超超临界机组汽轮机X39CrMo17-1不锈钢阀杆断裂失效分析
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摘要
利用化学分析、力学性能测试、光学显微镜和SEM等手段,从成分分析、拉伸性能、冲击性能、组织结构、裂纹形态和断口形貌等方面对失效的某超超临界机组汽泵出口电动阀阀杆进行解剖分析,结合电动阀的安装、使用、运行等方面研究了其断裂的影响因素。结果表明,X39CrMo17-1不锈钢阀杆心部存在大量铁素体,组织状态不佳;冲击性能低于标准下限值;应力较为集中,在拉伸和扭转应力共同作用下,阀杆在最薄弱的退刀槽部位应力过载发生脆性断裂。
By means of chemical analysis,mechanical property test,optical microscope and SEM,a failed ultra-supercritical steam electric pump outlet valve stem was dissected from the aspects of composition analysis,tensile performance,impact performance,microstructure,crack morphology and fracture morphology. Then the factors influencing fracture was studied combined with electric valve installation,use,operation and other aspects. The results show that a large number of ferrite exists in the core of X39CrMo17-1 stainless steel valve stem and with poor microstructure. The impact performance is lower than the standard lower limit. The stress is relatively concentrated,and under the combined action of tensile stress and torsion stress,the brittle fracture is caused by the valve stem overload in the weakest slot position.
By means of chemical analysis,mechanical property test,optical microscope and SEM,a failed ultra-supercritical steam electric pump outlet valve stem was dissected from the aspects of composition analysis,tensile performance,impact performance,microstructure,crack morphology and fracture morphology. Then the factors influencing fracture was studied combined with electric valve installation,use,operation and other aspects. The results show that a large number of ferrite exists in the core of X39CrMo17-1 stainless steel valve stem and with poor microstructure. The impact performance is lower than the standard lower limit. The stress is relatively concentrated,and under the combined action of tensile stress and torsion stress,the brittle fracture is caused by the valve stem overload in the weakest slot position.
引文
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[9]梁顺可.基于ANSYS的阶梯轴应力集中研究[J].机械制造,2017,55(638):67-69.Liang Shunke.Stress concentration study of stepped shaft based on ANSYS[J].Machinery Manufacturing,2017,55(638):67-69.
[10]Zhang Xin,Chen Ansheng,Wang Xiaoru,et al.Failure analysis of dissimilar steel welding cracking on high and medium pressure guide pipe[J].Materials Science Forum,2017,898:1103-1109.
[2]王永梅.X39CrMo17-1轴断裂失效分析[J].资源信息与工程,2015,30(5):84-85.Wang Yongmei.Fracture failure analysis of X39CrMo17-1 axis[J].Resource Information and Engineering,2015,30(5):84-85.
[3]赵亮,马党参,刘建华,等.淬回火工艺对马氏体不锈钢3Cr17Mo组织和力学性能的影响[J].特殊钢,2006,27(2):58-60.Zhao Liang,Ma Dangshen,Liu Jianhua,et al.Effect of quenching and tempering process on microstructure and mechanical properties of martensitic stainless steel 3Cr17Mo[J].Special Steel,2006,27(2):58-60.
[4]郑文祥,吴跃,刘俊建.给水三通阀阀杆断裂失效分析[J].理化检验-物理分册,2016,52(10):755-758.Zheng Wenxiang,Wu Yue,Liu Junjian.Failure analysis of stem fracture of three-way water supply valve[J].Physical and Chemical Inspection-Physical Subvolume,2016,52(10):755-758.
[5]杨添,官益豪,唐耀波,等.流量调节阀阀杆断裂失效分析[J].江苏科技大学学报(自然科学版),2016,30(1):28-32.Yang Tian,Guan Yihao,Tang Yaobo,et al.Failure analysis of flow control valve stem fracture[J].Journal of Jiangsu University of Science and Technology(Natural Science Edition),2016,30(1):28-32.
[6]王志武,费勤楠,梅伟,等.300 MW汽轮机高压主汽阀阀杆断裂原因分析[J].金属热处理,2011,36(8):21-24.Wang Zhiwu,Fei Qinnan,Mei Wei,et al.Cause analysis of stem fracture of high pressure main steam valve of 300 MW steam turbine[J].Heat Treatment of Metals,2011,36(8):21-24.
[7]李彦林,朱敏,聂常贵.热电厂汽轮发电机组高压阀杆断裂失效分析[C]//第三届十省区市机械工程学会科技论坛暨黑龙江省机械工程学会2007年年会论文(摘要)集.2007:7.
[8]黄维浩,任晓,何龙.热处理工艺对马氏体不锈钢X39CrMo17-1组织和性能影响的研究[J].动力工程学报,2016,36(7):584-588.Huang Weihao,Ren Xiao,He Long.Study on the effect of heat treatment process on the structure and properties of martensitic stainless steel X39CrMo17-1[J].Journal of Power Engineering,2016,36(7):584-588.
[9]梁顺可.基于ANSYS的阶梯轴应力集中研究[J].机械制造,2017,55(638):67-69.Liang Shunke.Stress concentration study of stepped shaft based on ANSYS[J].Machinery Manufacturing,2017,55(638):67-69.
[10]Zhang Xin,Chen Ansheng,Wang Xiaoru,et al.Failure analysis of dissimilar steel welding cracking on high and medium pressure guide pipe[J].Materials Science Forum,2017,898:1103-1109.