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

半固态挤压铸造铝ZL104合金连杆的显微组织及力学性能（英文）

作　　者：王永飞[1] 赵升吨[1] 张晨阳[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049

出　　处：《Transactions of Nonferrous Metals Society of China》2018年第2期235-243,共9页中国有色金属学报（英文版）

基　　金：Project(51335009)supported by the National Natural Science Foundation of China;Project(2014JQ7273)supported by the Natural Science Foundation of Shaanxi Province of China;Project(CXY1514(1))supported by the Xi’an Science and Technology Plan Projects,China

摘　　要：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.分别采用液态挤压铸造和半固态挤压铸造工艺成形ZL104铝合金连杆,研究不同工艺参数对连杆的显微组织及力学性能的影响规律。结果表明:与传统液态挤压铸造相比,半固态挤压铸造连杆的抗拉强度和伸长率分别提高了22%和17%。半固态挤压铸造过程中,随着重熔温度的增加,平均晶粒尺寸和形状因子都增大;随着模具预热温度的升高,平均晶粒尺寸增大,形状因子先增加后减小;这两种情况下连杆的抗拉强度和伸长率都先增加后减小。但随着挤压压力的提高,平均晶粒尺寸减小,且形状因子增大,连杆的力学性能明显提高。此外,成形半固态挤压铸造连杆的最佳重熔温度、挤压压力及模具预热温度分别为848 K、100 MPa及523 K。

关 键 词：aluminum alloy semi-solid squeeze casting semi-solid microstructure tensile strength ELONGATION connecting rod 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]