首页|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

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

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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 microstruc-ture 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 thick-walled positions,local loading not only helped eliminate the solidification defects,but also refined the microstructure including α-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 en-hancement 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,respec-tively,owing to the formation of spherical eutectic Si phases and nano-sized β'',Q and S precipitates.

Al-Si-Fe-Mn-Mg-Cu alloySqueeze castingLocal loadingRefinementSolidification defectsStrengthening mechanism

Shuancheng Meng、Minqiang Gao、Yan Liu、Li Yang、Huan Ma、Jiehua Li、Jianjun Wang、Renguo Guan

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School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China

Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province,Dalian Jiaotong University,Dalian 116028,China

Engineering Research Center of Continuous Extrusion,Ministry of Education,Dalian Jiaotong University,Dalian 116028,China

Institute of Casting Research,Montanuniversität Leoben,Leoben A-8700,Austria

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2024

10.1016/j.jmst.2023.12.082

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.200(33)