Failure analysis of high temperature fastening bolt of 20Cr1Mo1VNbTiB steel

doi:10.13251/j.issn.0254-6051.2023.08.047

Abstract

Abstract: A high-temperature bolt made of 20Cr1Mo1VNbTiB steel for a certain supercritical unit was early fractured. The macroscopic and microscopic characteristics of the fracture were observed, the aging condition of the bolt was analyzed, and the failure reasons were discussed. The results show that after running at high temperature, the aggregate growth of carbides in the bolt is not obvious, the decrease of tensile strength and hardness is not significant, but the decrease of impact absorbed energy is obvious, which means that the bolt fracture failure is not related to the aging. Excessive preload during the bolt assembly accelerates its creep damage. According to the fracture morphology, it is determined that the fracture belongs to high temperature creep rupture.

Key words: 20Cr1Mo1VNbTiB steel, bolt, fracture, microstructure, mechanical properties

CLC Number:

TG162.84

Huang Jiang, Mou Shenzhou, Wang Jing, Tao Liang, Huang Qiaosheng, Wang Xue. Failure analysis of high temperature fastening bolt of 20Cr1Mo1VNbTiB steel[J]. Heat Treatment of Metals, 2023, 48(8): 286-290.

References

[1]姜求志. 火力发电厂金属材料手册[M]. 北京: 中国电力出版社, 2001: 864-869.
[2]张广兴, 李中伟, 张东文, 等. 火力发电厂高温紧固件在金属监督中存在的问题分析[J]. 汽轮机技术, 2011, 53(4): 318-320, 244.
Zhang Guangxing, Li Zhongwei, Zhang Dongwen, et al. The analysis and solutions in metal supervision about high temperature bolt[J]. Turbine Technology, 2011, 53(4): 318-320, 244.
[3]马菊仙, 毛树楷, 朱敦伦. 25Cr2Mo1V钢高温紧固螺栓脆化及恢复热处理[J]. 金属热处理, 1992, 17(10): 3-7, 17.
Ma Juxian, Mao Shukai, Zhu Dunlun. The embrittlement and restoring heat treatment of high temperature fastening bolts made of 25Cr2Mo1V steel[J]. Heat Treatment of Metals, 1992, 17(10): 3-7, 17.
[4]李明超, 张号, 曾强, 等. 长期服役后12%Cr高温螺栓断裂失效分析[J]. 热加工工艺, 2022, 51(20): 162-166.
Li Mingchao, Zhang Hao, Zeng Qiang, et al. Analysis on fracture failure of 12%Cr high temperature bolt during long-time service[J]. Hot Working Technology, 2022, 51(20): 162-166.
[5]张道钢, 李金峰. 20Cr1Mo1VNbTiB钢高温螺栓运行脆化及恢复热处理[J]. 中国电力, 1995(12): 42-45.
[6]张树理. 20Cr1Mo1VNbTiB高温螺栓钢热处理工艺的优化设计[J]. 华北电力技术, 1992(5): 31-36.
[7]蔡文和. 争气1号钢高温螺栓运行后组织和力学性能变化的研究[J]. 华北电力技术, 1997(8): 11-14.
[8]梁昌乾, 陈吉钢, 李砥流, 等. 高温紧固螺栓的剩余寿命评估[J]. 热力发电, 2004, 33(3): 61-63.
Liang Changqian, Chen Jigang, Li Diliu, et al. Evaluation of residual service life for high-temperature fastening bolts[J]. Thermal Power Generation, 2004, 33(3): 61-63.
[9]王佩宁, 赵海. 高温螺栓断裂分析及监督检验方法探讨[C]//第12届全国电站焊接学术论文讨论会. 中国电机工程学会, 2013: 1-6.
[10]江国栋, 洪茂林. 气缸M120高温螺栓失效机理的研究[J]. 热加工工艺, 2005(12): 69-70.
Jiang Guodong, Hong Maolin. Study on failure mechanism of cylinder M120 high-temperature bolt[J]. Hot Working Technology, 2005(12): 69-70.

