理化检验-物理分册2016，Vol.52Issue(10)：755-757,758,4.DOI:10.11973/lhjy-wl201610018
给水三通阀阀杆断裂失效分析
Failure Analysis on Fracture of a Water Supply Three-way Valve Stem
郑文祥 1吴跃 1刘俊建1
作者信息
- 1. 中国大唐集团科学技术研究院有限公司 华东分公司，合肥 230031
- 折叠
摘要
Abstract
Macro examination, chemical composition analysis, tensile test, impact test, metallographic examination and hardness test were performed on a fractured water supply three-way valve stem to find out its fracture failure reasons.The results show that the fracture of the valve stem was fatigue fracture.The main reason for the fracture was that the nitriding process increased the brittlement of the changeable cross-section position of stem and stem core,and the structure change of stem and stem core caused stress concentration,thus forming a crack source when the stem was extruded and sheared with fluid.Under the action of alternating stress during service of the valve stem,the formed crack gradually extended from the nitriding layer to the valve stem base material,which led to the eventual fracture of the valve stem.关键词
阀杆/渗氮/脆性/应力集中/疲劳断裂Key words
valve stem/nitriding/brittlement/stress concentration/fatigue fracture分类
能源科技引用本文复制引用
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):755-757,758,4.
