Effect of Ti micro-alloying on microstructure and properties of 22MnB5 hot press forming steel

doi:10.13251/j.issn.0254-6051.2022.01.021

Abstract

Abstract: Through thermal expansion test, microstructure analysis and hardness test, the effect of cooling rate and Ti element on the phase transformation temperature, microstructure, precipitated phase and hardness of two 22MnB5 hot forming steels was analyzed, and then the CCT curves was obtained. The results show that the microstructure of the tested steels are composed of ferrite and pearlite when the cooling rate is lower than 5 ℃/s; bainites appear when the cooling rate reaches 5 ℃/s, and the transformation products are totally martensites when the cooling rate reaches 30 ℃/s. Ti micro-alloying deceases the Ms temperature, and the precipitation of Ti(C, N) phase refines the austenite grain size and therefore the lath martensites, which improves the strength of the tested steel by the effects of precipitation strengthening and fine grain strengthening.

Key words: cooling rate, titanium, hot press forming steel, CCT curve

CLC Number:

TG142.1

Zhu Henan, Chen Gang, Yang Jiawei, Zhang Zhijian. Effect of Ti micro-alloying on microstructure and properties of 22MnB5 hot press forming steel[J]. Heat Treatment of Metals, 2022, 47(1): 125-129.

References

[1]Maeno T, Mori K I, Nagai T. Improvement in formability by control of temperature in hot stamping of ultra-high strength steel parts[J]. CIRP Annals, 2014, 63(1): 301-304.
[2]王伟. 汽车车门轻量化及侧面碰撞安全性能研究[D]. 重庆: 重庆交通大学, 2014.
Wang Wei. A study on the car door light weighting and the safety of side crashsimulation[D]. Chongqing: Chongqing Jiaotong University, 2014.
[3]赵征志, 陈伟健, 高鹏飞, 等. 先进高强度汽车用钢研究进展及展望[J]. 钢铁研究学报, 2020, 32(12): 1059-1076.
Zhao Zhengzhi, Chen Weijian, Gao Pengfei, et al. Progress and perspective of advanced high strength automotive steel[J]. Journal of Iron and Steel Research, 2020, 32(12): 1059-1076.
[4]路洪洲, 赵岩, 冯毅, 等. 微合金化热成形钢开发应用进展及展望[J]. 机械工程材料, 2020, 44(12): 1-10.
Lu Hongzhou, Zhao Yan, Feng Yi, et al. Progress and prospect for development and application of microalloying press-hardening steel[J]. Materials for Mechanical Engineering, 2020, 44(12): 1-10.
[5]陈响军. 金属材料微观组织演变计算方法及在热成型中的应用[D]. 长沙: 湖南大学, 2016.
Chen Xiangjun. Numerical calculation method of microstructure evolution of metal materials and its application in hot stamping[D]. Changsha: Hunan University, 2016.
[6]汪思敏, 胡志华, 王正云, 等. 回火温度对汽车用22MnB5钢组织和性能的影响[J]. 金属热处理, 2020, 45(7): 32-36.
Wang Simin, Hu Zhihua, Wang Zhengyun, et al. Effect of tempering temperature on microstructure and properties of 22MnB5 steel for automobile[J]. Heat Treatment of Metals, 2020, 45(7): 32-36.
[7]黄春峰. 钢的力学性能及热处理工艺经验公式[J]. 热处理, 1998(4): 12-17.
Huang Chunfeng. Empirical formulas of mechanical properties of steels and heat treatment processing[J]. Heat Treatment, 1988(4): 12-17.
[8]林乙丑, 张彦敏, 张广威, 等. 1.25Cr0.5MoSiNb钢过冷奥氏体连续冷却转变[J]. 材料热处理学报, 2021, 42(1): 119-125.
Lin Yichou, Zhang Yanmin, Zhang Guangwei, et al. Continuous cooling transformation of supercooled austenite of 1.25Cr0.5MoSiNb steel[J]. Transactions of Materials and Heat Treatment, 2021, 42(1): 119-125.
[9]程俊业, 赵爱民, 陈银莉, 等. Ti对热冲压成形用钢中马氏体相变的影响[C]//第八届(2011)中国钢铁年会论文集. 中国金属学会, 2011: 701-706.
Cheng Junye, Zhao Aimin, Chen Yinli, et al. Effect of Ti addition on martensite transformation in hot stamping steel[C]//Proceedings of the 8^th(2011) China Iron and Steel Annual Conference. Chinese Society of Metals, 2011: 701-706.
[10]马鸣图, 蒋松蔚, 李光瀛, 等. 热冲压成形钢的研究进展[J]. 机械工程材料, 2020, 44(7): 1-7, 27.
Ma Mingtu, Jiang Songwei, Li Guangying, et al. Research progress on hot stamping steel[J]. Materials for Mechanical Engineering, 2020, 44(7): 1-7, 27.

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