最新刊期
      卷 38 ， 期 3 ， 2018
      • Li Yongquan,Li Xuan,Li Jilin
        Vol. 38, Issue 3, Pages: 233-237(2018) DOI: 10.15980/j.tzzz.2018.03.001
        摘要：Ce-Y modified aluminum coatings were prepared on DZ125 alloy by pack cementation processes at 950 ℃for 2 h.The microstructure and formation mechanism of the coatings were investigated.The friction-wear properties of the DZ125 alloy and the coatings were analyzed comparatively at 20 ℃,300℃ and 600℃.The results show that the prepared Ce-Y modified aluminum coatings with a thickness about 125μm exhibit compact,which mainly consist of Al3Ni2,Al3Ni and Cr7Ni3.The Ce-Y modified aluminum coatings have the more superior anti-friction behavior than DZ125 alloy with sliding at 20 ℃and 600 ℃,while the opposite results can be observed with sliding at 300℃.Sliding at 20℃,the wear mechanisms of DZ125 alloy are characterized by delamination wear and slight abrasive wear,while those of the Ce-Y modified aluminum coating are surface scratches.The wear mechanisms of DZ125 alloy are turned to be delamination wear,adhesive wear and abrasive wear,and those of the Al-Ce-Y coating are characterized by delamination wear and abrasive wear when the sliding temperature is increased up to300 ℃.Sliding at 600℃,the dominated wear mechanisms of both substrate and the coating can be concluded as delamination wear and abrasive wear.  
        关键词：DZ125 Alloy;Ce-Y Modified Aluminum Coating;Coating Structure;Wear Resistance   
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        发布时间：2023-12-18
      • Pan Chenggang,He Xiaolong,Ding Zizheng,Chang Qingming
        Vol. 38, Issue 3, Pages: 238-241(2018) DOI: 10.15980/j.tzzz.2018.03.002
        摘要：The SiCp/Ni35,Ni@SiCp/Ni35 and Cu@SiCp/Ni35 composite coatings on H13 steel were prepared by laser cladding.A kind of thermal fatigue test equipment which is more suitable for aluminum alloy die casting conditions was developed.The coatings were subjected to 600 thermal fatigue cycles.The coating microstructure was observed by SEM-EDS.The results show that thermal fatigue properties of laser cladding coatings with SiCpare lower than that of H13 steel substrate.The low strength and thermal expansion coefficient as well as poor wettability of graphite are responsible for crack initiation,and oxidation of metal silicides result in crack propagation.  
        关键词：Laser Cladding;SiCp;Ni35;Thermal Fatigue   
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      • Wu Mengwu,Li Xiaobo,Guo Zhipeng,Xiong Shoumei
        Vol. 38, Issue 3, Pages: 242-246(2018) DOI: 10.15980/j.tzzz.2018.03.003
        摘要：The externally solidified crystals（ESCs）in the shot sleeve have a great influence on the final microstructure and performance of magnesium alloy castings during the cold-chamber high pressure die casting（HPDC）process.The research progress was reviewed on the ESCs in the microstructure of magnesium alloy die castings.Some significant research findings were summarized,which were related with the microstructure characteristics of the ESCs,the validation of the " ESCs" theory by experiments and simulation,the morphology,distribution and content of the ESCs at different locations of the die castings and under different process parameters during the HPDC process,as well as the effects of the ESCs on the mechanical properties of magnesium alloy die castings.Finally,the problems existing in the current study of the ESCs in the microstructure of cold-chamber high pressure die cast magnesium alloy were analyzed,and the research directions of future were forecasted.  
        关键词：Magnesium Alloy;Cold-chamber High Pressure Die Casting;Microstructure;Externally Solidi fied Crystals   
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        发布时间：2023-12-18
      • Zhu Zhenfeng,Gao Qianlin,Sheng Guangying,Li Peisheng,Yin Hongxia
        Vol. 38, Issue 3, Pages: 247-250(2018) DOI: 10.15980/j.tzzz.2018.03.004
        摘要：The stress corrosion cracking（SCC）behaviors of Al-3.7 Cu-0.8 Mg-0.7 Mn alloy at various temperatures and corrosive media were investigated by slow strain rate test（SSRT）.The fracture surface was observed by metallographic microscope and the fracture morphology was analyzed by SEM.The results show that the alloy exhibits the strong stress corrosion susceptibility in 3.5% NaCl solution at 25℃,40 ℃and 50℃,and it is increased with increasing in temperature.The fracture surfaces exhibit typical intergranular fracture.At 25 ℃,the values of the intergranular corrosion（ISSRT）reach 3.17%,8.83%and 14.4%corresponded to 3.5% NaCl,3.5% NaCl+0.5% H2O2,3.5% NaCl+1.0% H2O2 conditions,respectively.The alloy presents the strong stress corrosion susceptibility with the changes of corrosion conditions,so fracture is easily formed.  
