Effect of nitrogen content on microstructure and properties of 25Mn2CrVS bainite type non-quenched and tempered steel

doi:10.13251/j.issn.0254-6051.2020.04.007

Abstract

Abstract: Effect of nitrogen content (mass fraction of 0.016%, 0.029% and 0.049% respectively) on the microstructure and mechanical properties of 25Mn2CrVS bainite type non-quenched and tempered steel was studied. The results show that the microstructure of all the tested steels consists of lath bainite, granular bainite and ferrite. When the nitrogen content increases from 0.016% to 0.029%, the strength and toughness of the tested steel increase, and the microstructure is refined. When the nitrogen content increases to 0.049%, the strength of the steel is basically unchanged, but the toughness drops sharply, the microstructure is obviously coarsened, and the grain boundary ferrite is formed. Vanadium in solid solution can promote the formation of lath bainite at grain boundary, and VN particles precipitated from austenite can promote the formation of acicular ferrite.

Key words: bainitic steel, microalloying, non-quenched and tempered steel, grain refinement strengthening, acicular ferrite

CLC Number:

TG142.1

Cai Mengru, Duan Meiqi, Hong Zhiwei, He Yizhu, Wang Ruizhen. Effect of nitrogen content on microstructure and properties of 25Mn2CrVS bainite type non-quenched and tempered steel[J]. Heat Treatment of Metals, 2020, 45(4): 34-39.

References

[1]陈忠伟, 张玉柱, 杨林浩. 低碳贝氏体钢的研究现状与发展前景[J]. 材料导报, 2006, 20(10): 84-86.
Chen Zhongwei, Zhang Yuzhu, Yang Linhao. Research and development of low carbon bainite steels[J]. Materials Review, 2006, 20(10): 84-86.
[2]巫宇峰, 惠卫军, 陈思联, 等. 钒对中碳非调质钢组织性能的影响[J]. 钢铁研究学报, 2016, 28(11): 56-62.
Wu Yufeng, Hui Weijun, Chen Silian, et al. Influence of vanadium on microstructure and mechanical properties of medium carbon forging steel[J]. Journal of Iron and Steel Research, 2016, 28(11): 56-62.
[3]李晓林, 蔡庆伍, 余伟, 等. 钒氮微合金化对ULCB钢组织性能和析出行为的影响[J]. 金属热处理, 2013, 38(1): 35-39.
Li Xiaolin, Cai Qingwu, Yu Wei, et al. Effect of V-N microalloying on precipitation behaviors, microstructure and properties of ultra-low carbon bainitic steel[J]. Heat Treatment of Metals, 2013, 38(1): 35-39.
[4]Pao Tao, Yang Caifu, Zhang Yongquan. Research of laboratorial simulation on the production of V-N microalloyed CSP steel[J]. Iron and Steel, 2006, 41(S): 143-148.
[5]马江南, 杨才福, 王瑞珍. 增氮对钒微合金钢组织和性能的影响[J]. 钢铁, 2015, 50(4): 63-69.
Ma Jiangnan, Yang Caifu, Wang Ruizhen. Influence of nitrogen addition on the microstructure and properties of vanadium microalloyed steel[J]. Iron and Steel, 2015, 50(4): 63-69.
[6]Han S Y, Shin S Y, Seo C H, et al. Effects of Mo, Cr, and V additions on tensile and Charpy impact properties of API X80 pipeline steels[J]. Metallurgical and Materials Transactions A, 2009, 40(8): 1851-1862.
[7]Glisic D, Radovic N, Koprivica A, et al. Influence of reheating temperature and vanadium content on transformation behavior and mechanical properties of medium carbon forging steels[J]. ISIJ International, 2010, 50(4): 601-606.
[8]Zener C. Grains, phases, and interfaces: An interpretation of microstructure[J]. Transaction of American Institute of Mining, Metallurgical, and Petroleum Engineers, 1948, 175: 15-51.
[9]龚维幂, 杨才福, 张永权. 钒氮钢中的晶粒细化研究[J]. 钢铁研究学报, 2006, 18(10): 49-53.
Gong Weimi, Yang Caifu, Zhang Yongquan. Grain refinement in V-N steel[J]. Journal of Iron and Steel Research, 2006, 18(10): 49-53.
[10]Adrian H. A mechanism for effect of vanadium on hardenability of medium carbon manganese steel[J]. Metal Science Journal, 1999, 15(4): 366-378.
[11]Shim J H, Oh Y J, Suh J Y, et al. Ferrite nucleation potency of non-metallic inclusions in medium carbon steels[J]. Acta Materialia, 2001, 49(12): 2115-2122.
[12]李凤照, 敖青, 姜江, 等. 高品质贝氏体钢的贝氏体铁素体和碳化物[J]. 金属热处理, 1998, 23(8): 3-5.
Li Fengzhao, Ao Qing, Jiang Jiang, et al. Bainitic ferrite and carbide of high quality bainitic steel[J]. Heat Treatment of Metals, 1998, 23(8): 3-5.
[13]Gutiérrez I. Effect of microstructure on the impact toughness of Nb-microalloyed steel: Generalisation of existing relations from ferrite-pearlite to high strength microstructures[J]. Materials Science and Engineering A, 2013, 571(4): 57-67.
[14]Shi Z R, Wang R Z, Su H, et al. Effect of nitrogen content on the second phase particles in V-Ti microalloyed shipbuilding steel during weld thermal cycling[J]. Materials and Design, 2016, 96(1): 241-250.

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