摘要
为满足副车架轻量化要求,探究一体铸造铝合金副车架铸造质量。对某车型砂型一体铸造铝合金副车架样件本体取样,用光学金相显微镜(OM)、拉伸试验机、维氏硬度计、扫描电镜(SEM)分析铝合金副车架本体显微组织和力学性能。结果表明:经T6态热处理,固溶538℃/12 h+时效155℃/6 h,铝合金副车架铸件的显微组织主要由α-Al基体和分布在晶界的共晶Si组成,平均抗拉强度为247.3 MPa,平均伸长率为1.9%,平均硬度为113HV,断裂形式为脆性断裂。一体铸造铝合金副车架经过疲劳耐久台架试验,纵向力耐久试验达到目标值35万次不开裂,侧向力耐久试验达到目标值30万次不开裂,顺利通过台架疲劳耐久试验。
In order to meet the lightweight requirements of the subframe,the casting quality of the integrated casting aluminum alloy subframe was investigated.The microstructure and mechanical properties of sample cut from an aluminum alloy subframe integrally cast in sand mold for a certain vehicle model were analyzed using optical microscopy(OM),tensile testing machine,Vickers hardness tester,and scanning electron microscopy(SEM).The results show that the microstructure of the aluminum alloy subframe casting after T6 heat treatment(solution 538 ℃/12 h+aging 155 ℃/6 h)is mainly composed of α-Al matrix and eutectic Si distributed at grain boundaries.The average tensile strength of the tensile sample taken from the aluminum alloy subframe body is 247.3 MPa,the average elongation is 1.9%,and the average hardness is 113HV.The fracture form of the sample is brittle fracture.The integrally cast aluminum alloy subframe has passed the fatigue durability bench test.The longitudinal force durability test has reached the target value of 350 000 times without cracking,and the lateral force durability test has reached the target value of 300 000 times without cracking.It has successfully passed the bench fatigue durability test.
作者
孟祥超
孙有平
何江美
罗国健
罗章
吴光庆
MENG Xiangchao;SUN Youping;HE Jiangmei;LUO Guojian;LUO Zhang;WU Guangqing(School of Mechanical and Transportation Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Earthmoving Machinery Collaborative Innovation Center,Liuzhou 545006,China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology,Liuzhou 545006,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2023年第3期22-27,共6页
Ordnance Material Science and Engineering
基金
中央引导地方科技发展专项(桂科ZY21195053)
柳州市科技计划项目(2021CBA0102)。
关键词
砂型一体铸造
铝合金副车架
显微组织
力学性能
热处理
sand mold integrated casting
aluminum alloy subframe
microstructure
mechanical properties
heat treatment
