热轧工艺对65Mn钢显微组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.12.036

摘要/Abstract

摘要： 研究了热轧工艺对65Mn钢组织与性能的影响。采用电子探针显微分析仪(EPMA)和透射电镜(TEM)对热轧组织进行了表征。结果表明:通过控制热轧工艺,可获得珠光体和贝氏体两种初始组织。随着终轧温度和终冷温度的降低,先共析铁素体含量和珠光体体片层间距逐渐减小,强度、硬度逐渐升高。相比珠光体组织,热轧贝氏体组织具有更高的强度,抗拉和屈服强度分别为943 MPa 和648 MPa。

关键词: 65Mn钢, 热轧工艺, 珠光体, 片层间距, 性能

Abstract: Effect of hot rolling process on microstructure and mechanical properties of 65Mn steel was experimentally studied. Electron probe microanalyzer (EPMA) and transmission electron microscope (TEM) were used to characterize the hot-rolled microstructure. The results show that two initial structures of pearlite and bainite can be obtained by controlling the hot rolling process. With the decrease of final cooling temperature and final rolling temperature, the proeutectoid ferrite content and pearlite interlamellar spacing gradually decrease, and the strength and hardness gradually increase. Compared with pearlite, hot-rolled bainite has higher strength, with tensile and yield strengths of 943 MPa and 648 MPa, respectively.

Key words: 65Mn steel, hot rolling process, pearlite, interlamellar spacing, mechanical properties

中图分类号:

TG142.1

杨莹莹, 吴红艳, 齐敏, 杜林秀. 热轧工艺对65Mn钢显微组织及力学性能的影响[J]. 金属热处理, 2021, 46(12): 218-222.

Yang Yingying, Wu Hongyan, Qi Min, Du Linxiu. Effect of hot rolling on microstructure and properties of 65Mn steel[J]. Heat Treatment of Metals, 2021, 46(12): 218-222.

