase;Mechanical Properties;Yield and Strength Ratio   
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        发布时间：2023-12-18
      • Yuan Meiyi,Zhao Tiantian,Long Jiyin,Yang Yitao
        Vol. 42, Issue 1, Pages: 68-72(2022) DOI: 10.15980/j.tzzz.2022.01.014
        摘要：As-cast Cr17 stainless steel containing niobium was homogenized and annealed at 1 100 ℃ for 2 h.After water quenching at 1 000, 1 050 and 1 100 ℃ for 30 min, solution treatment was carried out. Some specimens were aged at 700 ℃ for 1 h. The microstructure, hardness and mechanical properties of the as-cast Cr17 stainless steel were analyzed, and the optimal scheme was selected to investigate microstructure evolution. The results reveal that the comprehensive properties at 1 050 ℃ are desirable. The microstructure of solution treated steel containing niobiumis is composed of ferrite and trace TiN. After aging treatment, σ phase is precipitated and the content carbide is decreased.  
        关键词：Ferritic Stainless Steel;Heat Treatment Process;Microstructure;Mechanical Properties;σ Phase   
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        发布时间：2023-12-18
      • Guo Wei,Hong Zhiyuan,Chen Yan,Song Hongwu,Wang Kelu,Zhang Shihong,Wang Jun
        Vol. 42, Issue 1, Pages: 73-77(2022) DOI: 10.15980/j.tzzz.2022.01.015
        摘要：Cu-2 Ag alloy rod billet with a diameter of 15 mm was fabricated by vacuum continuous down-drawing casting and electromagnetic stirring process. The influence law of electromagnetic stirring on microstructure and Vickers hardness of Cu-2 Ag alloy under different parameters were investigated. The results indicate that the grain size of the solidification microstructure of the alloy is decreased gradually with the increase of stirring frequency.The refinement effect of the alloy structure is desirable under the current of 280 A, and the hardness of alloy is changed obviously with frequency. Compared with that at the drawing speed of 6 mm/min, the Vickers hardness of the alloy specimen is increased at the drawing speed of 4 mm/min. Under different drawing speeds and current intensities, the Vickers hardness reaches the maximum when the stirring frequency is 50 Hz.  
        关键词：Electromagnetic Stirring;Cu-Ag Alloy;Solidification Structure;Hardness   
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        发布时间：2023-12-18
      • Ye Zhen,Zheng Changqing,Ge Sujing,Lu Yuanyuan,Zhang Shaowen,Miao Sainan,Liu Yongchang,Zhou Yawei,Ma Chaoli
        Vol. 42, Issue 1, Pages: 77-82(2022) DOI: 10.15980/j.tzzz.2022.01.016
        摘要：The ultra-purification treatment technology developed on the basis of advanced inclusion identification and analysis methods for aluminum（Al） melt can effectively remove the inclusions in the recycled Al melt and improve the melt quality. The microalloying technology by doping small amounts of rare earth（RE）, Zr, Cr, Mn and Sr elements can modify the microstructure and improve the mechanical properties of the recycled Al alloys. The performance of cast wheels containing various contents of recycled Al before and after ultra-purification treatment and microalloying was systematically compared. The results reveal that the performance of wheels made by recycled Al have little difference from those made by regular electrolytic Al, satisfying the product requirement of commercial wheels.  
        关键词：Recycled Aluminum;Inclusion Analysis;Ultra-purification Treatment;Microalloying   
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      • Lin Shaoyi
        Vol. 42, Issue 1, Pages: 83-86(2022) DOI: 10.15980/j.tzzz.2022.01.017
        摘要：The semi-solid rheomolding AZ91 D auto tire active safety device parts were prepared. The effects of severe rolling friction on the surface layer microcracks of the semi-solid rheomolding AZ91 D auto parts were investigated by “the fatigue experiment”, “25 000 km road test of cars equipping with the sample parts”, and “50 km road test of cars after sudden deflation of their tires”. The results indicate that according to the formation mechanism, the microcracks in the surface layer can be divided into plastic strain initiation microcrack and fatigue microcrack. The key factor is that severe rolling friction could cause the increase of temperature of the parts sharply and the plasticity of the parts, and the part can be subjected to great external load, leading to local violent plastic strain incongruity to generate microcracks. The microcracks in the surface layer with a distance more than 20 μm from the surface, is mainly distributed as micro-crack group, where most of the microcracks are non-propagation microcrack with the length less than 33 μm. The whole microcrack in plastic state is the key factor for the formation of the non-propagation microcracks in the surface layer.  
