王文芳,潘红波,赵淮北,崔江涛,韩爱侠,汪杨

• 1:安徽江淮福臻车体装备有限公司
• 2:安徽工业大学冶金工程与资源利用安徽省重点实验室
• 3:上海大学材料科学与工程学院

摘要(Abstract)：

为研究碳、硅、锰等合金元素对热轧态中锰钢组织及力学性能的影响,设计了4种不同合金成分的热轧态中锰钢,并对其进行620℃退火10 h的热处理。利用扫描电镜(SEM)、X射线衍射(XRD)和拉伸试验等研究了实验钢的显微组织、残留奥氏体体积分数和单轴拉伸性能。结果表明:4种热轧态实验钢在退火过程中都发生奥氏体逆相变,获得了一定量的残留奥氏体组织,0.11C-7.05Mn-0.27Si钢的残留奥氏体的体积分数最高,达到49.64%。0.22C-4.87Mn-0.25Si钢的综合力学性能最优,其抗拉强度(R_m)为1024.48 MPa,断后伸长率(A_(50))为30.74%,强塑积(R_m×A)为31.49 GPa·%。分析认为,随着合金元素C、Mn含量的增加,退火后中锰钢中的残留奥氏体的体积分数增加,但伸长率与奥氏体的体积分数不一定成正比,主要还受残留奥氏体的稳定性的影响。另外,硅元素主要用于中锰钢的合金化。热轧态中锰钢获得超高强度、高塑性及高强塑积的主要原因还是残留奥氏体的TRIP效应以及超细晶铁素体或马氏体的细晶强化效应。

关键词(KeyWords)： 热轧中锰钢;合金元素;残留奥氏体;力学性能;TRIP效应

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51774006,U1860105)

作者(Author): 王文芳,潘红波,赵淮北,崔江涛,韩爱侠,汪杨

DOI: 10.13289/j.issn.1009-6264.2020-0438

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