准静态加载下时效态Inconel 718薄板的各向异性屈服准则及硬化模型构建  

Anisotropic Yield Criterion and Hardening Model Construction of Aging Inconel 718 Sheet Under Quasi-static Loading

作　　者：刘艳雄 纪开盛 张怡俊 尹飞 Liu Yanxiong;Ji Kaisheng;Zhang Yijun;Yin Fei(Hubei Key Laboratory of Advanced Technology for Automotive Components,Wuhan 430070,China;Hubei Engineering Research Center for Green Precision Material Forming,Wuhan 430070,China;Hubei Key Collaborative Innovation Center for Automotive Components Technology,Wuhan 430070,China)

机构地区：[1]湖北省汽车零部件先进技术重点实验室,湖北武汉430070 [2]湖北省绿色精密材料成型工程研究中心,湖北武汉430070 [3]湖北省汽车零部件重点协同创新中心,湖北武汉430070

出　　处：《稀有金属材料与工程》2022年第9期3297-3306,共10页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2020YFA0714900)。

摘　　要：当金属件的特征尺寸缩小到微尺度时,会产生尺寸效应,从而使对微成形的理解变得复杂。本研究以0.1mm厚的时效态Inconel 718薄板为研究对象,对其进行了力学性能测试。基于力学测试数据,探究了时效态Inconel 718薄板在相同应变速率、不同拉伸方向上各向异性、延伸率、屈服强度及最大抗拉强度的变化规律,并建立了介微观尺度下各向异性及屈服强度的预测模型和考虑应变量及应变速率的准静态硬化模型。结果表明:时效态Inconel 718薄板具有明显的各向异性,其延伸率以45°为极值点呈现先增大后减小的变化规律,屈服强度和最大抗拉强度的变化规律与之相反。由于尺寸效应的存在需要2组不同的材料参数对各向异性及屈服强度进行预测。当应变速率大于0.1 s^(-1)时,材料屈服强度表现出明显的应变速率敏感性,该硬化模型不再适用。The deformation mechanism will be more intricate by the size effect when the cha racteristic size of metal parts is reduced to a micro scale.In this paper,the aging Inconel 718 foil with thickness of 0.1 mm was selected as the study subject and its mec hanical properties were tested.Based on the mechanical test data,the anisotropy,elongation,yield strength and maximum tensile strength of aging Inconel 718 sheets were explored under different tensile directions and uniform strain rates.And the predicted model of anisotropy and yield strength and the hardening model considering the strain and strain rate were established.The results show that the aging Inconel 718 sheets have conspicuous anisotropy.The tensile direction of 45° is an extreme point for the anisotropy,elongation,yield strength and maximum tensile strength.The elongation and anisotropy firstly increases and then decreases with the increase of angle between tensile direction and rolling direction.But the change rule of yield strength and maximum tensile strength is opposite to elongation and anisotropy.In order to accurately predict the anisotropy and yield strength,two different sets of material parameters are needed due to the size eff ect.When the strain rate is higher than 0.1 s^(-1),the material yield strength shows obvious sensitivity for strain rate.In this mo ment,the above hardening model is not applicable.

关 键 词：亚毫米尺度 时效态Inconel 718 各向异性 屈服强度 硬化模型 

分 类 号：TG132.33[一般工业技术—材料科学与工程]