        关键词：Friction;AZ91D Magnesium Alloy;Semi-solid Rheomolding;Auto Part;Non-propagation Crack   
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        发布时间：2023-12-18
      • Peng Huiquan,Cai Changchun,Yu Huan,Xu Zhifeng,Wan Zhenjun,Lan Zeyu
        Vol. 42, Issue 1, Pages: 87-92(2022) DOI: 10.15980/j.tzzz.2022.01.018
        摘要：The three-dimensional orthogonal M40 J/Al composites with 50%（volume fraction） fiber were prepared by vacuum pressure infiltration with ZL301 alloy as the matrix and perform made of M40 J carbon fiber woven into three-dimensional orthogonal structure. The microstructure and fracture morphology of the composites were analyzed by SEM. The effects of notch position on the longitudinal tensile properties of the three-dimensional orthogonal M40 J/Al composites were investigated, and the failure mechanism was discussed. The results indicate that the tensile strengths of the composites with V-notch, rectangular notch and central circular hole notch at room temperature are 690.7、667.0 and 314.2 MPa, respectively, which are 9.24%, 12.35% and 58.71% lower than those of the unnotched specimens（761.0 MPa）. The internal notch has the greatest effect on the tensile properties of M40 J/Al composites with three-dimensional orthogonal woven structure compared to the external notch. The fracture location of composites containing the central circular hole notch is concentrated at the notch, which is extremely sensitive to the central circular hole notch with the lowest tensile strength compared to the other three types of composites.  
        关键词：Notch Location;Three-dimensional Orthogonal M40J/Al Composite;Vacuum Pressure Immersion;Tensile Failure   
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        发布时间：2023-12-18
      • Guo Bingxin,Dong Yuan,Wang Yu,Hou Fumin,Mao Hongkui,Xu Hong,Zhang Wenda,Hou Jianbing,Zhao Qiangsheng
        Vol. 42, Issue 1, Pages: 93-99(2022) DOI: 10.15980/j.tzzz.2022.01.019
        摘要：In order to improve the bonding strength of the steel/aluminum composite interface, the steel matrix with a large number of convex structures was utilized, which was prepared by sand casting after different pretreatments of plating aid, plating aid + hot dip on the surface of steel substrate. The effects of different surface pretreatment on the microstructure and mechanical properties of steel/aluminum composite interface were investigated. The results indicate that there are a lot of crevices at the interface between steel and aluminum without hot-dip treatment. The interface bonding mode is characterized by mechanical bonding with the poor bonding effect, and the interface shear strength is 9.6 MPa. After the hot-dip treatment of steel matrix, metallurgical bonding occurs at the interface between steel and aluminum, forming intermetallic compound layer composed of Fe2Al5 phase, Al8Fe2Si phase and Al4.5FeSi phase. The thickness of intermetallic compound layer at the convex and the straight interface of steel matrix is 35.3 μm and 29.4 μm, respectively, and the interfacial shear strength reaches 48.7 MPa.  
        关键词：Steel/Aluminum;Surface Pretreatment;Intermetallic Compounds;Bonding Strength   
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        发布时间：2023-12-18
      • Wang Jincai,Huo Xiaoyang,Li Lei,Fan Beibei,Mi Guofa
        Vol. 42, Issue 1, Pages: 99-103(2022) DOI: 10.15980/j.tzzz.2022.01.020
        摘要：A layer of nickel-based superalloy Inconel625 was cladded on the surface of the water wall steel plate of waste incineration boiler by laser additive remanufacturing to fabricate 20 G/Inconel625 composite. The effects of laser power on the dilution rate, macroscopic morphology, microstructure and hardness of Inconel625 alloy composite layer were investigated. The results indicate that with the power of the bottom layer and the surface layer of 5 000 W, the scanning speed of 5 000 mm/min, the powder feeding rate of 40.3 g/min, and the lap rate of 60%, the Fe dilution rate of the composite layer is less than 5%, and the surface is smooth with absence of pores. The structure of bonding zone in the composite layer is characterized by cellular dendrite and secondary dendrites, while that of interlayer remelting zone is columnar grain, which is surrounded by network secondary dendrites, and that of primary melting zone in the surface layer presents equiaxed grain.  