        关键词：Al-3.7Cu-0.8Mg-0.7Mn Alloy;Stress Corrosion Cracking;Slow Strain Rate Test   
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        发布时间：2023-12-18
      • Zong Xuewen,Zhang Bin,Quan Kun,Xiong Cong
        Vol. 38, Issue 3, Pages: 251-253(2018) DOI: 10.15980/j.tzzz.2018.03.005
        摘要：For the cold crucible energy utilization rate,three-dimensional electromagnetic field d  
          
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      • Ding Qunyan,Liu Jia,Zeng Xin,Li Wei
        Vol. 38, Issue 3, Pages: 254-256(2018) DOI: 10.15980/j.tzzz.2018.03.006
        摘要：In order to improve the control accuracy and speed of the casting pouring temperature control system,optimization of the casting pouring temperature control system under the control of single chip microcomputer was put forward.Based on the typical casting process requirements,the scheme of the temperature control system was designed.The hardware circuit was designed with C8051 F340 single chip microcomputer as controller and thermocouple WRP-130 as temperature sensor.PID algorithm based on the optimized neural network as control strategy,pouring temperature collected at the working-field and calibration of temperature as the input,the output volume control was calculated.MCU was used to control the actuator according to the control quantity to control the pouring temperature of the casting process,so thermal deformation of the casting was improved.Finally,the simulation experiment shows that the casting temperature MCU control system can control accurately the temperature,so thermal deformation of casting products was improved,and the yield rate is increased.  
        关键词：Pouring Temperature;PID Algorithm;C8051F340;Temperature Control;Optimization   
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        发布时间：2023-12-18
      • Wang Baojian,Yan Peiwen,Niu Xiaofeng,Wang Chenchen,Song Zhenliang,Di Jingru
        Vol. 38, Issue 3, Pages: 256-258(2018) DOI: 10.15980/j.tzzz.2018.03.007
        摘要：The smoothed particle hydrodynamics method（SPH）was used to simulate the filling process of low pressure casting,and the simulated results were compared with those of Win-cast software.The results show that the SPH method is basically consistent with those of Win-cast software,so the SPH method can simulate the filling process of low pressure casting accurately.  
        关键词：Filling Process;Low Pressure Casting;Numerical Simulation;SPH   
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        发布时间：2023-12-18
      • Vol. 38, Issue 3, Pages: 253(2018)
        摘要：<正>由上海市压铸技术协会、宁波市铸造协会、宁波市铸造协会压铸分会、北仑区压铸模具行业协会联合主办,第一压铸网协办的"2018年压铸模具技术培训班"将于2018年4月67日在宁波力劲机械有限公司举办。此次压铸模具培训班得到中国铸造协会压铸分会、宁波力劲机械有限公司的大力支持。  
          
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        发布时间：2023-12-18
      • Vol. 38, Issue 3, Pages: 266(2018)
        摘要：<正>2018年3月2日,东莞市锐风机械有限公司在湖北荆州公安县建设第二压铸机生产基地。目前,新项目用地平整工作已完成,并已开工建设。据了解,湖北锐风压铸机生产项目,投资主体为湖北锐动机械有限公司,项目位于湖北荆州市公安县斗湖堤镇孱陵工业园,占地面积约100亩,前期预计投资1.5亿元,计划2018年底建成投产,建成年产500台（套）冷室压铸机的生产规模。  
          
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        发布时间：2023-12-18
      • Vol. 38, Issue 3, Pages: 273(2018)
        摘要：<正>2018年3月1日,广东鸿图科技股份有限公司（"广东鸿图"）发布2017年年度业绩报告。2017年公司实现营业收入50.03亿元,同比增长86.79%;归属于上市公司股东的净利润2.96亿元,同比增长78.34%。广东鸿图表示,报告期内业绩同比增长,原因主要由于2016年收购宁波四维尔工业有限责任公司100%股权,于2017年4月开始将宁波四维尔工业有限责任公司纳入合并报表范围,对公司整体业绩有较大拉动作用。  
          
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      • Vol. 38, Issue 3, Pages: 290(2018)
