316L不锈钢室温和高温单轴循环塑性流动特性分析

Analysis for Plastic Flow Characteristic under Uniaxial Cyclic Loading at Room and High Temperature of 316L Stainless Steel

在 316L不锈钢室温、高温单轴应变控制和应力控制下的系统循环试验结果基础上，对两种控制模式下循环过程中的塑性流动特性进行了定量分析。揭示和分析了循环应变幅值、平均应变、温度及其历史与应变循环下以及应力幅值、平均应力、温度及其历史与应力循环下塑性模量演变规律之间的关系和影响。研究中着重讨论了循环棘轮行为与塑性模量和累积塑性应变之间的关系。研究表明，应变循环中塑性模量的演变规律明显不同于非对称应力循环，室温和高温下非对称应力循环中的棘轮效应由塑性模量和累积塑性应变的演变规律共同决定。

： Based on the experimental results of 316L stainless steel subjected to uniaxial strain and stress cycling at room and high temperature,the properties of plastic flow of material were quantitatively analyzed.In this paper,the effects of cyclic strain amplitude,mean strain,temperature and their histories on the evolution rule of plastic modulus under strain cycling are investigated.And,the influences of stress amplitude,mean stress,temperature and their histories on the evolution rule of plastic modulus under stress cycling are also analyzed.The discussion is focused on the relation of ratcheting to the plastic modulus and accumulated plastic strain.It is shown that the properties of plastic flow of strain cycling are apparently different with that of asymmetrical stress cycling,the ratcheting of asymmetrical stress cycling at room and high temperature is decided by the evolution of plastic modulus and accumulated plastic strain.