亚稳态材料的应变硬化曲线与硬化参量
来源期刊：中国有色金属学报2000年第z1期
论文作者：张旺峰 陈瑜眉 朱金华
文章页码：236 - 238
关键词：硬化曲线； 硬化指数； 硬化率； 亚稳态材料
Key words：hardening curve； hardening exponent； hardening rate； metastable materials
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。
Abstract: 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.
