Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel after long-term aging at high temperature

doi:10.13251/j.issn.0254-6051.2023.09.033

Abstract

Abstract: Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel aged at 530 ℃ for 10 000 h at most were studied. The results show that during the aging process, the MC phases are mainly precipitated and distributed in the bainite laths and at the lath boundaries, and the precipitated amount of MC phases increases but the size does not show significant coarsening. With the increase of aging time, the bainite lath boundaries become blurred gradually and the lath width of bainite increases. After aging for up to 10 000 h at 530 ℃, the strength of the 20Cr1Mo1VTiB bolt steel has no significant change at room temperature and high temperature, the impact property at low temperature increases, and the microstructure recovery effect is obvious, indicating that the steel has good microstructure stability at 530 ℃.

Key words: 20Cr1Mo1VTiB bolt steel, aging, microstructure, mechanical properties

CLC Number:

TG142.1

Li Xin, Wu Zhiguang, Zhao Jiqing, Yang Gang. Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel after long-term aging at high temperature[J]. Heat Treatment of Metals, 2023, 48(9): 197-202.

References

[1]张传平. 20Cr1Mo1VTiB钢粗晶组织对高温紧固件安全性的分析[J]. 机械工程材料, 1984(1): 58-60.
[2]王志武, 宋涛. 高温服役3×10⁵ h后汽缸螺栓用20Cr1Mo1V1钢的应力松弛性能[J]. 机械工程材料, 2013, 37(2): 74-77.
Wang Zhiwu, Song Tao. Stress relaxation of 20Cr1Mo1V1 steel for cylinder bolt after working for 3×10⁵ h at high temperature[J]. Materials for Mechanical Engineering, 2013, 37(2): 74-77.
[3]王飞, 夏尊美, 王红樱. 20Cr1Mo1VTiB汽轮机螺栓断裂失效分析[J]. 湖南电力, 2009, 29(5): 54-55, 58.
[4]武志广, 龚雪婷, 李鑫, 等. 热处理工艺对20Cr1Mo1VTiB螺栓钢持久性能的影响[J]. 钢铁, 2020, 55(6): 101-106.
Wu Zhiguang, Gong Xueting, Li Xin, et al. Effect of heat treatment process on creep-rupture property of 20Cr1Mo1VTiB bolt steel[J]. Iron & Steel, 2020, 55(6): 101-106.
[5]龚雪婷, 武志广, 李鑫, 等. 热处理工艺对20Cr1Mo1VTiB螺栓钢组织及性能的影响[J]. 钢铁, 2018, 53(12): 105-111.
Gong Xueting, Wu Zhiguang, Li Xin. et al. Effect of heat treatment process on microstructure and mechanical properties of 20Cr1Mo1VTiB steel[J]. Iron & Steel, 2018, 53(12): 105-111.
[6]冯家伟, 牛梦超, 王威, 等. 超高强度马氏体时效钢的力学行为与微观组织演化的关系[J]. 材料研究学报, 2019, 33(9): 641-649.
Feng Jiawei, Niu Mengchao, Wang Wei, et al. Relationship between mechanical behavior and microstructure for an ultra-high strength maraging steel[J]. Chinese Journal of Materials Research, 2019, 33(9): 641-649.
[7]刘正东, 程世长, 包汉生, 等. 钒对T122铁素体耐热钢组织和性能的影响[J]. 特殊钢, 2006, 27(1): 7-10.
Liu Zhengdong, Cheng Shichang, Bao Hansheng, et al. Effect of vanadium on structure and properties of ferrite heat resistant steel T122[J]. Special Steel, 2006, 27(1): 7-10.
[8]赵孟雅, 彭涛, 赵吉庆, 等. 长期时效对20Cr1Mo1VTiB螺栓钢的组织和力学性能的影响[J]. 材料研究学报, 2020, 34(5): 321-327.
Zhao Mengya, Peng Tao, Zhao Jiqing, et al. Effect of long-term aging on microstructure and mechanical properties of 20Cr1Mo1VTiB bolt steel[J]. Chinese Journal of Materials Research, 2020, 34(5): 321-327.
[9]Wei F G, Tsuzaki K. Quantitative analysis on hydrogen trapping of TiC particles in steel[J]. Metallurgical and Materials Transactions A, 2006, 37(2): 331-353.
[10]Zhang M, Li M, Chi J, et al. Microstructure evolution, recrystallization and tribological behavior of TiC/WC composite ceramics coating[J]. Vacuum, 2019, 166: 64-71.
[11]Zhu M L, Wang D Q, Xuan F Z. Effect of long-term aging on microstructure and local behavior in the heat-affected zone of a Ni-Cr-Mo-V steel welded joint[J]. Materials Characterization, 2014, 87: 45-61.
[12]Xiong H H, Zhang H H, Zhang H N, et al. Effects of alloying elements X (X=Zr, V, Cr, Mn, Mo, W, Nb, Y) on ferrite/TiC heterogeneous nucleation interface: First-principles study[J]. Journal of Iron and Steel Research International, 2017, 24(3): 328-334.
[13]Jang J H, Lee C H, Heo Y U, et al. Stability of (Ti, M)C (M=Nb, V, Mo and W) carbide in steels using first-principles calculations[J]. Acta Materialia, 2012, 60(1): 208-217.
[14]Jang J H, Lee C H, Han H N, et al. Modelling coarsening behavior of TiC precipitates in high strength, low alloy steels[J]. Materials Science and Technology, 2013, 29(9): 1074-1079.
[15]雍岐龙. 钢铁材料中的第二相[M]. 北京: 冶金工业出版, 2006.