        摘要：<正>2018年2月8日,从宁波北仑区环保局获悉,宁波赛亚益机械制造有限公司投资建设汽配模具及灯具压铸配件生产项目,项目位于宁波北仑区大碶大浦河北路10号。目前,该项目现已进入环保公示阶段。据了解,宁波赛亚益本次建设的压铸模具项目,总投资1500万元,租用生产厂房约4 690平方米。项目建成后,  
          
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        发布时间：2023-12-18
      • Vol. 38, Issue 3, Pages: 299(2018)
        摘要：<正>国内发布油耗和新能源汽车积分制度百公里,,但2020年国内四阶段乘用车油耗限值为5升/2014年国内乘用车平均油耗为7.22升/百公里,依靠传统手段无法满足要求,传统车企必须发展轻量化降低油耗。纯电动车新能源汽车积分和续航里程直接相关,新能源车企需要轻量化来增加续航里程。铝合金具有减重效果好、安全性好等优点,是汽车轻量化的最佳选择。  
          
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        发布时间：2023-12-18
      • Vol. 38, Issue 3, Pages: 302(2018)
        摘要：<正>知名压铸件生产企业--爱柯迪股份有限公司（"爱柯迪"）发布公告,公司在广西柳州设立的全资子公司柳州爱柯迪精密部件有限公司（"柳州爱柯迪"）,已于2月23日完成工商注册登记手续,并取得《营业执照》。据悉,柳州爱柯迪系爱柯迪全资子公司,注册资金3千万元,主要从事汽车零部件及配件制造、模具及机械设备的  
          
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      • Vol. 38, Issue 3, Pages: 308(2018)
        摘要：<正>2018年3月1日佛山,行业知名的铝合金压铸厂商--广东文灿压铸股份有限公司（"文灿股份"）发布2017年度业绩报告年公司实现营业收入。201715.57亿元,同比增长27.98%;净利润1.55亿元,同比增长0.39%。文灿股份表示,报告期内,公司对内整合资源、优化管理,对外不断加大市场开发和新产品研发的力度,合理调整产品结构,实现了公司营业收入和净利润稳定增长的目标。  
          
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        发布时间：2023-12-18
      • Vol. 38, Issue 3, Pages: 326(2018)
        摘要：<正>2018年2月9日山东日照,博众优浦（常熟）汽车部件科技有限公司投资建设的优浦汽车零部件项目签约山东日照经济开发区。该项目总投资2.5亿元,主要生产汽车精密铸造零部件。包括转向器、转向管柱等汽车关键零部件。公司生产的产品将为BOSCH（博世）、NSK（日本精工）、  
          
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      • Vol. 38, Issue 3, Pages: 341(2018)
        摘要：<正>2018年2月28日,惠亚科技（武汉）有限公司开工仪式在湖北仙桃龙华山举行。据悉,项目前期投资2 000万元,用地面积232亩,主要生产铝合金平面显示器外壳,镁合金高架地板,压铸件及模具、引擎压铸件产品等。仙桃市常务副市长严启方出席并讲话,他表示,近年来,仙桃市认真服务台企,促进台企在仙桃迎来大发展,取得了大进步。惠亚选择落户仙桃、布点华中、辐射全国,将为仙桃市工业经济发展再添新成员,注入新动力,增添新活力。  
          
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        发布时间：2023-12-18
      • Li Weikai,Han Baohong,Zhao Zhongmin
        Vol. 38, Issue 3, Pages: 259-262(2018) DOI: 10.15980/j.tzzz.2018.03.008
        摘要：The ceramics have been widely used armor materials in the world depending on their high hardness,high modulus and low density.The research and application of ceramic materials in armor application were reviewed,and the development of ceramic materials including ceramic composite armor and ceramic/metal functionally graded composite armor was expounded.The physical behavior and mechanical properties as well as ballistic performance of ceramic armor materials were described emphatically,and the dynamic mechanical behavior of ceramic armor materials was introduced,and the development and research prospect of ceramic dynamics were also put forward.  
        关键词：Ceramic Armor Materials;Development Status;Dynamic Mechanical Behavior   
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      • Niu Jiayun,Zhao Yuliang,Shi Ya,Zhang Weiwen
        Vol. 38, Issue 3, Pages: 263-266(2018) DOI: 10.15980/j.tzzz.2018.03.009
        摘要：The processing parameters of ultrasonic vibration-squeeze cast Al-0.5 Cu-0.6 Mn alloy were optimized by orthogonal design.The microstructure and Rockwell hardness of the alloys were analyzed by optical microscope,scanning electron microscope and quantitative metallographic analysis.The results reveal that in four parameters,such as squeezing force,ultrasonic power,ultrasonic time and pouring temperature,squeezing pressure is the most important factor influencing the Rockwell hardness,and its contribution rate reaches 65.4%.Ultrasonic power is the second factors,which contributes 29.3%.The highest Rockwell hardness and desirable microstructures of the alloy can be obtained at pouring temperature of 710 ℃,squeezing pressure of 100 MPa,ultrasonic vibration power of 600 Wfor 50 s.  
