权国政,陈涛,余春堂,王阳,周杰

• 1:重庆大学材料科学与工程学院

摘要(Abstract)：

通过挤压态42CrMo钢多组试样的热压缩实验获得应变速率为0.01～10 s-1、变形温度为1123～1148 K条件下的真应力-应变数据,以此作为计算应变速率敏感指数(m值)﹑能量耗散因子(η值)和失稳判据(ζ值)三重判据的底层材料数据。利用三重判据构建的加工图对挤压态42CrMo高强度钢的热成形过程进行分析,得到了挤压态42CrMo强度钢在成型过程中的稳定区域和流变失稳区。结果表明:42CrMo钢的最优变形热力参数处于具有较高η值和较高ξ值的区域内。

关键词(KeyWords)： 应变速率敏感指数;能量耗散系数;失稳判据;加工图

Abstract:

Keywords:

基金项目(Foundation): 科技部国家重大专项项目(2010ZX04010-081,G09003.8-1);; 重庆市重大科技攻关项目(cstc2009aa3012-1);; 重庆大学大型仪器设备开放基金(2011063014)

作者(Author): 权国政,陈涛,余春堂,王阳,周杰

DOI: 10.13289/j.issn.1009-6264.2013.02.018

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