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试验与研究 DOI:10.11973/lhjy-wl230366
冷变形对超低碳贝氏体钢中逆转变奥氏体的影响
杨 颖 ,许媛媛 ,潘诗良 ,王泽民 1
1
2
3
(1.上海应用技术大学 材料科学与工程学院,上海 201418;2.南通高熵新材料科技有限公司,南通 226004;
3.上海朋泰机械科技有限公司, 上海 201406)
摘 要:采用硬度测试、拉伸试验、金相检验、X射线衍射测试、透射电镜检测、能谱分析等方法
研究形变对超低碳贝氏体钢中逆转变奥氏体和力学性能的影响。结果表明:随着冷轧变形量的增大,
超低碳贝氏体钢的硬度与强度呈显著增大趋势;超低碳贝氏体钢中的奥氏体体积分数从未变形时的
0.4%逐渐增大到变形量为90%时的14.85%;钢中的逆转变奥氏体主要分布在晶界处,其形态由未
变形时的薄膜状向块状转变;奥氏体中的Ni元素和Mn元素质量分数随变形量的增大而减小,Ni元
素质量分数由未变形时的59%下降到变形量为90%时的11.64%,Mn元素质量分数由未变形时的
16%下降到变形量为90%时的3.48%。
关键词: 超低碳贝氏体钢;冷轧变形量;逆转变奥氏体;Ni元素和Mn元素;形态
中图分类号:TG142.25;TG115.2 文献标志码:A 文章编号:1001-4012(2024)08-0016-07
Effect of cold deformation on reversed austenite in ultra-low carbon bainitic steel
YANG Ying , XU Yuanyuan , PAN Shiliang , WANG Zemin 1
3
2
1
(1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;
2. Nantong High Entropy New Material Technology Co., Ltd., Nantong 226004, China;
3. Shanghai Pengtai Machinery Technology Co., Ltd., Shanghai 201406, China)
Abstract: The effects of deformation on the reversed austenite and mechanical properties of ultra-low carbon
bainitic steel were studied by means of hardness test, tensile test, metallographic examination, X-ray diffraction test,
transmission electron microscopy and energy spectrum analysis. The results show that the hardness and strength of
ultra-low carbon bainitic steel increased significantly with the increase of cold rolling reduction. The volume fraction of
austenite in ultra-low carbon bainitic steel gradually increased from 0.4% to 14.85% when the deformation was 90%.
The reversed austenite in the steel was mainly distributed at the grain boundary, and its morphology changed from film-
like to block-like. The mass fraction of Ni and Mn in austenite decreased with the increase of deformation. The mass
fraction of Ni decreased from 59% to 11.64% when the deformation was 90%, and the mass fraction of Mn decreased
from 16% to 3.48% when the deformation was 90%.
Keywords: ultra-low carbon bainitic steel; cold rolling reduction; reverse austenite; Ni element and Mn element;
form
超低碳贝氏体钢是一种高强度、高韧性、多用途 领域 [1-3] 。钢的高强度可以通过细化晶粒,提高位错
的钢,广泛应用于交通运输、基础设施、国防工业等 密度,优化第二相的数量、尺寸和分布等方法来实
现 。然而,钢的韧性也是重要的性能指标,尤其是
[4]
钢在低温环境下的韧性很大程度上取决于回火过程
收稿日期:2023-12-19
基金项目:国家重点研发计划项目(NO.2017YFB0304501);上 中逆转变奥氏体的含量、分布及稳定性 [5-6] 。逆转变
海科委项目(16090503600) 奥氏体可以通过局部相变诱发塑性、裂纹尖端钝化
作者简介:杨 颖(1997—),女,硕士,主要研究方向为超低碳 [7-8]
效应和“净化基体”等机制提高钢材的低温韧性 。
贝氏体钢的组织与性能
在实现碳排放减少和能源消耗降低的“双碳”
通信作者:王泽民(1984—),博士,高级实验师,主要研究方向
为高性能金属材料的微观结构与性能,wzm@sit.edu.cn 战略目标下,超低碳贝氏体钢的生产流程面临着降
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