        关键词：Orthogonal Experiment;Ultrasonic Vibration;Squeeze Casting;Al-Cu-Mn Alloy   
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      • Chen Guoen,Wang Xueyang,Huang Zhiyuan,Chen Zhenyu,Zhao Weihong
        Vol. 38, Issue 3, Pages: 271-273(2018) DOI: 10.15980/j.tzzz.2018.03.011
        摘要：In the die casting process of aluminum alloy parts,its quality is affected greatly by mold temperature.Compared with small and simple structure,the quality of large and complex parts is more sensitive to the change of mold temperature.The casting defects such as gas hole and shrinkage porosity is largely related with the unreasonable mold temperature gradient.In die casting production cycle,reasonable temperature range should realize the heat balance of mold emitted and absorbed to reduce the thermal stress of die effectively,which could be helpful to improve the sequence solidification condition of castings,thus improving the casting quality and production efficiency,and increasing the service life of the die.Taking the mold of an automobile clutch shell as an example,the CAE simulation analysis was used to understand the law of the mold temperature change during the die casting process,which provided a reference for the die casting industry.  
        关键词：Die-Casting;Mold Temperature;Heat Balance;CAE Simulation Analysis   
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        发布时间：2023-12-18
      • Li Xianjun,Huang Jizhan
        Vol. 38, Issue 3, Pages: 274-276(2018) DOI: 10.15980/j.tzzz.2018.03.012
        摘要：The hydraulic pump cover with left and right symmetrical structure was designed on a set of die casting die with two parts in one mould,which could reduce the cost of mould manufacturing and improve the production efficiency.The mould structure exhibits compact due to symmetrical layout cavity and horizontal and downcast core pulling mechanism.Core structure with the insert type core is more reasonable.The pouring system which is the first to fill the deep cavity of the mold and the overflow slot arranged on the parting surface can optimize the exhaust and slag discharge capacity of the die.The practical production shows that the die structure has the economical and reasonable features,and the production quality is stable,meeting the quality and production requirements.  
        关键词：Die-casting Die;Pump Cover;Cavity Layout;Gating System;Optimal Design   
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      • Liu Xiuzhong,Zhu Xingyuan,Wang Huajun,Peng Chunyu,Gui Qianfu,Hui Youke
        Vol. 38, Issue 3, Pages: 277-279(2018) DOI: 10.15980/j.tzzz.2018.03.013
        摘要：To verify the effects of spraying heat insulating material on the peak temperature of ferrous metal liquid forging die,ProCAST software was used to simulate the liquid forging process of gearbox plate and analyze the temperature field of the die surface with spraying heat insulating material.The simulated results reveal that the coating layer can restrain effectively the temperature fluctuations of die cavity and take the temperature slowly rising.However,the ability of reducing the die maximum working temperature by spraying heat insulating material exhibits low,so it is difficult to solve the premature failure of liquid die,which is caused by high temperature of liquid metal.It is a potential way to improve the service life of ferrous metal squeezing die by the forced cooling technology.  
        关键词：Coating Layer;Ferrous Metal;Liquid Forging;Cyclic Thermal Equilibrium;Die Temperature   
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      • Huang Jianbo,Zhang Liuwei,Wang Lei
        Vol. 38, Issue 3, Pages: 280-282(2018) DOI: 10.15980/j.tzzz.2018.03.014
        摘要：Through using the mullite as the main addition to the refractory,talcum powder,diatomaceous earth,mica powder for the auxiliary refractory aggregate,rectorite and attapulgite for the composite suspension agent and phenolic resin as well as white latex as a composite binder,an alcohol-based lost foam casting coating for aluminum alloy was prepared by orthogonal experiment and differential analysis.The results show that the coating prepared presents the satisfied strength and good permeability in the casting process with absence of fire,back spraying as well as the whole sintering,meanwhile,castings surface is clean without porosity and sand.  
        关键词：Mullite;Mica Powder;Aluminum Alloy;EPC;Alcohol Based Coating   
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        发布时间：2023-12-18
      • Zhang Haijing,Chen Xingrui,Le Qichi
        Vol. 38, Issue 3, Pages: 283-287(2018) DOI: 10.15980/j.tzzz.2018.03.015
        摘要：A varied ultrasonic technology was applied to refine the as-cast microstructure and improve the mechanical properties of a ZK60（Mg-Zn-Zr）alloy with255 mm in semi-continuous casting,which was analyzed comparatively with those of ones without ultrasonic treatment and static frequency ultrasonic semi-continuous casting.The change of acoustic pressure via time in two acoustic field was simulated by numerical method.The varied-frequency acoustic field can promote the formation of smallα-Mg globular grains and change the distribution and morphology ofβphases in the castings,greatly refining grain size in the alloy compared with that of static frequency field.Ultimate tensile strength and elongation of the alloy with varied-frequency field are increased to 280 MPa and 8.9%,respectively,which are 19.1%and78.7% higher than those of ones obtained from billet without ultrasonic treatment and are 11.6% and28.2% higher than that of ones by static-frequency ultrasound treated billets.Different refinement efficiencies appear in different regions of billet,which is attributed to the sound attenuation.The varied-frequency ultrasound can improve refinement effect by enhancing cavitation-enhanced heterogeneous nucleation and dendrite fragmentation effects.  
