电站锅炉堵阀表面裂纹分析及寿命评估预防措施

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关键词：堵阀；应力不均；流动性热裂纹；补焊

中图分类号：TK227 文献标志码：A 文章编号：1003-5168（2025）08-0088-04

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.08.016

Abstract： [Purposes] This paper aims to analyze the problem of surface crack defects that often occur in the casting of blocking valves for power plant boilers，and provide theoretical basis for preventive measures and life evaluation of blocking valve surface cracks.[Methods] Taking the high-temperature cast steel valve body of the reheating section of a power plant boiler as an example，non-destructive testing， metallgraphic testing，hardness testing，chemical composition analysis and other tests were conducted. At the same time，ANSYS software was used to simulate and analyze the characteristics of the surface crack location， morphology expansion direction， metalographic structure，etc.[Findings] The results indicate that the crack is a fluid thermal crack under uneven stress dynamics.[Conclusions] In order to prevent surface cracks in valve blockages，it is necessary to optimize casting processes，avoid stress concentration，and strictly control welding heat treatment processes.

Keywords： valve blockage; uneven stress; fluidity hot crack; repair welding

0 引言

电站锅炉主要承压部件的失效方式包括疲劳、腐蚀、氧化、蠕变和断裂等[1]。（剩余3977字）