亚稳态材料的应变硬化曲线与硬化参量  

Strain hardening curve and parameters of metastable materials

作　　者：张旺峰[1] 陈瑜眉[1] 朱金华[1] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049

出　　处：《中国有色金属学报》2000年第S1期236-238,共3页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金!资助项目 ( 59771 0 4 8)

摘　　要：亚稳态奥氏体不锈钢低温拉伸时 ,由于存在应变诱发马氏体相变 ,硬化曲线呈S形。在工程应力应变曲线上每隔 1 .5%的应变区间利用Hollomon关系 ,发现硬化指数n随着应变率的增大而相应减小 ;且硬化指数n和硬化率dσ/dε随着应变的增加呈抛物线形变化。因此 ,稳定材料中关于n的一系列规律均不适用。The hardening curve exhibits sigmoid in metastable austenite stainless steel at low temperature due to strain induced martensite transformation during deformation. The values of hardening exponent, n , derived from Hollomon equation in each 1.5% of nominal curve are found not to be a constant, n values decrease correspondingly with increase of strain rate. Furthermore, both the n values and the hardening rate present parabola with increasing strain. So the relationships of n applied in stable materials can not be applied in metastable ones.

关 键 词：硬化曲线 硬化指数 硬化率 亚稳态材料 

分 类 号：TG113[金属学及工艺—物理冶金]