        关键词：ZK60Magnesium Alloy;Ultrasonic Field Treatment;Grain Refinement;Mechanical Properties;Semi-continuous Casting   
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        发布时间：2023-12-18
      • Wang Donglin,Wu Jinhui,Cai Bin,Li Fuqiang,Wang Zhipeng,Li Anqiang,Wang Wenjia
        Vol. 38, Issue 3, Pages: 288-290(2018) DOI: 10.15980/j.tzzz.2018.03.016
        摘要：Production process,microstructure and chemical composition of the double metal composite pipe were introduced,and defects in the double-metal composite pipe were analyzed during centrifugal casting,hot extrusion,heat treatment process.The results reveal that by controlling rotary velocity in9501 050 r/min,thick-heterogeneity of pipe-blank is decreased greatly,and crack is basically eliminated.Concave and crack in inner surface of composite pipe can be eliminated with heating at 1 180℃and preheating mold at 460 ℃ as well as squeezing force of 35 MN,squeezing velocity of 65 mm/s,squeezing ratio of 6.4 and the imported special glass powder lubricant.With quenching at 910 ℃ for 90 min and oil cooling+tempering at 650℃for 150 min and air cooling,mechanical properties of the composite pipe can meet technological requirement.  
        关键词：Double Metal Composite Pipe;Defects;Control;Centrifugal Casting;Hot Extrusion   
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        发布时间：2023-12-18
      • Gu Jianfeng,Du Xueming,Zhang Bo,Li Jiaqi
        Vol. 38, Issue 3, Pages: 291-294(2018) DOI: 10.15980/j.tzzz.2018.03.017
        摘要：The preparation technology of 304 stainless steel-high chromium cast iron bimetal composite wear-resistant pipe by centrifugal casting was described.The composition,microstructure and mechanical properties of the inner layer of bimetal composite pipe were analyzed.The components of different thickness wear-resistant layers were tested by EPMA,and the segregation characteristics of different elements in the inner layer were investigated.By analyzing the formulas of centrifugal force and viscosity resistance,the interaction of centrifugal force and viscosity resistance leads to the segregation of elements,which are responsible for the change of microstructure and the gradient distribution of mechanical properties.  
        关键词：Centrifugal Casting;Bimetal Composite Wear-resistant Pipe;HCCI;Element Segregation;Mechanical Properties   
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        发布时间：2023-12-18
      • Chen Tianci,Li Yuandong,Li Ming,Sun Yanlan,Bi Guangli,Jiang Chunhong
        Vol. 38, Issue 3, Pages: 295-299(2018) DOI: 10.15980/j.tzzz.2018.03.018
        摘要：The A356/2024 sheet was fabricated by solid-liquid rolling.The solidification structure and element distribution near the interface of A356/2024 sheet were detected systematically by SEM and EDS.The bonding strength of the interface was evaluated by hardness and XRD.The results reveal that the cracks,pores and other defects at the interface of A356/2024 sheet are disappeared gradually with the increase of pouring temperature of the liquid metal.The interdiffusion of alloy elements in A356 aluminum alloy and 2024 aluminum alloy occurs and there exists an about 110μm wide diffusion layer near the interface,indicating metallurgical bonding.The elements at the interface are enriched to form hard brittle phases such as Al2 CuMg and CuAl2 intermetallic compounds at the lower pouring temperature.The hardness near the interface of A356/2024 sheet is changed from 61.5 HV to 123.9 HV sharply.Therefore,it is easy to cause brittle fracture at the interface and reduce the bonding strength.The elements at interface are diffused uniformly on the both sides at the higher pouring temperature,which is not easy to form the accumulation of elements.The hardness of the compound sheet is increased from 63.3 HV to104.5 HV at one side of the A356 aluminum alloy along the vertical direction of the interface to 2024 aluminum alloy,showing agradient change trend with the firm interface bonding.  
