理化检验-物理分册2025，Vol.61Issue(7)：39-42,4.DOI:10.11973/lhjy-wl240114
S30409不锈钢翼阀断裂原因
Fracture reason of S30409 stainless steel wing valve
张丛敏1
作者信息
- 1. 湖北特种设备检验检测研究院宜昌分院,宜昌 443000
- 折叠
摘要
Abstract
The fracture accident of S30409 stainless steel wing valve of cyclone separator in a catalytic cracking unit occurred during service.The fracture reason of wing valve was analyzed by means of chemical composition analysis,metallographic examination,mechanical property test,fracture analysis and energy spectrum analysis.The results show that the wing valve was in service at high temperature for a long time,and a large amount of σ phase was precipitated in the microstructure,which led to the embrittlement of the material and the decrease of plasticity and toughness.The discontinuous shape and size of the weld caused a large stress concentration.Under the action of the gas-solid two-phase flow pressure and the thermal stress generated by the heating and cooling of the device,micro-cracks were initiated and the cracks continued to expand,eventually leading to the fracture of the wing valve.关键词
S30409不锈钢/σ相/脆化/焊缝/断裂/应力集中Key words
S30409 stainless steel/σ phase/embrittlement/welding seam/fracture/stress concentration分类
通用工业技术引用本文复制引用
张丛敏..S30409不锈钢翼阀断裂原因[J].理化检验-物理分册,2025,61(7):39-42,4.
