最新刊期
      卷 35 ， 期 4 ， 2015
      • Pu Zhijun,Zhang Kui,Lai Lin,Shi Guoliang
        Vol. 35, Issue 4, Pages: 337-341(2015) DOI: 10.15980/j.tzzz.2015.04.001
        摘要：The as-cast microstructure and homogenization treatment of semi-continuous casting AZ40 ingot with a diameter of 500 mm were investigated.Dendrites and compounds in the center of ingot are coarser than those in the outer.In as-cast microstructure,Al enrichment zones with Al content of about2.62% exist at the edges of dendrites,however,the Al content in the center of dendrites is only about0.59%,and other Al atoms are used to form Mg17Al12 and Al-Mn compounds.Zn and Mn atoms are uniformly dissolved into dendrites,and Mn atoms are used to generate Al-Mn particles,and Zn atoms tend to enrich at Mg17Al12 particles.During homogenization treatment,Mg17Al12 can easily be re-dissolved into matrix,however,it is difficult for Al enrichment zones to uniformly diffuse from edges to centers.With homogenization treatment at 410 ℃ for 4h,eutectoids in the matrix are re-dissolved basically,while Al-enrichment zones can not be re-dissolved effectively.After homogenization treatment at 410℃for 24 h,Al enrichment zones are totally re-dissolved in the matrix with uniformly distributed Al content,and the Al content in most parts of matrix is approximately 4.02%.  
        关键词：AZ40 Magnesium Alloy;Semi-continuous Casting;As-cast Microstructure;Homogenization   
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      • Wang Zhihu,Zhang Jumei,Chen Zishan
        Vol. 35, Issue 4, Pages: 341-344(2015) DOI: 10.15980/j.tzzz.2015.04.002
        摘要：Effects of solution and multiplicity solution treatment on microstructure and mechanical properties of AZ91 magnesium alloy after aging treatment were investigated by OM（optical microscopy）,SEM（scanning electron microscopy）,XRD（X-ray diffraction）as well as hardness and tensile tests.The results indicate that the distribution of Al atoms inα-Mg is more uniform after multiplicity treatment,and the concentration difference is only 0.64 % between the grain boundary and the grain center.At the same time,the mechanical properties of AZ91 magnesium alloy after multiplicity heat treatment exhibit more satisfactory.Compared with those of the as-cast alloy,the hardness,the tensile strength and yield strength are increased by 34%,25% and by 55%,respectively,meanwhile,the decrease of elongation can be ignored,which is related with the morphology ofβ-Mg17Al12 precipitation during the aging treatment.  
        关键词：AZ91Magnesium Alloy;β-Mg17Al12Phase;Solid Solution and Aging Treatment   
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      • Vol. 35, Issue 4, Pages: 344(2015)
        摘要：<正>凯斯曼秦皇岛汽车零部件制造有限公司（简称为秦皇岛凯斯曼）年产157万件压铸气缸头盖、65万件差压铸造转向节支架项目开工建设。据悉,新项目总投资4.73亿元人民币,将陆续建设总建筑面积达5.66万平方米的熔炼车间、压铸车间、差压铸  
          
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      • Vol. 35, Issue 4, Pages: 356(2015)
        摘要：<正>山东裕航特种合金装备有限公司生产的铝合金导电轨产品自问世以来,凭借高强度、导电性能优异、质量轻、较好的耐腐蚀及耐磨性、安装简便等优势,在业内备受关注,受到了客户的好评。  
          
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      • Vol. 35, Issue 4, Pages: 364(2015)
        摘要：<正>安泰科技股份有限公司（"安泰科技"）出资2亿元人民币入股深圳市长盈精密技术股份有限公司（"长盈精密"）。安泰科技发布公告称,其已于近日以自有资金不超过2亿元参与认购长盈精密定增募投项目,后者定增项目为扩产"金属CNC结构组件项目"和"智能终端超精密连接器项目"。据悉,这只是该定增项目募集资金的一部分,长盈精密此次募集资金为  
          
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      • Vol. 35, Issue 4, Pages: 389(2015)
        摘要：<正>随着全球铸造业的发展,铸件的需求量也在不断增加。由于近年来很多汽车厂商采用铝铸件代替灰铁铸件,使铝铸件的需求量不断提高。我国氧化铝、电解铝产量均为世界第一,并拥有丰富的劳动力资源以及巨大的市场。这为我国铝合金压铸件行业  
          
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      • Vol. 35, Issue 4, Pages: 400(2015)
        摘要：<正>南宁源正全铝车身新能源汽车生产基地项目于2015年2月28日举行开工仪式,项目占地2 000亩,位于南宁市邕宁区新兴产业园区,计划总投资48亿元人民币。项目建成达产后,将实现年产值22亿元。  
          
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      • Vol. 35, Issue 4, Pages: 410(2015)
