Effect of local loading on microstructure and enhanced mechanical property of large complex castings prepared by Al-Si-Fe-Mn-Mg-Cu alloy during squeeze casting  

作　　者：Shuancheng Meng Minqiang Gao Yan Liu Li Yang Huan Ma Jiehua Li Jianjun Wang Renguo Guan 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province,Dalian Jiaotong University,Dalian 116028,China [3]Engineering Research Center of Continuous Extrusion,Ministry of Education,Dalian Jiaotong University,Dalian 116028,China [4]Institute of Casting Research,Montanuniversität Leoben,Leoben A-8700,Austria

出　　处：《Journal of Materials Science & Technology》2024年第33期215-226,共12页材料科学技术(英文版)

基　　金：supported by the National Key Re-search and Development Program of China(No.2022YFE0137900);National Natural Science Foundation of China(Nos.U2341253,U2241232,52371019 and 52301034);Natural Science Foundation of Liaoning Province(No.2023-BS-170);Dalian High-level Talents Innovation Support Program(No.2021RD06);Applied Basic Research Program of Liaoning Province(No.2022JH2/101300003).

摘　　要：Flywheel shells with a complex structure and large wall-thickness difference,as key components in heavy trucks,serve to connect the engine and transmission.Formability and mechanical performance control of such components should be taken into consideration.In this work,an Al–Si–Fe–Mn–Mg–Cu alloy was used to manufacture the flywheel shell via squeeze casting.The role of local loading on microstructure and mechanical property at thick-walled positions was investigated.Furthermore,the effect of the squeeze casting specific pressure and heat treatment on the microstructure and mechanical property of the Al–Si–Fe–Mn–Mg–Cu alloy flywheel shells was also analyzed.The results showed that at the thickwalled positions,local loading not only helped eliminate the solidification defects,but also refined the microstructure includingα-Al grains and secondary dendrite arm spacing.With increasing the squeeze casting specific pressure from 24 MPa to 32 MPa,microstructure refinement and mechanical property enhancement of squeeze casting flywheel shells were obtained.After T6 heat treatment,the yield strength and ultimate tensile strength of flywheel shells were further increased to 261.8 and 318.4 MPa,respectively,owing to the formation of spherical eutectic Si phases and nano-sizedβ’’,Q and S precipitates.

关 键 词：Al-Si-Fe-Mn-Mg-Cu alloy Squeeze casting Local loading REFINEMENT Solidification defects Strengthening mechanism 

分 类 号：TG1[金属学及工艺—金属学]