电焊机2024，Vol.54Issue(7)：125-131,7.DOI:10.7512/j.issn.1001-2303.2024.07.18
三偏心蝶阀失效分析及其司太立合金等离子熔覆修复研究
Failure Analysis of Three-eccentric Center Butterfly Valve and Its Plasma Cladding Repair with Stellite alloy
雷自成 1郭毅军 1关永康 1张书军 1李洁 2李世亮 2冯海波2
作者信息
- 1. 陕西陕煤韩城矿业有限公司,陕西 韩城 715407
- 2. 西安智能再制造研究院有限公司,陕西 西安 710018
- 折叠
摘要
Abstract
The failure analysis of the sealing face and shaft hole of the three-eccentric butterfly valve serviced in a coal mine gas extraction system was systematically investigated and the main failure mechanical was homogeneous corrosion.This failed three-eccentric butterfly valve is serviced in the high temperature gas rich in liquid and highly corrosive gas(H2S,CO2,SO2).Based on this,the sealing face and shaft hole is suggested to plasma cladding with stellite 12 alloy.Microstruc-ture observation,chemical composition and microhardness tests were performed to evaluate the cladding layer.The results show that the stellate cladding layer is consisted of cellular dendrites.The cladding layer is free from cracks and pores,show-ing good bonding with the base metal.The cellular structure is Co-based solid solution.The net structures rich in Cr element(Cr-based solid solution and chromium carbides)present continuous distribution among these cellular structures.Some W rich structures composed by W2C and Co-based solid solution are distributed in the net structure.The microhardness of the stellite cladding layer is 375～450 HV0.3,which is higher than the base metal(100～150 HV0.3)and the original stainless steel sleeve(200～250 HV0.3).The repaired butterfly valve has been in service for 4 months in the coal mine without failure,while the new butterfly valve failed after only 1 month of service.It is proved that the plasma cladding of stellite 12 alloy on the sealing face and shaft hole has well protected the substrate.关键词
等离子熔覆/失效分析/蝶阀/显微组织Key words
Plasma Cladding/failure analysis/butterfly valve/microstructure分类
矿业与冶金引用本文复制引用
雷自成,郭毅军,关永康,张书军,李洁,李世亮,冯海波..三偏心蝶阀失效分析及其司太立合金等离子熔覆修复研究[J].电焊机,2024,54(7):125-131,7.
