SPCC/AM60/SPCC复合板热拉伸变形行为  

Hot Tensile Deformation Behavior of SPCC/AM60/SPCC Composite Plate

作　　者：刘泽成 郑小平 李红斌 田亚强 陈连生 LIU Ze-cheng;ZHENG Xiao-Ping;LI Hong-bin;TIAN Ya-qiang;CHEN Lian-sheng(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan Hebei 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210

出　　处：《华北理工大学学报（自然科学版）》2022年第3期39-45,共7页Journal of North China University of Science and Technology：Natural Science Edition

基　　金：河北省钢铁联合基金(E2017209121)。

摘　　要：为了研究SPCC/AM60/SPCC双金属多层复合板在不同变形温度、应变速率条件下的热拉伸变形行为,通过Gleeble 3500热模拟试验机对复合板板材进行热拉伸试验,利用扫描电子显微镜对AM60镁合金基体和SPCC钢基体的拉伸断口进行了表征。拉伸变形温度为250~350℃,应变速率为0.1~0.001 s^(-1),分析了复合板的真实应力-应变曲线和AM60镁合金基体、SPCC钢基体的断口形貌,计算了应变速率敏感性指数。结果表明:应变速率不变,随着变形温度升高,复合板峰值应力表现出下降趋势,而延伸率则明显增大;变形温度不变,应变速率增大,流动应力表现出增大的趋势而延伸率表现出相反的趋势,并且这种趋势随温度升高而减弱;应变速率敏感性指数随温度升高而升高;通过断口形貌分析表明,变形温度越高则复合板的塑性越好。In order to study the hot tensile deformation behavior of SPCC/AM60/SPCC bimetallic multilayer composite plate under different deformation temperatures and strain rates,the hot tensile test of composite plate was carried out by Gleeble 3500 thermal simulation test machine,and the tensile fracture of AM60 magnesium alloy matrix and SPCC steel matrix was characterized by electron scanning microscope.The tensile deformation temperature is 250-350℃,and the strain rate is 0.1-0.001 s^(-1).The real stress-strain curve of the composite plate and the fracture morphology of AM60 magnesium alloy matrix and SPCC steel matrix were analyzed,and the strain rate sensitivity index was calculated.The results show that the peak stress of the composite plate decreases and the elongation increases obviously with the increase of deformation temperature.When the deformation temperature remains unchanged,the strain rate increases,the flow stress shows an increasing trend,while the elongation shows an opposite trend,and this trend decreases with the increase of temperature.The strain rate sensitivity index m increases with the increase of temperature.The fracture morphology analysis shows that the higher the temperature,the better the plasticity of the composite plate.

关 键 词：复合板 热拉伸 AM60镁合金 应变速率敏感性指数 

分 类 号：TG146.2[一般工业技术—材料科学与工程]