给水泵汽轮机调节汽阀阀杆断裂原因分析

doi:10.16039/j.cnki.cn22-1249.2018.05.014

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摘要通过宏观检查，断口分析，成分分析，硬度检测和金相分析，对2Cr12MoV给水泵汽轮机调节汽阀阀杆断裂失效原因进行了分析。结果表明，失效阀杆的化学成分符合GB/T 8732-2014标准的规定，断裂阀杆的金相组织正常，为马氏体。阀杆硬度值符合GB/T 8732-2014标准的规定。断裂失效原因是由于调节汽阀阀杆退刀槽位置存在加工刀痕，表面粗糙度大，在机组运行过程中，阀杆在长期循环拉应力作用下，在应力集中最大的根部倒角位置产生疲劳裂纹，裂纹不断扩展，最终发生断裂。

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	于宏辰

关键词: 调节汽阀阀杆 2Cr12MoV 断裂

Abstract: The reason for fracture of steam turbine regulating valve stem is analyzed by macroscopic examination, fracture analysis, component examination, hardness testing and metallographic observation. The results show that chemical composition of the invalid stem is in accordance with the requirements of the GB/T 8732-2014 standard. The microstructure of the invalid stem is martensite. The hardness value of the stem is in accordance with the GB/T 8732-2014 standard. Machining marks exist in the retreating slot position of the stem and the larger surface roughness is the reasons for fracture. The valve stem bears the cyclic tensile stress for a long time during the operation of the unit, of which fatigue cracks produced in the root chamfering position with greater stress concentration, leading to the fracture of valve stem.

Key words: regulating valve stem 2Cr12MoV fracture

出版日期: 2018-05-25 发布日期: 2018-05-25 整期出版日期: 2018-05-25

TH 123

引用本文:

于宏辰. 给水泵汽轮机调节汽阀阀杆断裂原因分析[J]. 吉林化工学院学报, 2018, 35(5): 54-57.
YU Hong-chen. Analysis of the Regulating Valve Stem Fracture in Steam Turbine Feed Pump. Journal of Jilin Institute of Chemical Technology, 2018, 35(5): 54-57.

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https://xuebao.jlict.edu.cn/CN/10.16039/j.cnki.cn22-1249.2018.05.014 或 https://xuebao.jlict.edu.cn/CN/Y2018/V35/I5/54

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