参考文献

[1]李秀景, 王淑华, 张星, 等. 薄板坯热连轧工艺对65Mn钢带组织和性能的影响[J]. 钢铁钒钛, 2020, 41(6): 158-163.
Li Xiujing, Wang Shuhua, Zhang Xing, et al. Effect of FTSR hot rolling process on microstructure and mechanical properties of 65Mn strip[J]. Iron Steel Vanadium Titanium, 2020, 41(6): 158-163.
[2]张星, 李秀景, 侯明山, 等. 薄板坯连铸连轧65Mn钢奥氏体晶粒长大规律[J]. 金属热处理, 2018, 43(11): 62-65.
Zhang Xing, Li Xiujing, Hou Mingshan, et al. Austenite grain growth behavior of 65Mn steel produced by FTSR process[J]. Heat Treatment of Metals, 2018, 43(11): 62-65.
[3]李海军, 李睿昊, 宫美娜, 等. 热芯大压下轧制连铸坯再加热时的组织遗传性[J]. 钢铁, 2020, 55(11): 140-145.
Li Haijun, Li Ruihao, Gong Meina, et al. Microstructure inheritance of continuous casting steel deformed by hot-core heavy reduction rolling technology during reheating process[J]. Iron and Steel, 2020, 55(11): 140-145.
[4]王定祥, 王世伟. 耐磨合金钢的回火脆性、变质处理及组织遗传性[J]. 铸造技术, 2020, 41(4): 370-374.
Wang Dingxiang, Wang Shiwei. Tempering brittleness, modification and microstructure heredity of wear resistant alloy steel[J]. Foundry Technology, 2020, 41(4): 370-374.
[5]李晓源, 时捷, 孙挺. 终轧温度对高氮奥氏体钢组织和力学性能的影响[J]. 中国冶金, 2020, 30(5): 29-34.
Li Xiaoyuan, Shi Jie, Sun Ting. Effects of finish rolling temperature on microstructure and mechanical properties of high nitrogen austenitic steel[J]. China Metallurgy, 2020, 30(5): 29-34.
[6]冯锐. 铁素体/珠光体型钢板内部质量及其影响因素研究[D]. 济南: 山东大学, 2013.
Feng Rui. Research on internal quality and its influencing factors of ferrite/pearlite steel plate[D]. Jinan: Shangdong University, 2013.
[7]邵春娟, 邵伟, 镇凡, 等. 控轧控冷工艺对X70级抗大变形管线钢组织与性能的影响[J]. 材料热处理学报, 2020, 41(3): 110-116.
Shao Chunjuan, Shao Wei, Zhen Fan, et al. Effect of controlled rolling and controlled cooling process on microstructure and mechanical properties of X70 pipeline steel[J]. Transactions of Materials and Heat Treatment, 2020, 41(3): 110-116.
[8]惠亚军, 刘锟, 吴科敏, 等. 卷取温度对500 MPa级热冲压桥壳用钢组织与力学性能的影响[J]. 金属学报, 2020, 56(12): 1605-1616.
Hui Yajun, Liu Kun, Wu Kemin, et al. Effect of coiling temperature on microstructure and mechanical properties of 500 MPa grade hot stamping axle housing steel[J]. Acta Metallurgica Sinica, 2020, 56(12): 1605-1616.
[9]Wang M, Zhang F, Yang Z. Effects of high-temperature deformation and cooling process on the microstructure and mechanical properties of an ultrahigh-strength pearlite steel[J]. Materials and Design, 2017, 114: 102-110.
[10]Seo S W, Bhadeshia H, Suh D W. Pearlite growth rate in Fe-C and Fe-Mn-C steels[J]. Materials Science and Technology, 2015, 31(4): 487-493.
[11]Li Z X, Li C S, Zhang J, et al. Effects of annealing on carbides size and distribution and cold formability of 1.0C-1.5Cr bearing steel[J]. Metallurgical and Materials Transactions A, 2015, 46(7): 3220-3231.
[12]Wang J, Shen Y, Liu Y, et al. Tailoring strength and ductility of a Cr-containing high carbon steel by cold-working and annealing[J]. Materials, 2019, 12(24): 4136.
[13]Offerman S E, Van Wilderen L, Van Dijk N H, et al. In-situ study of pearlite nucleation and growth during isothermal austenite decomposition in nearly eutectoid steel[J]. Acta Materialia, 2003, 51(13): 3927-3938.
[14]Hackney S A, Shiflet G J. The pearlite-austenite growth interface in an Fe-0.8C-12Mn alloy[J]. Acta Metallurgica, 1987, 35(5): 1007-1017.
[15]Zhang M X, Kelly P M. Crystallography and morphology of Widmanstátten cementite in austenite[J]. Acta Materialia, 1998, 46(13): 4617-4628.
[16]Zhang M X, Kelly P M. Accurate orientation relationships between ferrite and cementite in pearlite[J]. Scripta Materialia, 1997, 37(12): 2009-2015.
[17]刘宗昌. 珠光体转变与退火[M]. 北京: 化学工业出版社, 2007.
[18]张东桥. Fe-C合金热处理过程珠光体形核与协作生长数值模拟研究[D]. 武汉: 华中科技大学, 2017.
Zhang Dongqiao. Numerical simulation study on pearlite nucleation and cooperative growth during heat treatment for Fe-C alloy[D]. Wuhan: Huazhong University of Science and Technology, 2017.
[19]Liu Z Q, Miyamoto G, Yang Z G, et al. Volume fractions of proeutectoid ferrite/pearlite and their dependence on prior austenite grain size in hypoeutectoid Fe-Mn-C alloys[J]. Metallurgical and Materials Transactions A, 2013, 44(12): 5456-5467.
[20]Hyzak J M, Bernstein I M. The role of microstructure on the strength and toughness of fully pearlitic steels[J]. Metallurgical Transactions A, 1976, 7(8): 1217-1224.