Research on quenching grain control and tensile properties of 22MnB5 steel

doi:10.13251/j.issn.0254-6051.2020.11.025

Abstract

Abstract: To improve the strength and plasticity of the hot stamping steel, the 22MnB5 steel was heated at 830-920 ℃ by a DIL805A thermal dilatometer and held for 2-20 min, and then quenched after austenitizing. The prior austenite grains were observed by optical microscope. According to the characteristics of grain growth, the tensile properties of the 22MnB5 steel plate were tested by uniaxial tensile test after quenching and tempering. The results show that uniformly fine austenite grains can be obtained by austenitizing at 830-890 ℃ and within 10 min of effective holding for the 22MnB5 steel. While when the effective holding time is extended to 20 min, the mixed grain microstructure begins to appear when austenitized at 860 ℃. Compared with the traditional hot stamping process, the strength and plasticity of 22MnB5 steel is significantly improved by controlling the quenching grains, and the product of strength and elongation increases from 9.0-11.0 GPa·% to 13.0-14.5 GPa·%.

Key words: 22MnB5 steel, quenching and tempering, grain size, product of strength and elongation

CLC Number:

TG142.1

Li Suyun, Pei Yiding, Li Qi, Xu Peiyao, Gong Xiumian, Min Yong'an. Research on quenching grain control and tensile properties of 22MnB5 steel[J]. Heat Treatment of Metals, 2020, 45(11): 138-143.