        关键词：Aluminum Alloy;Laminated Composite;Solid-liquid Rolling;Interface Morphology   
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        发布时间：2023-12-18
      • Liu Yixiong,Zheng Zhenxing,Cao Genghua,Zhu Dezhi
        Vol. 38, Issue 3, Pages: 300-302(2018) DOI: 10.15980/j.tzzz.2018.03.019
        摘要：In order to improve the wettability between SiC particles and 7075 Al matrix alloy,copper oxide was formed on the surface of SiC particles by chemical deposition method.7075 Al composites reinforced by CuO modified SiC particles were prepared by squeeze casting technology.The microstructure and mechanical properties of the composites were analyzed.It is an economic and effective way that the SiC particles are modified with copper oxide on the surface by chemical deposition method to improve the wettability between SiC particles and 7075 Al matrix alloy.The modified SiC particles are uniformly distributed in the matrix alloy with a desirable interfacial bonding with the 7075 Al matrix alloy.In addition,the composites fabricated presents a good mechanical properties with tensile strength of 378 MPa.  
        关键词：Aluminum Matrix Composite;Surface Modification;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Hu Shiping,Chen Leping,Zhou Quan,Wang Jun,Zhang Li,Wu Han
        Vol. 38, Issue 3, Pages: 303-308(2018) DOI: 10.15980/j.tzzz.2018.03.020
        摘要：Effects of some treating technologies,such as without magnetic field treatment,with pulsed magnetic field treatment,alternate magnetic field treatment and compound treatment of pulsed magnetic field and alternate magnetic field,on solidified structure and mechanical properties of AZ31 magnesium alloy were investigated comparatively.Morphology of primary phase and grain size of the alloy with different pulse voltage,pulsed frequency and mould temperature under the conditions of compound treatment were obserevd.The results show that refinement effect of solidified structure by compound treatment is more efficient than that of pulsed magnetic field treatment or alternate magnetic field treatment.Average grain size of the alloy can be refined from 3.5 mm to 0.93 mm,and the fraction of equixed grains in the alloy can be increased from 55.8%to 97% by compound treatment.With the increase of the pulsed voltage or frequency,primary phase in the alloy is degraded gradually from well-developed dendrites into fine equiaxed grains or rosette crystals.When the mould temperature is at 20600 ℃,with the increase of mould temperature,solidified structure is refined firstly and then coarsened,and at 200℃,the grain size reaches the minimum value.For three treatment ways,compound treatment exhibits the best effects.Compared with those of conventional casting,tensile strength and elongation of the alloy are increased by 35.8% and 25.6%,respectively.  
        关键词：AZ31 Magnesium Alloy;Compound Treatment;Solidified Structure;Mechanical Properties   
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        发布时间：2023-12-18
      • Zhan Wei,Jin Fan,Liu Xurui,Zhang Lei
        Vol. 38, Issue 3, Pages: 309-311(2018) DOI: 10.15980/j.tzzz.2018.03.021
        摘要：Effects of compound magnetic field（CMF）coupled with steady magnetic field（SMF）and pulsed magnetic field（PMF）on microstructure and mechanical properties of the Mg93Zn6Y1 alloy were investigated.The results show that the microstructure of alloy is refined remarkably with CMF treatment compared with that of ones with SMF treatment or with PMF treatment,respectively.The primaryα-Mg in the alloy treated by CMF is transformed from fully developed dendrites with the average grain size of 1 180μm to rosette-like and polyhedral morphology with the average grain size of 146μm.Moreover,the second phase is changed into discontinuous fine reticular morphology with more homogeneous and dispersed distribution.The alloy treated by CMF exhibits the desirable mechanical properties,where yield strength,ultimate tensile strength and elongation at room temperature reach 172 MPa,231 MPa and 3.39%,which are increased by 73.4%,68.6% and 63.1%,respectively,compared with those of the untreated alloy.  
        关键词：Compound Magnetic Field;Mg93Zn6Y1 Alloy;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Li Junqi,Mao Feng,Yan Guangyuan,Cao Zhiqiang
        Vol. 38, Issue 3, Pages: 312-315(2018) DOI: 10.15980/j.tzzz.2018.03.022
        摘要：The effects of Er additions on the microstructure of eutectic Si was investigated using optical microscopy（OM）,scanning electron microscopy（SEM）and tensile testing.The modification mechanism was analyzed.The results show that Er can modify the shape of eutectic Si from coarse plate like to fine rod structure with full modification.The optimal mechanical properties of the A356 alloy can be obtained with 0.3% Er addition.After T6 treatment,the tensile strength and elongation of the A356 alloy are increased by 31.2% and 233%,respectively.  
