基于Crussard-Jaoul的n值分析对高锰钢加工硬化机制的探讨  

Investigation of work hardening mechanism in high manganese steel by Crussard-Jaoul analysis

作　　者：王兆昌[1] 文玉华[1] 李宁[1] 赖志伟[1] 

机构地区：[1]四川大学材料成型及控制工程系,四川成都610065

出　　处：《机械》2008年第7期71-74,共4页Machinery

摘　　要：通过研究发现Crussard-Jaoul分析法能够精确反映高锰钢变形过程中加工硬化的特点。基于Crussard-Jaoul分析法所得的高锰钢应变硬化指数值的变化主要受位错密度和孪晶体积分数的影响,尤其随着形变孪晶量的增加,应变硬化指数获得迅速提高。当应变量低于0.1,高锰钢塑性变形以位错滑移为主要机制;当应变量超过形变孪晶产生的临界应变（0.06~0.08）后,高锰钢塑性变形以位错滑移和机械孪生两种方式进行。孪晶的产生能迅速提升高锰钢加工硬化性能,而仅位错强化不能使高锰钢获得优异的加工硬化性能。Crussard-Jaoul分析法能对金属塑性变形和加工硬化机制进行判断和预测。The work hardening behavior of high manganese steel could be characterized accurately by the Crussard-Jaoul analysis. The results showed that the strain hardening exponent, determined by the Crussard-Jaoul analysis, was affected by dislocation density and twin volume fraction, especially, it was increased greatly with twin. When the strain was less than 0.1, high manganese steel was deformed by dislocations sliping. When the strain was greater than a critical strain （0.06-0.08） over which twinning began to take place, high manganese steel was deformed by sliping and twinning. The occurrence of twining can remarkably increase the work hardening properties, which was not attained only by dislocation multiplication and interaction. Through Crussard-Jaoul analysis, we can predict and judge the mechanism of deformation and work hardening.

关 键 词：高锰钢 加工硬化 应变硬化指数 Crussard-Jaoul分析法 位错 孪晶 

分 类 号：TG142.72[一般工业技术—材料科学与工程]