        摘要：<正>春兴精工为国内精密铝合金结构件最具研发实力与规模生产能力的专业服务商之一。主要从事通讯系统设备、汽车等精密铝合金结构件的制造、销售及服务;通讯系统设备、汽车等精密铝合金结构件的研究与开发等业务。公司具有丰富的铝合金压铸、精密机械加工、钣金冲压制造经  
          
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      • Vol. 35, Issue 4, Pages: 433(2015)
        摘要：<正>金属空气电池具有原材料丰富、安全环保、能量密度高等一系列优点,被称为"面向21世纪的新型绿色能源",具有良好的发展和应用前景。金属空气电池的阳极为活泼金属（如Mg、Al与Zn等）,放电时金属M被氧化成相应的金属离子M+;电解液为  
          
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      • Vol. 35, Issue 4, Pages: 436(2015)
        摘要：<正>浙江万丰奥威汽轮股份有限公司（"万丰奥威"）发起定增预案,募集资金不超过17.5亿元,其中不超过13.5亿元用于收购Wanfeng MLTH Holdings Co.,Ltd（简称"万丰镁瑞丁"）100%股权。万丰奥威表示,通过本次非公开发行股票募集资金收  
          
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      • Vol. 35, Issue 4, Pages: 443(2015)
        摘要：<正>中国铝业3月26日公布2014年度报告。2014年亏损162.16亿元,再次问鼎A股"亏损王"。其于2009年亏损46亿元、2012年亏损82亿元就曾创下亏损记录。2014年,中国铝业实现营业收入1 417.72亿元,同比下降18.07%。  
          
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      • Zheng Damin,Wei Kuixian,Ma Wenhui,Dai Yongnian
        Vol. 35, Issue 4, Pages: 345-347(2015) DOI: 10.15980/j.tzzz.2015.04.003
        摘要：Aluminum is one of the main impurity elements in silicon.The method of removing aluminum contained in silicon by vacuum directional solidification has been widely applied for industrial polycrystalline silicon purification.The purification experiment was conducted in a 500 kg ingot furnace used in industrial production with the raw material of silicon whose purity and aluminum content were 99.98%and 1.54×10-6,respectively.The experimental results demonstrate that the aluminum removal effect exhibits obvious,where the aluminum content can be reduced to a lowest value of 2.8×10-8,and a removal efficiency of 98.2% can be reached.After analyzing the process of aluminum removal,it is considered that in the process of purification experiment by employing ingot furnace,the removal of aluminum impurity is mainly completed under the co-action of dephlegmation mechanism in the process of directional solidification purification and vacuum volatilization mechanism  
        关键词：Vacuum Directional Solidification;Casting Furnace;Purification;Impurity Aluminum   
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      • Li Haidong,Qi Zhengfeng
        Vol. 35, Issue 4, Pages: 348-351(2015) DOI: 10.15980/j.tzzz.2015.04.004
        摘要：Effects of quenching temperature and tempering temperature on 42 CrMo cold working die steel were investigated by tensile testing,impacting testing,hardness measurement and microstructure observation.The results show that,with tempering at 200 ℃,with the increase of quenching temperature,the tensile strength is increased firstly and then decreased,while,elongation,section shrinkage and impact power are decreased.With tempering at 600 ℃,with the increase of quenching temperature,the tensile strength of die steel is reduced lightly ahead of 1 040℃,while the elongation,section shrinkage,impact and hardness are decreased.After 200 ℃tempering,the strength of the steel mold meet the requirements,however,the elongation and impact power energy are lower than the standard requirements.After tempering at 600 ℃,the strength,plasticity and toughness meet the requirements of cold work die steel substrate.  
        关键词：Die Steel;Quenching;Low Temperature Tempering;High Temperature Tempering   
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      • Hou Liqun,Xing Zhiyuan,Qiao Xiaomeng,Jia Jianping,Hao Hai,Zhang Haijun
        Vol. 35, Issue 4, Pages: 351-353(2015) DOI: 10.15980/j.tzzz.2015.04.005
        摘要：On the basis of structure and processing analysis,the aluminum alloy wheel-hub was produced by squeeze casting with floating female mould in order to solve the problems such as shrinkage cavity and porosity occurred in hot spot at the aluminum alloy wheel-hub.The results show that the aluminum alloy wheel-hub produced by squeeze casting with floating female mould is free of the defects of shrinkage cavity and porosity.  