        关键词：Er;A356 Alloys;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Zhao Zhongxing,Ju Wenlian,Zhang Xianfei,Liu Fengguo
        Vol. 38, Issue 3, Pages: 316-318(2018) DOI: 10.15980/j.tzzz.2018.03.023
        摘要：The density of aluminum alloy with different crystallization temperature range was measured,and the influence of crystallization temperature range on solidification mode of alloy was analyzed.Through the test and theoretical analysis,the results show that alloy crystallization temperature with a wide range is easy to form a larger constitutional supercooling range,and the more solid skeleton in mushy zone can be formed,meanwhile,less bubbles are drawn out during solidification and corresponding relationship between gas content and density of aluminum liquid is more desirable.Alloy with a small range of crystallization temperature is solidified in form of layer by layer solidification in the measuring cup of density testing and more bubbles are drawn out during solidification.In addition,the corresponding relationship between gas content and density of aluminum liquid is poor.  
        关键词：Cast Aluminum Alloy;Refining Effect Check;Crystallization Temperature Range;Reduce Pressure Solidification;Density   
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        发布时间：2023-12-18
      • Luo Guimin,Chen Ge,Lu Gang,Yan Qingsong,Zheng Qiangqiang
        Vol. 38, Issue 3, Pages: 319-323(2018) DOI: 10.15980/j.tzzz.2018.03.024
        摘要：The effects of alternating magnetic field current intensity on massive segregation and grain size in ZL205 Aalloy castings were investigated,and the mechanism of alternating magnetic field on massive segregation structure in ZL205 Aalloy was analyzed by using self-made alternating electromagnetic field solidification device.The results show that the alternating magnetic field can not only refine the grains but also reduce effectively the massive segregation structure in the grains.When the excitation current intensity is 5 A,the average grain size can be reduced to 74.6μm,decreased by 25.37% compared with that of ones without magnetic field,and the massive segregation of trace elements in ZL205 Aalloy is improved obviously.  
        关键词：Alternating Magnetic Field;Excitation Current;ZL205A Alloy;Massive Segregation   
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        发布时间：2023-12-18
      • Hua Ruyu,Xu Xuefeng,Xiao Yao,Qiu Zeyu,Xu Long
        Vol. 38, Issue 3, Pages: 323-326(2018) DOI: 10.15980/j.tzzz.2018.03.025
        摘要：A titanium alloy sheet metal bracket with wrinkle easily was difficult to form.Based on finite element method,the influence of blank shape and die size on wrinkling defects was analyzed.A new blank with an opening at the gap of the original blank was designed,which was fabricated by inverse finite element approach combined experiment.The die size was set with considering the difference of thermal expansion coefficient between the mold material and the titanium alloy,and the hot forming experiments were carried out at 650、660、670 and 680 ℃,respectively.And the experimental results reveal that the new billet can overcome effectively wrinkling in the forming process,and the forming temperature has great influence on the forming effect of parts.Wrinkling can’t be completely eliminated with low forming temperature,while surface optimization is aggravating and the cost is increased with high forming temperature.The optimum forming temperature is 670 ℃.  
        关键词：Hot Forming;Billet Optimization;Inverse Finite Element Approach;Wrinkle;Numerical Simulation   
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        发布时间：2023-12-18
      • Hua Chengwen,Gan Zhanghua,Jiang Panhui,Sun Yao,Lu Zhihong
        Vol. 38, Issue 3, Pages: 327-332(2018) DOI: 10.15980/j.tzzz.2018.03.026
        摘要：The effects of super-gravity field on the solidification structures and microhardness of Al97.2 Ni2.5 Cr0.3 alloy were investigated by OM（optical microscopy）,SEM（scanning electron microscopy）,EDS（energy dispersed sperctrometer）,XRD（X-ray diffraction）and hardness testing.The results show that the solidification microstructure of sample under super-gravity field can be divided into two parts that the main part in the intermediate region is the Al-Al3 Ni eutectic structure with more than 80%,and the second part is composted ofα-Al primary grains and Al-Al3 Ni eutectic structure in the surface region with less than 20%.The grains in the alloy can be refined obviously under super-gravity field.With the increase of gravity coefficient,the average grain size is decreased firstly and then increased.The diameter ofα-Al reaches the minimum value of 10.13μm under the gravity coefficient of G=3 000,and the diameter and spacing of Al3 Ni reaches the minimum value of 72 and 92 nm,under the gravity coefficient of G=2 000,respectively.Under the super-gravity field,the hardness of alloy in the core is the greater than that of the surface,which is mainly attributed to fine-grain strengthening mechanism.Difference of the solidification microstructure at the core and surface of sample is the difference of Ni content,which is caused by diffusion of the solute atoms due to the increased convection under the supergravity conditions.  