[1]	Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effect of Ni content on microstructure and mechanical properties of 40CrNi3MoV steel strengthened by NiAl-Cu [J]. Heat Treatment of Metals, 2023, 48(8): 1-7.
[2]	Niu Xu, Liu Yue, Wang Zhuo, Zhang Yajing, Liu Pingxiang. Effect of vanadium content on microstructure and properties of Cr20 high chromium cast iron for straw puffing machine screw [J]. Heat Treatment of Metals, 2023, 48(8): 8-15.
[3]	Wu Yang, Qian Yafeng, Zhao Yanhui. Effects of Al content and aging time on mechanical properties and damping capacity of Mg-Al magnesium alloys [J]. Heat Treatment of Metals, 2023, 48(8): 30-34.
[4]	Sun Xiaoran, Wang Chengming, Zhao Nan, Bai Lijuan, Zheng Wenyue. Analysis of continuous cooling transformation characteristics of 4330-Nb steel for sucker rod [J]. Heat Treatment of Metals, 2023, 48(8): 42-46.
[5]	Guo Yafei, Li Zhilong, Zhang Bo, Li Jie, Pang Qinghai. Phase transformation behavior during continuous cooling of Cr8 back-up roll steel [J]. Heat Treatment of Metals, 2023, 48(8): 47-51.
[6]	Qi Yi, Yang Jianquan, Jiao Fei. Microstructure and properties of alloy steel connecting rod quenched in different quenching media [J]. Heat Treatment of Metals, 2023, 48(8): 64-71.
[7]	Sun Tingting, Chen Weili, Jia Zilong. Effect of isothermal temperature on microstructure and hardness of ultra-low carbon bainitic steel [J]. Heat Treatment of Metals, 2023, 48(8): 94-98.
[8]	Shi Feng, Yao Weimin, Shen Jian, Yin Chunhong, Cao Qi, Hong Yaguang, Xu Hui, Ding Yang. Effect of solution treatment on microstructure and mechanical properties of turbine blade after long-term service [J]. Heat Treatment of Metals, 2023, 48(8): 99-105.
[9]	Peng Longsheng, Liu Chunquan, Xiong Fen, Zhang Ying, Huang Wei, Lin Yinghua. Effects of rolling method and heat treatment process on microstructure and properties of medium-Mn steel [J]. Heat Treatment of Metals, 2023, 48(8): 106-112.
[10]	Yang Yi, Liu Rangxian, Yang Haokun, Long Jun, Han Peixian, Zheng Zhibin. Effect of solution temperature on microstructure and properties of lightweight high manganese steel [J]. Heat Treatment of Metals, 2023, 48(8): 113-117.
[11]	Lü Da, Han Yanguang, Cui Yi, Zhao Yingli, Chen Wen, Zhang Zefeng, Ji Shuang. Hot working process of GH4169 superalloy [J]. Heat Treatment of Metals, 2023, 48(8): 132-137.
[12]	Wang Zhe, Wang Fei, Cao Heng, Wang Shujun, Hao Xiaobo, Zhang Qiang. Effect of hot working process on microstructure and properties of TC6 titanium alloy bars [J]. Heat Treatment of Metals, 2023, 48(8): 144-148.
[13]	Kang Cong, Jiao Zhen, Mu Botao, Ren Chiqiang, Gao Wenchao, Li Wei, Yun Pengfei, Ouyang Wenbo. Effect of annealing treatment on microstructure and mechanical properties of Ti6321 alloy [J]. Heat Treatment of Metals, 2023, 48(8): 149-153.
[14]	Zhu Lei, Wei Yibin. Effect of annealing temperature on microstructure and mechanical properties of silver layer in silver/steel composite plate fabricated by explosive welding [J]. Heat Treatment of Metals, 2023, 48(8): 154-160.
[15]	Chen Wentao, Yin Jing, Wang Chunyan, Hu Guiling. Heat treatment and strengthening mechanisms of laser additive manufactured 6061 aluminum alloy [J]. Heat Treatment of Metals, 2023, 48(8): 172-178.