        关键词：Laser Additive Remanufacturing;Water Wall;Microstructure;Dilution Rate;Pore   
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        发布时间：2023-12-18
      • Shi Shang,Liu Fenggang,Huang Chunping,Shu Zongfu
        Vol. 42, Issue 1, Pages: 104-109(2022) DOI: 10.15980/j.tzzz.2022.01.021
        摘要：Three-dimensional solid parts were prepared through multiple laps and multi layer accumulation of a single cladding layer. Single-pass 1-layer, single-pass 2-layer, and single-pass 5-layer deposition specimens of 34 CrNiMo6 steel were prepared by laser solid forming technology, and the process parameters of laser solid forming 34 CrNiMo6 steel were investigated with laser power, scanning speed and powder feeding rate as control variables and deposition layer thickness or cross-sectional area as reference indicators. The results indicate that through orthogonal and range analysis of the influence of the process parameters on the reference index, it is found that the factors of process parameters are in the order as follows: scanning rate>powder feeding rate>laser power. The optimal process parameter obtained by the orthogonal experiment is laser power of 2 800 W, scanning rate of 600 mm/min, and powder feeding rate of 15 g/min. With the increase in the number of deposited layers, thickness of the single-layer cladding deposited layer is gradually increased in the range of 0.125～0.156 mm. The maximum hardness of the heat-affected zone obtained by the single-pass 1-layer deposition specimen under different process parameters have obviously differences.In the single-pass 5-layer deposition specimen, the surface hardness of the deposition layer is higher than that of the heat-affected zone near the substrate.  
        关键词：Laser Solid Forming;34CrNiMo6 Steel;Orthogonal Experiment;Parameter Optimization   
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        发布时间：2023-12-18
      • Zhang Zhenglai,Zhang Taixin,Zhao Guotian,Ling Zhiyuan,Liu Jifeng,Zu Wenjie,Yang Yucheng,Cai Chaoxin,Su Ting,Wang Lin,Deng Jihua,Ye Ting
        Vol. 42, Issue 1, Pages: 109-111(2022) DOI: 10.15980/j.tzzz.2022.01.022
        摘要：The accumulator housing has a large bearing capacity, complex structure with the wall thickness difference more than 10 mm, and the casting blowhole must be controlled within 0.2 mm. The sequential extrusion die casting process was adopted to reasonably design the die casting feed, exhaust system and cooling system to solve the casting blowhole problem and enhance the bearing capacity of the accumulator housing.  
        关键词：Accumulator Housing;Extrusion Process;Die Casting Die   
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        发布时间：2023-12-18
      • Huang Li,Gao Yanli,Liu Chongzheng,Wang Hailong,Du Xuchu
        Vol. 42, Issue 1, Pages: 112-115(2022) DOI: 10.15980/j.tzzz.2022.01.023
        摘要：ZL105 A rocker arm shell casting was fabricated by low pressure casting. According to the structural characteristics and performance requirements for ZL105 A alloy and the casting, the optimization of ZL105 A alloy was carried out from the aspects of melt refining, alloying, casting process design and ProCAST numerical simulation, and the key points for casting process of rocker arm shell castings were analyzed. The results indicate that the comprehensive mechanical properties of ZL105 A alloy can be effectively improved by compound refining of hexachloroethane and argon rotary injection, combined with Be alloying. The low-pressure sand casting process, combined with bottom pouring+slot gating system and the method of placing cold iron on thick and large parts were adopted to obtain rocker arm shell casting with desirable internal quality, where the mechanical properties of the casting body can reach up to σb≥318 MPa, σ0. 2≥261 MPa, δ5≥5.6%, respectively, and body fatigue performance, internal quality and dimension meet the designing index requirements.  
        关键词：ZL105A;Rocker Arm Shell Casting;Numerical Simulation;Low Pressure Casting   
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      • Chen Sitao
        Vol. 42, Issue 1, Pages: 116-118(2022) DOI: 10.15980/j.tzzz.2022.01.024
        摘要：By designing a vacuum extraction system with main and secondary exhaust pipes, and combining with the Flow-3 D simulation software, the vacuum die casting of magnesium alloy radiator was carried out. The results show that the vacuum die casting of magnesium alloy with complete appearance and compact structure can be obtained by using the vacuum pumping system. By adjusting the position of the inductor, different cavity vacuum degrees can be achieved. The filling capacity of magnesium alloy can be improved effectively by increasing the vacuum degree of mold cavity, and the porosity or shrinkage defects in die castings can be eliminated.When the cavity vacuum is 10 kPa, the air volume of the magnesium alloy radiator die casting is the least, and the tensile strength and elongation of the die casting are improved correspondingly.  