        关键词：Aluminum Alloy Wheel-hub;Floating Female Mould;Squeeze Casting   
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      • Zhang Zhongcheng,Zhang Fengxia,Qin Sen,Wang Zhongmin,Liu Ning,Liu Yu
        Vol. 35, Issue 4, Pages: 354-356(2015) DOI: 10.15980/j.tzzz.2015.04.006
        摘要：Effects of NbC,VC particle additions on KMTBCr20 cast iron for pump were investigated.Experimental results show that the added particles can inhibit the grain growth and significantly refine microstructure and improve the mechanical properties of the cast iron.With adding 0.1%VC,carbides are refined and blunted,which takes the cast iron high hardness and toughness.The hardness（HRC）and impact toughness（αk）of the cast iron with adding VC particles are increased by 14.5% and by 92.5%,respectively,compared with that without particles addition.Product assessment shows that the service life caused by failure（fracture and wear）is improved,and working time is increased from 2 800hto4 200 hunder the coal washing condition.  
        关键词：Wear Resistant White Cast Iron for Pump;NbC and VC Modification;Microstructure   
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      • Wu Chao,Shen Minggang,Zhang Dehui
        Vol. 35, Issue 4, Pages: 357-359(2015) DOI: 10.15980/j.tzzz.2015.04.007
        摘要：The mathematical model of the flow field of 100 t bottom-blowing argon ladle with immersed cylinder was established to simulate the single-hole blowing argon process using the mixture multiphase flow model.Effects of diameters,inserting depth of immersed cylinder and gas flow rate on liquid steel flow state and ampilitude of liquid steel level were analyzed.Results show that liquid level fluctuation can be limited by altering diameters and inserting depths of immersed cylinder,which can enlarge the flow rate of bottom-blowing gas and improve the flow of the molten steel in the ladle by increasing the gas flow rate.  
        关键词：Ladle;Bottom Stirring;Immersed Cylinder;Slag Entrapment   
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      • Wang Long,Sun Binyu,Chen Shuaizhang,Cui Pengpeng
        Vol. 35, Issue 4, Pages: 360-364(2015) DOI: 10.15980/j.tzzz.2015.04.008
        摘要：The temperature field in cast-rolling area of the AZ31 magnesium alloy was simulated using the computer fluid software ANSYS Fluent,which is based on the conditions that the molten alloy of castrolling area is the same continuum,roll casting process is steady and the melt is incompressible.The three dimensional temperature field distribution of cast-rolling area of the AZ31 magnesium alloy strip cast-rolling,were investigated,with different process parameters,such as pouring temperature,roll casting speed and cooling water flow rate and effects of the temperature field distribution on the stability of strip cast-rolling process were presented.By comparing and analyzing simulation results,the optimum process in the selection range can be presented as follows:pouring temperature of 853 K,rolling casting speed of 9m/min,cooling water flow rate of 3m/s.  
        关键词：AZ31Alloy;Twin-roll Casting;Three-dimensional Temperature Filed;Process Parameters   
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      • Xu Ting,Zhang Lihua,Li Xiaoqian,Chen Pinghu,Tang Jia
        Vol. 35, Issue 4, Pages: 365-369(2015) DOI: 10.15980/j.tzzz.2015.04.009
        摘要：Based on numerical simulation of fluid-thermal coupling field of a one-strand slab tundish,the average residence time of liquid steel was analyzed at different slab casting speeds,and under static magnetic fields with different intensity,the liquid steel flow was also investigated according to the electromagnetic hydrodynamics（MHD）.The results show that both reasonable lower casting speed and the stronger magnetic field can postpone the average staying time of the liquid steel.With the action of the electromagnetic force which is in contrast to the velocity of the liquid steel,the distribution of the flow field is changed,thus reducing the impaction to the tundish wall,so the upper surface of the molten steel can be flown more smoothly,however,the decrease of temperature of the steel is slight.The average temperature at the outlet is decreased by 0.46 K when the magnetic intensity is 0.10 T.Through changing magnetic field intensity,it is found that the combined effect exhibits desirable in the range of0.100.15 T.  
