奥氏体量及预应变量对0.1C-4.98Mn中锰钢力学性能的影响

特殊钢 ›› 2021, Vol. 42 ›› Issue (4): 71-74.

奥氏体量及预应变量对0.1C-4.98Mn中锰钢力学性能的影响

张磊^1,2，吴泽启¹，王存宇²，王建新¹，阎金刚¹，张建军¹

1. 唐山工业职业技术学院，唐山 063200；
2. 钢铁研究总院，北京 100081；

收稿日期:2021-01-18 出版日期:2021-07-15 发布日期:2022-03-09
通讯作者:
作者简介:张磊(1990-)，女，硕士(2018年北京科技大学)，讲师, 2015年内蒙古工业大学(本科)毕业,金属材料基础方面研究。E-mail: ustbzhanglei@163.com
基金资助:
国家重点研发计划（2017YFB0304400）；
院科研规划项目（YJKT201978）；
河北省教育厅高等学校科学技术研究项目（Z2020108）；
河北省教育厅高等学校科学技术研究项目（Z2019087）

Effect of Austenite Volume and Pre-Strain on Mechanical Properties of 0.1C-4.98Mn Medium Manganese Steel

Zhang Lei^1,2,Wu Zeqi¹,Wang Cunyu²,Wang Jianxin¹, Yan Jingang¹ , Zhang Jianjun¹

1. Tangshan Polytechnic College, Tangshan 063200；
2. Central Iron and Steel Research Institute, Beijing 100081;

Received:2021-01-18 Published:2021-07-15 Online:2022-03-09

摘要/Abstract

摘要： 采用610℃5h炉冷和800℃20 min水淬+625℃12 h空冷两种热处理工艺和0～20%拉伸预应变等试验方法,分析了 6.9%和13.6%两种奥氏体量及0～20%预应变量对中锰钢5 mm板力学性能变化的影响。利用XRD试验法测量奥氏体的体积分数,拉伸试验法测量力学性能。研究结果表明:在同一预应变量下,奥氏体体积分数为13.6%的试样与6.9%的试样相比,屈服强度低约30 MPa、抗拉强度高约40 MPa、屈强比小约0.1、总延伸率约大7个百分点、加工硬化效果更明显等。而在同一奥氏体量水平下,随预应变量增大,屈服强度、抗拉强度和屈强比都提高、总伸长率下降;且随真应变增大,加工硬化行为可分为四个阶段:减小(Ⅰ阶段)、增大(Ⅱ阶段)、几乎不变(Ⅲ阶段)、减小(Ⅳ阶段)。

关键词: 0.1C-4.98Mn中锰钢, 预应变量, 奥氏体, 力学性能, 加工硬化行为

Abstract: The change influence of 6.9% and 13.6% two austenite contents and 0 ~ 20% pre-strain process on mechanical properties of medium manganese steel 5 mm plate is analyzed by the test method of 610℃ 5 h furnace cooling and 800℃ 20 min W. C. +625 ℃ 12 h A. C. two heat treatment and 0 ~20% pre-strain process. The amount of retained austenite in the steel is determined by X-ray diffraction analysis and its mechanical properties are measured by tensile test. Research results show that at the same pre-strain level,compared to the sample with 6.9% austenite volume fraction,the sample with 13.6% austenite volume fraction has lower yield strength by about 30 MPa,higher tensile strength about 40 MPa,lower yield strength ratio by about 0.1,higher total elongation by about 7 percentage point,and more obvious work hardening behavior. At the same austenite content,with the increasing of pre-strain,the yield strength,tensile strength and yield-strength ratio increase,the total elongation decreases. With the increasing of true strain,the work hardening behavior can be divided into four stages:decreasing (stage I) increasing (stage II) ,almost unchanged (stage III) and decreasing (stage IV).

张磊, 吴泽启, 王存宇, 王建新, 阎金刚, 张建军. 奥氏体量及预应变量对0.1C-4.98Mn中锰钢力学性能的影响[J]. 特殊钢, 2021, 42(4): 71-74.

Zhang Lei, Wu Zeqi, Wang Cunyu, Wang Jianxin, Yan Jingang, Zhang Jianjun. Effect of Austenite Volume and Pre-Strain on Mechanical Properties of 0.1C-4.98Mn Medium Manganese Steel[J]. Special Steel, 2021, 42(4): 71-74.

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