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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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