        关键词：Tundish;Electromagnetic Field;Temperature Field;Fluid Field;Numerical Simulation   
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      • Vol. 35, Issue 4, Pages: 364(2015)
        摘要：<正>据韩国媒体Electronic Times报道,韩国金属镁零部件制造商SK zircon公司近日成功采用压出方式批量生产镁合金铸件产品,主要用于LED照明的散热片,以及电动汽车领域。由于镁合金加工难度高,普遍采用压铸和压延等方式进行生产,压出方面还未实现批量生产,或者采用该工艺生产的应用局  
          
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      • Vol. 35, Issue 4, Pages: 379(2015)
        摘要：<正>据韩媒Electronic Times近日的报道称,韩国本土企业永信金属株式会社成功开发出超薄型镁板材产品,有望作为高级喇叭振动膜,及放热、屏蔽电子波的IT专用材料。镁材质量轻、强度高,广泛应用于IT、仪器等行业,但由于易破损,因此很难加工成较薄的产品。韩国大多数企业主要采取  
          
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      • Vol. 35, Issue 4, Pages: 394(2015)
        摘要：<正>由德国最大的铝铸造企业汉特曼公司投资7 500万欧元（约合5亿元人民币）的汉特曼轻金属铸造（天津）有限公司,于2015年3月12日在天津空港经济区正式投产,主要为大众汽车配套生产变速箱壳体以及离合器壳体。  
          
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      • He Zhijian,Li Lu,Zhou Rongfeng,Jiang Yehua,Zhou Rong
        Vol. 35, Issue 4, Pages: 369-372(2015) DOI: 10.15980/j.tzzz.2015.04.010
        摘要：A new type of semi-solid processing method that was electromagnetic stirring with rotating-rod induced nucleation（ES-RRIN）was used to fabricate semi-solid slurry of hypereutectic Al-25 Si alloy.Effects of rotating speed and stirring current on primary Si particles（PSPs）in hypereutectic Al-25 Si alloy were investigated.The results reveal that the size of PSPs is coarsen with agglomeration to some extent at a higher or lower rotating speed and current.The primary Si size reaches approximately 25μm with spherodization and uniform distribution at 500r/min and 25 A.  
        关键词：Electromagnetic Stirring;Rotating-rod Induced Nucleation;Al-25Si Alloy;Semi-solid Micro-structures   
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      • Ding Supei,Shi Xueqian,Zhu Liang,Sun Yuxia,Kang Jingle,Tian Xuelei
        Vol. 35, Issue 4, Pages: 373-376(2015) DOI: 10.15980/j.tzzz.2015.04.011
        摘要：Research and development of sand mould low pressure casting equipment and technology for two kinds of aluminum alloy components were introduced such as large thin-walled pressure-resistant aluminum alloy housing and subjected components for automobile.It is pointed out that the green,environmental-friendly and sustainable idea can promote the rise of new casting technology,and development of sand mould low pressure casting equipment and technology are driven obviously by the large direction of thin-walled pressure-resistant aluminum alloy housing and wide application of high strength aluminum alloy parts for automobile.  
        关键词：Aluminum Alloy;Sand Mold;Low-pressure Casting;Equipment and Technology;Research and Development   
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      • Zhang Meijuan,Ju Zhongqiang,Gao Fuhui,Qie Xiwang,Nan Hai
        Vol. 35, Issue 4, Pages: 376-379(2015) DOI: 10.15980/j.tzzz.2015.04.012
        摘要：The change of domestic application for patent in Ti alloy and TiAl alloy in nearly 30 years was expounded.Patent distribution of companies,institutes and universities in aviation industry for Ti alloy,TiAl alloy,containing with core and shell used for precision casting,was analyzed.Based on the trendency of patent layout in related technologies abroad and the development of domestic technologies,countermeasures of strengthening domestic patent work and technology innovation in aviation industry were presented,and the patent layout in Ti alloy for aviation industry was prospected.  
        关键词：Ti Alloy;Aviation Industry;Patent;Countermeasure   
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      • Chen Yun,Xiong Xinhong,Du Yanying,Luo Jixiang,Tao Zhengfeng
        Vol. 35, Issue 4, Pages: 380-383(2015) DOI: 10.15980/j.tzzz.2015.04.013
        摘要：Microstructure and mechanical properties of squeeze casting AZ91 Dalloy under different heat treatment conditions were investigated,and effects of wall thickness on mechanical properties were also discussed.The results show that microstructure of squeeze casting AZ91 Dalloy consists of primaryα-Mg matrix andβ-Mg17Al12 phase which is mainly present in the matrix and grain boundaries.Single phaseα-Mg solid solution is observed after solid solution treatment,and a few granular precipitates are distributed insideα-Mg matrix.After solid solution aging treatment,β-Mg17Al12 phase is distributed at insideα-Mg matrix and grain boundaries again.Moreover,theβ-Mg17Al12 phase is present in form of finer particles.The hardness,yield strength and tensile strength of squeeze casting AZ91 Dalloy are decreased while elongation is increased with the increase of wall thickness.  
        关键词：Squeeze Casting;Magnesium Alloy;Microstructure;Mechanical Properties   
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      • Shen Zaiping,Wu Yifeng,Li Zhongjie
        Vol. 35, Issue 4, Pages: 384-387(2015) DOI: 10.15980/j.tzzz.2015.04.014
        摘要：To solve the problem of remote control of the cold chamber die casting machine,a remote monitoring system for cold chamber die casting machine was developed based on WinCC Web Navigator.WinCC Web Navigator"thin Client"system was used to remote control and monitor multiple die casting machines’ HMI and production data in the workshop.The result shows that this system can help the enterprise not only realize the integration of management and control,but also achieve the information integration of the company.And therefore the quality of castings and the efficiency of production were improved.  