        关键词：Super-gravity Field;Solidification Structure;Al-Ni-Cr Alloy;Grain Refinement;Nanofibers   
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        发布时间：2023-12-18
      • Wu Sanhai,Li Changyun,Mao Changcheng,Zhang Jinzhi,Yang Erkuo,Mi Guofa
        Vol. 38, Issue 3, Pages: 332-335(2018) DOI: 10.15980/j.tzzz.2018.03.027
        摘要：Gypsum mould investment casting process of thin-walled shell was designed according to the structural characteristics and the requirements of properties.Then numerical simulation analysis of the casting process was carried out by View Cast software.Simulation results show that shrinkage and porosity defects can easily be formed in the top right part of the casting owing to inadequate feeding.And the gating system was optimized accordingly.The results show that shrinkage and porosity defects in the castings are obviously controlled and almost eliminated by setting pouring position from one side to the center of the shell and multi-point distribution of ingate.And the shell was produced with good quality and excellent performance.  
        关键词：Thin-walled Shell;Gypsum Mould Investment Casting;Numerical Simulation   
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        发布时间：2023-12-18
      • Yang Kang,Xie Jingpei,Chen Yanfang,Wang Aiqin,Ma Douqin,Wang Wenyan
        Vol. 38, Issue 3, Pages: 336-339(2018) DOI: 10.15980/j.tzzz.2018.03.028
        摘要：The problems of pocking and etch pits after corrosion were investigated in the plate made of molybdenum powder.The SEM,XRD and TEM experiments were conducted by sampling from different molybdenum plate.The results show that the content of oxygen in molybdenum powder and oxygen in the air in process have the extremely important influence on the quality of molybdenum plate.  
        关键词：Molybdenum Powder;Pure Molybdenum Plate;Corrosion Pit   
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        发布时间：2023-12-18
      • Li Hui,Yang Feng
        Vol. 38, Issue 3, Pages: 339-341(2018) DOI: 10.15980/j.tzzz.2018.029
        摘要：One ironing and three ironing deformation of QSn7-0.2 tin bronze sliding bearing blank were simulated by the Simufact software at the same ironing rate.The optimum forming process was determined by the equivalent plastic strain and equivalent stress of the sliding bearing forming part along the wall thickness as evaluated value.The results show that the equivalent plastic strain and equivalent stress of three continuous ironing are greater than that of once ironing,and the stress and strain of a ironing in the thickness of the wall is the smaller.In addition,the equivalent plastic strain of the ironing is gradually decreased from the outside to the inside,while the equivalent stress is decreased firstly and then increased.  
        关键词：Sliding Bearing;Simufact;Ironing;Equivalent Plastic Strain;Equivalent Stress   
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        发布时间：2023-12-18
      • Shao Ye,Liu Feng,Cheng Wanlin,Liu Ning,Zhang Ligui,Lin Zhihao,Peng Lijun
        Vol. 38, Issue 3, Pages: 342-345(2018) DOI: 10.15980/j.tzzz.2018.03.030
        摘要：The flow stress of Cu-Fe-P-Zn-Sn-Mg alloy and evolution of the microstructure during hot deformation were investigated at 750950 ℃ and strain rate at 0.0110 s-1 on Gleeble-1500 Dtest machine.The experimental results show that the true stress-strain curve of the alloy presents the typical characteristics of dynamic recrystallization.The dynamic recrystallization is controlled by both strain rate and deformation temperature.With decreasing in the temperature or increasing in the strain rate,the flow stress is increased,and the dynamic recrystallization easily occurs with increasing in deformation temperature or decreasing in strain rate.On the basis of the above experiments,the hot compression deformation constitutive equation in the process of hot deformation of the alloy was established.  
        关键词：Cu-Fe-P-Zn-Sn-Mg Alloy;Hot Deformation;Constitutive Equation   
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        发布时间：2023-12-18
      • Liu Junwei,Liu Jun,Lu Shiqiang,Yuan Minghua,Dai Muhai
        Vol. 38, Issue 3, Pages: 345-348(2018) DOI: 10.15980/j.tzzz.2018.03.031
        摘要：The influence of multi-step aging treatment on the mechanical properties and microstructure of QBe2 beryllium bronze alloy was analyzed.The results reveal that the optimum process of hard-state QBe2 beryllium bronze alloy is 240 ℃×2 h + 400 ℃×4 h,where the elongation,the elasticity modulus and the tensile strength of the alloy reach 17.7%,44.7 GPa and 833 MPa,respectively.The microstructure of beryllium bronze alloy is mainly composed ofαphase,βphase andγphase.The multi-step aging can refine theβphase in the microstructure of the QBe2 beryllium bronze alloy and control the number of intergranular reactions to improve the comprehensive mechanical properties of the alloy.  
        关键词：QBe2;Aging Treatment;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
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