Strain hardening behavior and deformation substructure of Fe–20/27Mn–4Al

Fe～20/27Mn～4Al～0.3C非磁钢的应变硬化行为及变形亚结构

DOI：

10.1016/j.matdes.2015.12.038

发表时间：

2016-02

期刊：

Materials & Design

影响因子：

8.4

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Ma Biao;Li Changsheng;Zheng Jianjun;Song Yanlei

研究了Fe-20/27 Mn-4Al-0.3C无磁钢的应变硬化行为与形变亚结构演化的关系，包括位错亚结构、机械孪晶和微带的形成。还估计了孪生和微带的临界应力。当层错能提高到中低水平时，通过降低孪晶体积分数和增大孪晶平均间距，大大降低了孪晶激活，使应变硬化速率主要受位错强化控制，在整个拉伸变形过程中呈现单调快速下降的趋势。此外，孪晶生成量的减少加剧了晶粒内部的变形不均匀性，这可能是沿着畴界形成优先微带的原因。

The association of strain hardening behavior with deformation substructure evolution, including dislocation substructures, mechanical twinning and microbands formation, was investigated in Fe–20/27Mn–4Al–0.3C non-magnetic steels. The critical stress for both twinning and microbanding were also estimated. With stacking fault energy enhanced to low-to-medium level, twin activation was largely diminished by reducing twin volume fraction and increasing their average spacing, such that the strain hardening rate was controlled mainly by dislocation strengthening and consequently presented a monotonous and rapid drop during entire tensile deformation process. In addition, the aggravated deformation heterogeneity in grain interior by less twin generation probably contributed to the preferential microbands formation along domain boundaries.