        关键词：Cold Chamber Die Casting Machine;WinCC Web Navigator;Remote Monitor;Integration of Management and Control   
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        发布时间：2023-12-18
      • Dai Xikui,Xie Shuzhong,Jiang Xiannian,Mao Sui,Yong Jianqiang,Wang Xiaoyi
        Vol. 35, Issue 4, Pages: 387-389(2015) DOI: 10.15980/j.tzzz.2015.04.015
        摘要：Aluminum alloy oil pan was produced by die-casting technology.Through analyzing structure and technology of oil pan and adopting rational processing layout and mould structure design,the possible defects in the oil pan can be eliminated effectively.The practical production verifies that the quality of oil pan is satisfid.  
        关键词：Oil Pan;Aluminum Alloy;Die-Casting;Processing Optimization   
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      • Zhao Jiahuan,You Dongdong,Wang Xiang
        Vol. 35, Issue 4, Pages: 390-392(2015) DOI: 10.15980/j.tzzz.2015.04.016
        摘要：Based on the lubrication numerical model,the load between the chamber and punch in the different gap was calculated,and then the friction characteristics were investigated at different loads and lubricants.The results show that,at the given load,the punch lubricant exhibits a satisfied lubricating properties,and the frictional coefficient between the friction pair is 0.16 with the very low change range.By using Mobil gear oil,with the load increases,the friction coefficient is changed from 0.43to0.07 due to the good lubricant films formed between the friction pair,and error between the experimental and numerical model is within 10%,verifying the experimental rationality.  
        关键词：Squeeze Casting;Injection Mechanism;Lubricating;Friction Characteristics   
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      • Zhang Jianguo,Wang Yongming,Sun Yanping,Chen Jiahui
        Vol. 35, Issue 4, Pages: 392-394(2015) DOI: 10.15980/j.tzzz.2015.04.017
        摘要：With development of aerospace engine,low pressure turbine blade was developed to tendency with more slender,thinner and longer.The detection for blade size was developed from only blade profile to profile degree,torsion and position degree.To meet new detecting requirement for blade profile,a new structural detecting tool was designed,which could realize the detection of profile degree,torsion and position degree.  
        关键词：Investment Casting;Near-net Shaping;Profile Degree;Position Degree;Torsion   
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      • Liao Xiaobo
        Vol. 35, Issue 4, Pages: 395-397(2015) DOI: 10.15980/j.tzzz.2015.04.018
        摘要：Aiming at crack easily occurred in investment castings during temperature increment process,the origination of crack during heat treatment process was analyzed.The results reveal that through adopting segment temperature increment and holding temperature to uniformly heating investment castings during heat treatment,the crack in investment castings during heating process can be eliminated.  
        关键词：Duplex Stainless Steel;Heat Treatment;Crack   
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        发布时间：2023-12-18
      • Wang Xinjie,Wang Wei
        Vol. 35, Issue 4, Pages: 397-400(2015) DOI: 10.15980/j.tzzz.2015.04.019
        摘要：By means of laser particle analyzer、rheological characteristic measurement instrument、room temperature & normal pressure contact angle instrument and high temperature contact angle instrument,some properties of the water base EPC coating for ZL101 Aand HT200castings were measured,such as refractory aggregate gradation and the corresponding volume density,the corresponding relationship between coating viscosity and stress with shear rate,the variation curve of the normal contact angle that the first dip process of the coating on EPS model surface and the normal contact angle which the second dip process of the coating on dry coating shell surface,the high temperature contact angle of liquid HT200 on dry coating layer shell at 0.011 Pa.By use of spectrum measurement instrument and scanning electron microscope,the changes of micro morphology and elements composition of coating before and after pouring were observed and analyzed comparatively.  
        关键词：Lost Foam Coating;Contact Angle;Rheological Property;Aggregate Gradation   
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        发布时间：2023-12-18
      • Huang Yuanjian,Dai Qiulian,Luo Canbin,You Fangyi
        Vol. 35, Issue 4, Pages: 401-405(2015) DOI: 10.15980/j.tzzz.2015.04.020
        摘要：Effects of different Ti and Mg addition as well as heat treatments on the microstructures and mechanical properties of Al-Cu alloys prepared by LFC process were investigated.The results show that the amount and grain size of the brittle phase are increased with the increase of Ti content from 0.3%to0.9% and 1.2%,respectively,which leads to the slight decrease of transverse rupture strength（TRS）of the alloys while the hardness almost keep constant with a lower value.The TRS and hardness of the alloys are almost double the original values after being heat treated by 535℃×4hsolution+70℃water quenching +175 ℃×4haging treatment.When 1.0% of Mg is added into the aluminum-copper alloy with 0.3% Ti,the TRS of the alloy is increased a little while its hardness is increased significantly.The amount of Mg is further increased to 1.5% and 2.0%,hardness of the alloys is continued to increase while the TRS is decreased slightly.The TRS and hardness of the alloys containing different amounts of Mg are increased obviously after being heat treated by 535 ℃×4hsolution+70 ℃ water quenching+175 ℃×4haging treatment,and the optimized result can be presented with 1.5% Mg addition.It is found that diamond grit coated with Ti or adding some amount of Ti into the aluminum-copper alloy can bring a stronger bonding between the metal bonds and diamond grits.  
