锻压技术

Mn含量对车梁用高锰奥氏体TWIP钢拉伸变形行为的影响

英文标题：Influence of Mn content on tensile deformation behavior of high manganese austenite TWIP steel for vehicle beams

作者：王雪于秀涛

单位：黄河交通学院

分类号：TG142.1

出版年,卷(期):页码：2019,44(9):151-155

摘要：

以两种Mn含量（质量分数为10.5%和18.5%）的车梁用高锰奥氏体TWIP钢作为研究对象，通过室温拉伸实验、TEM、SEM等测试手段，分析其力学特性、组织孪生特征与加工硬化过程。研究结果表明：Mn含量上升会引起钢材强度降低、伸长率上升、DSA减小。两种高锰钢发生应变硬化过程可分成4个阶段，Fe-18.5Mn高锰钢可以比Fe-10.5Mn高锰钢在更宽的应变范围中保持很高的应变硬化率。在应变0.1下，Fe-10.5Mn高锰钢中部分晶粒转变为孪晶，但Fe-18.5Mn高锰钢只存在少数晶粒转变为孪晶；应变达到0.2时，两种钢的孪晶都以更快速率生成，Fe-18.5Mn高锰钢具有更少的孪晶量。钢材基体中有单个孪晶存在于孪晶束中，Fe-10.5Mn高锰钢的孪晶平均厚度和相邻孪晶间距平均值都小于Fe-18.5Mn高锰钢，其形成了更加致密的孪晶排列状态。

For the high manganese austenite TWIP steels with two kinds of Mn contents (mass fraction of 10.5% and 18.5%) for vehicle beams, the mechanical properties, tissue twinning characteristics and work-hardening process were analyzed by room temperature tensile experiment, TEM, SEM and other testing methods. The results show that the increasing of Mn content leads to the decreasing of strength, the increasing of elongation and the decreasing of DSA. Then, the strain hardening process of two kinds of high manganese steels is divided into four stages, and Fe-18.5Mn high manganese steel keeps high strain hardening rate in a wider strain range than that of Fe-10.5Mn high manganese steel. When the strain is 0.1, the partial grains in Fe-10.5Mn high manganese steel change into twin crystals, but only a few grains in Fe-18.5Mn high manganese steel change into twin crystals. When the strain reaches 0.2, the twin crystals of both steels generate at a faster rate, and Fe-18.5Mn high manganese steel has less twin crystals. Furthermore, a single twin crystal exists in the twin beam of the steel matrix, and the average thickness of the twin crystal and the average distance between adjacent twin crystals in Fe-10.5Mn high manganese steel are both smaller than those of Fe-18.5Mn high manganese steel, which forms a more compact twin arrangement state.

基金项目：

河南省科技攻关计划项目(154102310028)

王雪（1984-），女，学士，讲师 E-mail：pengwuhe131797@126.com

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