Tensile stress-strain behavior of metallic alloys  

金属合金的拉伸应力-应变行为（英文）

作　　者：Jun CAO Fu-guo LI Xin-kai MA Zhan-kun SUN 曹俊;李付国;马新凯;孙占坤(西北工业大学材料科学与工程学院凝固技术国家重点实验室,西安710072)

机构地区：[1]State Key Laboratory of Solidification Processing, School of Materials Science and Engineering,Northwestern Polytechnical University, Xi’an 710072, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第11期2443-2453,共11页中国有色金属学报（英文版）

基　　金：Project(51275414)supported by the National Natural Science Foundation of China;Project(3102015BJ(Ⅱ)ZS007)supported by the Fundamental Research Funds for the Central Universities,China;Project(130-QP-2015)supported by the Research Fund of the State Key Laboratory of Solidification Processing(NWPU),China

摘　　要：Tensile stress-strain curves of five metallic alloys,i.e.,SKH51,STS316L,Ti-6Al-4V,Al6061and Inconel600were analyzed to investigate the working hardening behavior.The constitutive parameters of three constitutive equations,i.e.,the Hollomon,Swift and Voce equations,were compared by using different methods.A new working hardening parameter was proposed to characterize the working hardening behavior in different deformation stages.It is found that Voce equation is suitable to describe stress-strain curves in large strain region.Meanwhile,the predicting accuracy of ultimate tensile strength by Voce equation is the best.The working hardening behavior of SKH51is different from the other four metallic alloys.利用拉伸应力-应变曲线分析5种合金,SKH51、STS316L、Ti-6Al-4V、Al6061和Inconel600的加工硬化行为。通过Hollomon、Swift和Voce本构模型对材料的实验数据进行拟合、比较与加工硬化特征分析,提出新的预测拉伸变形各阶段加工硬化行为的表征参数及其在不同坐标体系下的表现形式。研究表明,Voce模型更适合用于描述大应变条件下的拉伸应力-应变关系,其预测抗拉强度的精度高于Hollomon和Swift模型。另外,SKH51合金在拉伸变形过程中出现的加工硬化行为明显异于其他4种合金。

关 键 词：constitutive equation tensile stress-strain behavior piecewise fitting coordinate transformation 

分 类 号：TG131[一般工业技术—材料科学与工程]