        关键词：Lost Foam Casting;Heat Treatment;Al-based Matrix;Microstructures;Mechanical Properties   
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      • Wang Qiang,Yang Xingdong,Wang Shengbao
        Vol. 35, Issue 4, Pages: 406-408(2015) DOI: 10.15980/j.tzzz.2015.04.021
        摘要：The liner in crusher was analyzed,and the composition optimization design and modification were conducted.The gating system is enlarged running system containing several flat horn ingates and heat insulating riser with knock-off head,and negative pressure cast（EPC）process was adopted and a self-developed modifiers were used."Quenching & tempering"heat-treat process was conducted by strictly controlling quenching temperature,holding time and cooling rate.The mechanical properties and abrasion resistance of high manganese alloy were improved.This crusher liner has a good grain microstructure,density and quantity of carbide as well as good amount,shape,size and distribution of retained austenite,whoses mechanical properties and wear resistance are significantly better than those of commercial liner.  
        关键词：Wear-resistant Materialsm;High Manganese Alloys;Crusher Liner;Heat Treatment   
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        发布时间：2023-12-18
      • Zhao Jianbo,Sun Ping,Sun Yuxin,Liu Rongfei,Wang Nuanpeng,Wu Laidi
        Vol. 35, Issue 4, Pages: 408-410(2015) DOI: 10.15980/j.tzzz.2015.04.022
        摘要：Centrifugal casting process of ZG120Mn13 bushing was described.Centrifugal casting ZG120Mn13 bushing has the absence of shrinkage porosities（holes）,and the sound microstructure with grain size in range of 70130μm and grain size degree of 34level can be observed.And practical production shows that qualified rate,the cast productivity and production cost of centrifugal casting ZG120Mn13 bushing is increase by 35%,40% and is decreased by 26%,respectively.  
        关键词：Austenitic Manganese Steel;Centrifugal Casting;Bushing;Shrinkage Cavity;Grain Size   
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      • Wang Wenyan,Xu Kaihui,Wang Wenbin,Xie Jingpei,Yuan Yasha,Zhang Haoyin,Huang Wenjun,Shi Shiqin
        Vol. 35, Issue 4, Pages: 411-413(2015) DOI: 10.15980/j.tzzz.2015.04.023
        摘要：Aluminum alloy 6061 and 20TiC/6061 aluminum matrix composites were prepared by the microwave sintering,and microstructures and properties of the two materials prepared were investigated at different sintering temperatures.The results show that with the increase of sintering temperature,metallurgical bonding ability of aluminum alloy 6061 prepared by microwave sintering is improved,and microstructure and properties of the materials are also improved at the sintering temperature range,meanwhile,the final relative density reaches approximately 96%.With sintering at 560 ℃,fine reinforcement particles with sound bonding with matrix are uniformly distributed in the 20TiC/6061 composites.XRD analysis shows that only single Al phase exists in 6061 alloy,and matrix phase Al and reinforcement TiC exist in the composites with absence of other phases.  
        关键词：Microwave Sintering;AMCs;Sintering Temperature;Microstructure;Properties   
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        发布时间：2023-12-18
      • Jin Kunpeng,Lu Shiqiang,Deng Liping
        Vol. 35, Issue 4, Pages: 414-419(2015) DOI: 10.15980/j.tzzz.2015.04.024
        摘要：NbCr2alloy contained Laves phase is a kind of very potential advanced high temperature structural materials.Therefore,the exploration on high temperature mechanical properties of Laves phase NbCr2 alloy were reviewed,focusing on effects of the high temperature deformation mechanism,alloying,preparation technology and heat treatment process on the mechanical behavior of high temperature alloy.Finally,some suggestion was presented on the problems.  
