Effect of quenching mode on microstructure and properties of Ti-microalloyed medium carbon steel

doi:10.13251/j.issn.0254-6051.2021.06.023

Abstract

Abstract: A Ti-microalloyed medium carbon steel was designed, and after controlled rolling, the tested steel was conducted by different heat treatment processes, that was online direct quenching+tempering at low temperature (DQ+LT) and off-line reheat quenching+tempering at low temperature (RQ+LT). By using mechanical properties testing and microstructure observation, effect of quenching mode (DQ and RQ) on microstructure and precipitates of the Ti microalloyed medium carbon steel was studied. The results show that the quenching mode has a significant effect on microstructure and mechanical properties of the tested steel. The grain morphology quenched by DQ and RQ processes is flat and equiaxed, respectively. The flattened martensite lath is slender and directional, and the matrix dislocation density is high. The effective grain size of equiaxed grains is finer, the martensite lath in the grain is uniform and non-directional, and there are a lot of fine carbides and (Ti, Mo)C precipitates in the matrix. Due to the microstructure difference, the tested steel treated by DQ process has some shortcomings, such as uneven transverse and longitudinal performance and poor impact property at low temperature, etc. While the tested steel treated by RQ process has uniform transverse and longitudinal performance and the good match of strength and toughness.

Key words: direct quenching, off-line reheat quenching, low-temperature tempering, martensite lath, precipitates, effective grain size

CLC Number:

TG156.31

Wang Cheng, Guo Hongli, Sun Jian, Li Defa. Effect of quenching mode on microstructure and properties of Ti-microalloyed medium carbon steel[J]. Heat Treatment of Metals, 2021, 46(6): 111-115.

References

[1]Ma X P, Li X D, Langelier B, et al. Effects of carbon variation on microstructure evolution in weld heat-affected zone of Nb-Ti microalloyed steels[J]. Metallurgical and Materials Transactions A, 2018, 49: 4824-4832.
[2]Hu J, Du L X, Ma Y N, et al. Effect of microalloying with molybdenum and boron on the microstructure and mechanical properties of ultra-low-C Ti bearing steel[J]. Materials Science and Engineering A, 2015, 640: 259-266.
[3]孟征兵, 吴光亮, 刘新彬, 等. N-Ti微合金化高强钢中的含Ti析出物[J]. 材料热处理学报, 2014, 35(4): 106-110.
Meng Zhengbing, Wu Guangliang, Liu Xinbing, et al. Precipitates containing titanium in a nitrogen and titanium micro-alloyed high strength steel [J]. Transaction of Materials and Heat Treatment, 2014, 35(4): 106-110.
[4]陈颜堂, 郭爱民, 李平和. Nb-Ti微合金化超低碳低合金高强度钢中第二相的析出行为[J]. 金属热处理, 2007, 32(9): 51-54.
Chen Yantang, Guo Aimin, Li Pinghe. Nitride and carbonitride precipitation behavior in a Nb-Ti microalloyed extra low carbon HSLA steel[J]. Heat Treatment of Metals, 2007, 32(9): 51-54.
[5]李大赵, 庄治华, 申丽媛, 等. 先进高强钢微观组织调控研究现状及发展趋势[J]. 金属热处理, 2019, 44(5): 12-17.
Li Dazhao, Zhuang Zhihua, Shen Liyuan, et al. Research status and development trend of microstructure control of advanced high strength steel[J]. Heat Treatment of Metals, 2019, 44(5): 12-17.
[6]Deng X, Wang Z, Misra R, et al. Transformation and precipitation behaviour of Ti-Mo bearing high strength medium-carbon steel[J]. Materials Science and Technology, 2013, 29(9): 1111-1117.
[7]谭新伟, 郭成佺. Ti含量对高强钢奥氏体区中碳化物析出行为的影响[J]. 金属热处理, 2015, 40(2): 26-31.
Tan Xinwei, Guo Chengquan. Effects of Ti content on precipitation behavior of carbides in austenite of high strength steel[J]. Heat Treatment of Metals, 2015, 40(2): 26-31.
[8]张利平, 刘艳林, 韩杰, 等. 冷却工艺对Ti微合金高强钢组织和性能的影响[J]. 金属热处理, 2016, 41(1): 74-78.
Zhang Liping, Liu Yanlin, Han Jie, et al. Effect of cooling process on microstructure and properties of Ti-microalloyed high strength steel[J]. Heat Treatment of Metals, 2016, 41(1): 74-78.
[9]Hong S G, Yong W K, Kim J H, et al. Effects of rolling temperature on the microstructure and mechanical properties of Ti-Mo microalloyed hot-rolled high strength steel[J]. Materials Science and Engineering A, 2014, 605: 244-252.
[10]樊超, 杨忠民, 陈颖, 等. 铌钛与铌钒微合金化钢的高温塑性[J]. 金属热处理, 2018, 43(1): 28-32.
Fan Chao, Yang Zhongmin, Chen Ying, et al. High temperature plasticity of Nb-Ti and Nb-V microalloyed steel[J]. Heat Treatment of Metals, 2018, 43(1): 28-32.
[11]Hu B H, Cai Q W, Wu H B. Effect of Mo on the amount of Ti(C, N) precipitated from austenite in Ti-Mo micro-alloy steel[J]. Journal of University of Science and Technology Beijing, 2013, 35(4): 481-488.

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