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Microstructures and mechanical properties of semi-solid squeeze casting ZL104 connecting rod

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Transactions of Nonferrous Metals Society of China 2018年第2期28卷 235-243页

作者：王永飞赵升吨张晨阳西安交通大学机械工程学院西安710049

semi-solid squeeze casting（SSSC） and liquid squeeze casting（LSC） processes were used to fabricate a ZL104 connecting rod, and the influences of the process parameters on the microstructures and mechanical properties were investigated. Results showed that the tensile strength and elongation of the SSSC-fabricated rod were improved by 22% and 17%, respectively, compared with those of the LSC-fabricated rod. For SSSC, the average particle size（APS） and the shape factor（SF） increased with the increase of re-melting temperature（Tr）, whereas the tensile strength and elongation increased first and then decreased. The APS increased with increasing the mold temperature（Tm）, whereas the SF increased initially and then decreased, which caused the tensile strength and elongation to increase initially and then decrease. The APS decreased and the SF increased as squeezing pressure（ps） increased, and the mechanical properties were enhanced. Moreover, the optimal Tr, ps and Tm are 848 K, 100 MPa and 523 K, respectively.

关键词： aluminum alloy semi-solid squeeze casting semi-solid microstructure tensile strength elongation connecting rod

Effects of process parameters on semi-solid squeeze casting performance of aluminum alloy scrolls for scroll compressors

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China Foundry 2020年第5期17卷 347-356页

作者： Yong-fei Wang Sheng-dun Zhao Yi Guo Jun-ling Yang School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryBeijing 100190China

The aluminum alloy scroll is one of the key parts of the scroll compressors widely used in the air-conditioning,refrigeration,and heat pump *** this work,the semi-solid squeeze casting(SSSC)process was used to fabricate the aluminum alloy *** effects of process parameters including the pouring temperature,mold temperature,and squeezing velocity on the filling and solidification behaviors of the alloys were investigated through simulations based on the power law cut-off(PLCO)material *** show that there is a significant increase in the flow velocity of the slurry,and the area of the high-speed region enlarges with the increase of the pouring *** homogeneity of the temperature and velocity fields in the slurry is improved with an increase in mold *** the filling time and its variation rate decrease with an increase in squeezing *** maximum solidification time exhibits a linear variation with the increase in pouring *** shrinkage area is decreased by increasing the mold *** optimal process parameters of the SSSC process were obtained from simulation analysis,which are the pouring temperature of 595°C,mold temperature of 350°C,and squeezing velocity of 0.3 m·***,the qualified scroll casting was fabricated using the SSSC process under the optimal process parameters.

关键词： semi-solid squeeze casting aluminum alloy scroll compressor numerical simulation experimental verification

Effect of heat treatment on microstructure and properties of semi-solid squeeze casting AZ91D

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China Foundry 2020年第3期17卷 219-226页

作者： Zhi-yong You Ao-xue Jiang Zhuang-zheng Duan Gang-ping Qiao Jing-lei Gao Ling-bing Guo College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Huaxiang Group Co. Ltd.Linfen 011600China

semi-solid AZ91D magnesium alloy billets were prepared by near-liquidus heat ***-solid squeeze casting was conducted at 575,585 and 595℃,respectively,with 1 mm·s^-1 squeeze *** semisolid squeeze casting AZ91D samples were heat treated by T4(solution at 415℃for 24 h)and T6(solution at 415℃for 24 h+220℃for 8 h)processes,*** microstructure and mechanical properties of the alloy in different states were investigated by means of OM,SEM and tensile testing *** results show that compared to as-cast alloy,the grain size of the semi-solid squeezed AZ91D decreased significantly,and with the increase of semi-solid squeeze temperature,the grain size of AZ91D *** grains of the alloy were refined by T4 treatment,and further refined by T6 treatment.T6 treatment greatly improved the tensile strength,elongation,and hardness,but did not significantly improve yield *** 575℃squeeze casting and T6 treatment,the ultimate tensile strength(UTS)reached 285 MPa,the elongation reached 13.36%,and the hardness also reached the maximum(106.8 HV),but the yield strength(YS)was only 180 *** the process of semi-solid squeeze casting and heat treatment,the matrix grain was refined and a large number of precipitated and secondary precipitated phases of Mg17Al12 *** the average size of matrix grain and secondary precipitated phase decreased,while the volume fraction of secondary precipitated phase *** these resulted in high tensile strength,elongation and hardness.

关键词： AZ91D semi-solid squeeze casting solution aging treatment microstructure mechanical properties