        关键词：Laves Phase NbCr2;High Temperature Mechanical Properties;Alloying;Preparation Technol-ogy;Heat Treatment   
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      • Xu Daofen
        Vol. 35, Issue 4, Pages: 419-422(2015) DOI: 10.15980/j.tzzz.2015.04.025
        摘要：Microstructures and compositions of precipitated phases of Mg-4Al-1RE-xCa alloys before and after compressive creep were analyzed by optical microscope（OM）,scanning electron microscope（SEM）with energy dispersive spectrometer（EDS）and X-ray diffraction（XRD）,and the tensile properties and compressive creep behavior were also tested.The results show that the microstructure of as-cast AE41 alloy is characterized by classical dendrite,which is composed of coarseα-Mg matrix with un-even distribution and some acicular compound Al11Nd3 phase.As-cast microstructure is refined and skeletonshaped Al2 Ca phase and granulated Al2 Nd phase are increased gradually,while Al11Nd3 phase is decreased obviously with increasing in Ca addition.With the increase of Ca,yield strength and hardness of the alloys are improved,while the tensile strength and ductility of the alloy are decreases at ambient temperature.The strength is decreased and the plasticity is increased at high temperature,while elevated instantaneous tensile strength of the alloy is enhanced with the 0.8% Ca addition,where the value is138 MPa.Al2 Ca phase distributed along grain boundaries exhibits high thermal stability,which is beneficial for the improvement of the creep resistance.However,the mechanical properties are deteriorated significantly with formation of closed network of Al2 Ca phase.  
        关键词：Heat-resistant Alloys;Ca;Microstructure;Mechanical Properties;Creep Resistance   
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        发布时间：2023-12-18
      • Ma Yu,Xu Zhifeng,Zhang Yongcai,Ren Zhenfu
        Vol. 35, Issue 4, Pages: 423-426(2015) DOI: 10.15980/j.tzzz.2015.04.026
        摘要：Effects of solid solution time on microstructure and mechanical properties of ZL210 Aalloy were investigated by tensile test,optical microscope,X-ray diffraction,scanning electron microscopy and spectrum analysis.The results show that with the increase of solid solution time,the coarse second phase of ZL210 Aalloy is dissolved constantly into the matrix,and grain size is constantly increased,so the mechanical properties of ZL210 Aalloy is increased firstly and then decreased.With solid solution for11 h,the tensile strength,yield strength,hardness and elongation reach 321 MPa,142MPa,85 HV and14%,respectively.  
        关键词：Solid Solution Time;ZL210AAlloy;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Wang Meng,Dong Xuanpu,Yang Fan,Zheng Xuyu
        Vol. 35, Issue 4, Pages: 427-430(2015) DOI: 10.15980/j.tzzz.2015.04.027
        摘要：Inorganic ceramic coating on aluminum surface was prepared by sol-gel method,and influences of different proportions of silica on the coating surface quality,micro-hardness and interface were analyzed.Meanwhile,formation mechanism of the ceramic coating was described.The results demostrate that:when the ratio of the silica sol reaches TOES∶ H2O∶ EtOH of 1∶1∶10,the coating surface exhibits smooth and dense,with maximum micro-hardness.And the coating and the substrate occurs to be a certain degree of sintering reaction,with the generation of transition area on interface.AlN,Al3 SiCr,Al0.7Fe3Si0.3and other new phases in the coating can be observed.Composite coatings prepared by the sols and the ceramic powders takes coating complete at a lower temperature,thus fabricate a dense ceramic coating on aluminum surface.  
        关键词：Sol-gel Method;Ceramic Coating;Micro-Hardness;Surface Quality;Binding Mechanism   
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        发布时间：2023-12-18
      • Zhang Jing,Feng Yicheng,Wang Qin,Wang Liping,Guo Erjun
        Vol. 35, Issue 4, Pages: 430-433(2015) DOI: 10.15980/j.tzzz.2015.04.028
        摘要：Effects of different Ca and Nd addition on corrosion resistance of the Mg-6Al alloy were investigated by SEM（scanning electron microscopy）,immersion testing and electro-chemical analysis.The results reveal that with increasing in Ca and Nd addition,corrosion resistance of the Mg-6Al alloy is improved gradually,and with 2% Ca and 2% Nd addition,corrosion resistance of the alloy exhibits desirable.With further increasing in addition,the corrosion resistance is decreased slightly.Immersion testing reveals that change of pH value is firstly rapid and then slow,finally tending to be constant.  
        关键词：Mg-6Al Alloy;Electrochemical;Corrosion Properties   
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        发布时间：2023-12-18
      • Zhu Liyun,Zhang Lijun,Guo Kai,Shao Bo
        Vol. 35, Issue 4, Pages: 434-436(2015) DOI: 10.15980/j.tzzz.2015.04.029
        摘要：The effects of heat treatment on the microstructure and mechanical properties ofβ21salloy sheets were investigated by using optical microscope and tensile tester.The results show that the alloy after solution treatment at 815845 ℃ has a moderate strength and an excellent ductility at the room temperature,and with the increase of solution temperature,strength is decreased and plasticity is increased.After aging treatment,alloy exhibits high strength and good plasticity,and with the increase of aging temperature,the strength is decreased with the increase of plasticity.  