References

[1]张杰, 江社明, 张启富, 等. 加热工艺对22MnB5钢板组织和力学性能的影响[J]. 热加工工艺, 2014, 43(14): 204-206.
Zhang Jie, Jiang Sheming, Zhang Qifu, et al. Effect of heating process on microstructure and mechanical properties of 22MnB5 steel[J]. Hot Working Technology, 2014, 43(14): 204-206.
[2]姜超, 单忠德, 庄百亮, 等. 热冲压成形22MnB5钢板的组织和性能[J]. 材料热处理学报, 2012, 33(3): 78-81.
Jiang Chao, Shan Zhongde, Zhuang Bailiang, et al. Microstructure and properties of hot stamping 22MnB5 steel[J]. Transactions of Materials and Heat Treatment, 2012, 33(3): 78-81.
[3]盈亮, 余洋, 戴明华, 等. 热冲压快速冷却工艺对22MnB5钢组织与性能的影响[J]. 金属热处理, 2015, 40(1): 35-38.
Ying Liang, Yu Yang, Dai Minghua, et al. Influence of hot stamping RCP process on microstructure and properties of 22MnB5 steel[J]. Heat Treatment of Metals, 2015, 40(1): 35-38.
[4]宋磊峰, 马鸣图, 张宜生, 等. 热冲压成形新型B钢开发与工艺研究[J]. 中国工程科学, 2014, 16(1): 71-75.
Song Leifeng, Ma Mingtu, Zhang Yisheng, et al. New boron steel development and process research of hot stamping[J]. Strategic Study of CAE, 2014, 16(1): 71-75.
[5]胡宽辉, 毛新平, 周桂峰, 等. Si和Mn含量对超高强度热成形钢组织和性能的影响[J]. 金属学报, 2018, 54(8): 1105-1112.
Hu Kuanhui, Mao Xinping, Zhou Guifeng, et al. Effect of Si and Mn contents on the microstructure and mechanical properties of ultra-high strength press hardening steel[J]. Acta Metallurgica Sinica, 2018, 54(8): 1105-1112.
[6]刘安民, 冯毅, 赵岩, 等. 铌钒微合金化对22MnB5热成形钢显微组织与性能的影响[J]. 机械工程材料, 2019, 43(5): 34-37, 53.
Liu Anmin, Feng Yi, Zhao Yan, et al. Effect of niobium and vanadium micro-alloying on microstructure and property of 22MnB5 hot press forming steel[J]. Materials for Mechanical Engineering, 2019, 43(5): 34-37, 53.
[7]贺迪, 陈霞. 一种新型热冲压钢的组织和性能研究[J]. 热加工工艺, 2017, 46(19): 163-166.
He Di, Chen Xia. Study on microstructure and properties of a new type hot stamping steel[J]. Hot Working Technology, 2017, 46(19): 163-166.
[8]Taylor T, Fourlaris G, Clough A. Effect of carbon and microalloy additions on hot-stamped boron steel[J]. Materials Science and Technology, 2017, 33(16): 1964-1977.
[9]Lin Li, Kang Yonglin, Liu Rendong, et al. Effect of niobium precipitation behavior on microstructure and hydrogen induced cracking of press hardening steel 22MnB5[J]. Materials Science and Engineering A, 2018, 721: 38-46.
[10]Piotr Skubisz, Łukasz Lisiecki, Piotr Micek. Effect of direct cooling conditions on characteristics of drop forged Ti+V+B microalloy steel[J]. Procedia Manufacturing, 2015(2): 428-433.
[11]杨清, 张立文, 张驰, 等. 低碳Nb-V-Ti微合金钢X70的奥氏体晶粒长大行为[J]. 金属热处理, 2019, 44(4): 1-5.
Yang Qing, Zhang Liwen, Zhang Chi, et al. Austenite grain growth behavior of low carbon Nb-V-Ti microalloyed steel X70[J]. Heat Treatment of Metals, 2019, 44(4): 1-5.
[12]廖林镇, 杨庚蔚, 戴成珂, 等. 30CrMo钢的奥氏体晶粒长大行为及数学模型[J]. 上海金属, 2016, 38(6): 16-19, 26.
Liao Linzhen, Yang Gengwei, Dai Chengke, et al. Austenite grain growth behavior and mathematical model of 30CrMo steel[J]. Shanghai Metals, 2016, 38(6): 16-19, 26.
[13]王子孝. 奥氏体晶粒的两类长大机构及混晶的形成[J]. 武汉大学学报(自然科学版), 1979(4): 85-91.
[14]向嵩, 刘国权, 李长荣. 低碳钢碳氮析出物的热力学计算及其应用[C]// 2005年全国计算材料、模拟与图像分析学术会议论文集. 2005: 48-54.
[15]Satoru Matsuo, Teiichi Ando, Nicholas J Grant. Grain refinement and stabilization in spray-formed AISI 1020 steel[J]. Materials Science and Engineering A, 2000, 288(1): 34-41.
[16]李伟, 陈文琳, 吴跃, 等. 42CrMo钢加热时奥氏体晶粒长大演化规律[J]. 材料热处理学报, 2015, 36(1): 104-108.
Li Wei, Chen Wenlin, Wu Yue, et al. Austenite grain growth behaviour of 42CrMo steel during heating[J]. Transactions of Materials and Heat Treatment, 2015, 36(1): 104-108.
[17]方旭东, 王岩, 夏焱, 等. 淬火温度对SUP13Cr钢组织与性能的影响[J]. 金属热处理, 2018, 43(2): 187-190.
Fang Xudong, Wang Yan, Xia Yan, et al. Effect of quenching temperature on microstructure and properties of SUP13Cr steel[J]. Heat Treatment of Metals, 2018, 43(2): 187-190.
[18]Vuherer T, Milovic＇ L, Gliha V. Behaviour of small cracks during their propagation from Vickers indentations in coarse-grain steel: An experimental investigation[J]. International Journal of Fatigue, 2011, 33(12): 1505-1513.
[19]Naderi M, Abbasi M, Saeed-Akbari A. Enhanced mechanical properties of a hot-stamped advanced high-strength steel via tempering treatment[J]. Metallurgical and Materials Transactions A, 2013, 44(4): 1852-1861.
[20]程俊业, 赵爱民, 陈银莉, 等. 回火温度对淬火后30MnB5热成形钢组织与性能影响[J]. 北京科技大学学报, 2013, 35(9): 1150-1157.
Cheng Junye, Zhao Aimin, Chen Yinli, et al. Effect of tempering temperature on the microstructure and mechanical properties of 30MnB5 hot stamping steel after quenching[J]. Journal of University of Science and Technology Beijing, 2013, 35(9): 1150-1157.