        关键词：Vacuum Degree;Air Entrained Simulation;Vacuum Die Casting   
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        发布时间：2023-12-18
      • Zhao Lihong,Bi Tao
        Vol. 42, Issue 1, Pages: 119-121(2022) DOI: 10.15980/j.tzzz.2022.01.025
        摘要：Combined with the finite element simulation model to analyze the reasons for the fracture of the casting aluminum rim, and optimize the rim structure, a solution to increase the bottom angle of the groove and wall thickness of partial rim was proposed. The scheme verifies that wheels can pass the 90° impact test with a falling height of 150 mm, and solve the problems of rim cracking during the use of the product, providing reference for the inchoate design and development of aluminum wheels.  
        关键词：Aluminum Wheel;Rim Fracture;90° Impact Test;Finite Element Analysis   
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      • Zhu Changhong
        Vol. 42, Issue 1, Pages: 122-125(2022) DOI: 10.15980/j.tzzz.2022.01.026
        摘要：The die casting die structure, die flow analysis, production process control and other aspects were nalyzed to solve defects of die castings such as shrinkage and surface catched casting that result in leakage. Practice shows that the method can effectively reduce the leakage risk of die casting aluminum parts and improve the internal quality of die casting aluminum parts  
        关键词：Die Structure;Die Flow Analysis;Shrinkage Cavity;Surface Catched Casting;Leakage   
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        发布时间：2023-12-18
      • Li Bobo,Cheng Yazhen,Yang Guang,Qiao Haibin,Liu Yinqi,Yang Xuedong
        Vol. 42, Issue 1, Pages: 125-128(2022) DOI: 10.15980/j.tzzz.2022.01.027
        摘要：Domestic titanium and titanium alloy castings are mainly produced by machined graphite and investment precision casting. However, the actual production process can hardly meet the requirement of high quality, low cost and short delivery time subject to technical limitations. Therefore, it is necessary to promote research and application of new casting technology to form a complement with the existing technologies. Lost foam casting has superior advantages, which has been widely used in metal castings such as steel, aluminum, etc., while rarely reported in titanium alloys. The advantages, technology schemes and application prospects of titanium alloy lost foam cladding casting were mainly introduced.  
        关键词：Titanium Alloy;Casting;Lost Foam   
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        发布时间：2023-12-18
      • Yang Yiqun,Li Junyi,Wang Dongxin,Liu Zhaogang,Xie Yao
        Vol. 42, Issue 1, Pages: 129-132(2022) DOI: 10.15980/j.tzzz.2022.01.028
        摘要：Taking the Be-Al alloy bracket of a certain aerospace satellite as the research object, the precision casting process was designed. The filling and solidification process of the casting was simulated by CAE software to predict the shrinkage cavity and shrinkage defect area, and the origination of the defects were analyzed. By adding air duct and setting up local feeding passage, controlling the preheating temperature and pouring temperature of the shell, cracks and cold insulation defects can be eliminated and the shrinkage defects can be reduced. The results indicate that when the preheating temperature of the shell is 775 ℃ and the pouring temperature is 1 300 ℃, the quality of the castings is desirable with absence of obvious defects. The tensile strength, yield strength and elongation of the castings in as-cast state are 248.6 MPa, 191.8 MPa and 2.10%, respectively, meeting the requirements.  
        关键词：Bracket;Be-Al Alloy;Casting Defects   
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      • Vol. 42, Issue 1, Pages: 133(2022)
        摘要：<正>经协会六届常务理事会第六次会议讨论,协会现定于2022年2月25～26日在苏州召开"苏州市压铸技术协会六届理事会第三次年会暨2021中外压铸技术交流会",诚邀协会各理事、会员、专家莅临参加,也欢迎压铸界新老朋友共聚、交流!具体内容如下:一、主题:技术引领、服务行业二、时间:2022年2月25～26日三、地点:苏州高铁金科大酒店（苏州市高铁新城南天城路67号—高铁北站对面）  
          
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        发布时间：2023-12-18
      • Vol. 42, Issue 1, Pages: 134(2022)
        摘要：<正>近年来,全球经济格局正在发生深刻的变化,随着"双碳"经济新模式的开启,汽车轻量化方兴未艾!而以高真空压铸为基础的大型薄壁铸件一体化压铸技术以及面向中、厚壁铝合金铸件解决方案的挤压铸造技术在新能源汽车上的轻量化战略中愈显重要!铝、镁合金压铸件在新能源汽车市场的渗透率在不断提高,使人们重新认识和定义"压铸",压铸行业也迎来了空前的机遇与挑战。压铸是什么?压铸能做什么?压铸企业该如何做好定位?形成核心竞争力,以适应复杂的环境与形势,  
          
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        发布时间：2023-12-18
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