        关键词：β21s Titanium Alloy;Solution;Microstructure;Mechanical Properties   
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      • Wei Zhoubin,Liu Junzhao,Jian Le
        Vol. 35, Issue 4, Pages: 437-440(2015) DOI: 10.15980/j.tzzz.2015.04.030
        摘要：The multi-element high aluminum bronze coating was prepared on polished 45 steel substrate using a supersonic plasma spraying system.And the sample was treated with a high frequency induction remelting equipment in order to improve comprehensive properties of tinterface.The diffusion behaviors of Fe,Co,Ni and Mn in the samples during induction remelting process were analyzed by XRD,SEM and EPMA.The results show that the diffusion distance of Fe in the substrate is very short.And Co can easily dissolve in Fe and diffuse from coating to substrate while the diffusion of Cu accompanies with Ni is from the coating to the substrate.The diffusion rate of Mn in interface is slow.Fe and Co can be enriched in gray phases in form of Fe3Co7.Meanwhile,Ni is slightly enriched in gray phases in the forms of NiCu and NiAl.In addition,Cu is substituted by Ni to form AlNi2 Mn,taking Ni uniform distribution.Mn is distributed evenly in the coating in form of AlNi2 Mn.  
        关键词：Supersonic Plasma Spraying;Induction Remelting;Diffusion   
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      • Zhang Guoxi,Ren Bo,Zhao Ruifeng,Guan Shaokang,Teng Yingyao
        Vol. 35, Issue 4, Pages: 440-443(2015) DOI: 10.15980/j.tzzz.2015.04.031
        摘要：The CuxCrFeNiAl（x =0、0.2、0.5、1.0、2.0）high entropy alloys were prepared by arc melting process.The microstructure and hardness of the alloys at as-cast and aging treatment condition（at 600℃for 12h）were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）and digital display Vickers hardness tester.The results show that the alloys are composed of a mixed structure of BCC,FCC,andα-NiAl phases at low Cu contents（x≤0.5）.With Cu content more than 1.0,the alloys are composed of FCC1phase（in rich Cr-Fe-Ni）,FCC2（in rich Cu-Ni）andα-NiAl phases.The CrFeNiAl alloy with BCC phase has the highest hardness of 641 HV,whereas the Cu2 CrFeNiAl alloy with FCC phase has the lowest hardness of 375 HV.After aging treatment,the phase change of the alloys is absent,however,its microstructure is more uniform,and there are some precipitates of nano-particles in interdendrite regions.Thus the hardness of aged alloys is higher than that of as-cast alloys.  
        关键词：High-entropy Alloy;Aging Treatment;Microstructure;Hardness   
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        发布时间：2023-12-18
      • Cai Wei,Liao Yumin,Zhang Ying,Liu Yao,Pan Shaobin
        Vol. 35, Issue 4, Pages: 444-446(2015) DOI: 10.15980/j.tzzz.2015.04.032
        摘要：Effects of heat treatment and SiC content on microstructure and mechanical properties of C194 alloy were investigated.The results show that the desirable comprehensive properties of the alloy can be obtained with cold rolling reduction of 85% and aging treatment at 375 ℃for 2h.The tensile strength of the alloy with 0.6% SiC reaches 339.03 MPa after aging treatment,increased by 7.7%than the C194 alloy without SiC after aging treatment,and the satisfied electrical conductivity is retained.Compared with the cold rolling alloy without SiC addition,tensile strength of the alloy with aging treatment after cold rolling reaches 313.6 MPa,only increased by 0.41%,while the tensile strength of the alloy with SiC reaches 338.78 MPa,increased by 6.14%.  
        关键词：C194Alloy;SiC;Aging Treatment   
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      • Zhang Xi,Li Huaqing,Zhao Jieyang,Zheng Wensheng,Ma Decai,Xiang Chaojian,Chen Zhongping
        Vol. 35, Issue 4, Pages: 446-448(2015) DOI: 10.15980/j.tzzz.2015.04.033
        摘要：Purification of oxygen-free copper（99.987 6%）by horizontal zone refining under Ar atmosphere was carried out.The main inclusion elements such as Pb、Sn、Ag、S are reduced obviously,and the highest purity of Cu reaches 99.991 7%after 13 passes zone remelting.The purity of copper is increased from 3Nto 4N,which indicates feasibility of horizontal zone refining in obtaining high purity copper（≤5N）.  
        关键词：Oxygen-free Copper;Purification;Zone Refining   
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      • Vol. 35, Issue 4, Pages: 372(2015)
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