Alternative TitleFailure Analysis of Surface Stellite Alloy Overlayer on Disc of Wedge Gate Valve in a Nuclear Power Plant
张敏1; 明洪亮2; 王凡1; 张志明2; 王俭秋2; 韩恩厚2; 吕群贤1
Source Publication腐蚀科学与防护技术
Other AbstractThe surface Stellite alloy overlayer was found to be locally fallen off from the sealing faces of a wedge gate valve disc in a nuclear power plant.The surface welding overlayer was serviced in high-temperature and high-pressure primary water containing B and Li.The microstructure and chemical composition of the surface welding overlayer,the surface and cross-sectional morphologies of the local fallen area were assessed by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy(EDS).Results showed that cracks emerged on the Stellite overlayer,while the occurrence of falling off for the overlayer from the sealing faces was only limited in a small area.Obvious and big welding defects of shrinkage cavity during crystallization,and a small amount of welding holes and inclusions were found in the near surface layer of the Stellite overlayer.Improper welding procedure was believed to be the main reason for the formation of shrinkage cavity.These cavities were mainly distributed in the interdendrite,whilst continuous cavities with the characteristics of zonal distribution were nearly perpendicular to the overlayer surface.It is proposed that under the external pressing force of sealing faces,the internal welding shrinkage cavities may be apt to crack,therewith,initiate the cracking of surface overlayer.
Keyword失效分析 司太立合金 堆焊层 阀瓣
Indexed ByCSCD
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Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Recommended Citation
GB/T 7714
张敏,明洪亮,王凡,等. 某核电厂楔形闸板阀阀瓣表面司太立合金堆焊层失效分析[J]. 腐蚀科学与防护技术,2019,31.0(006):622-630.
APA 张敏.,明洪亮.,王凡.,张志明.,王俭秋.,...&吕群贤.(2019).某核电厂楔形闸板阀阀瓣表面司太立合金堆焊层失效分析.腐蚀科学与防护技术,31.0(006),622-630.
MLA 张敏,et al."某核电厂楔形闸板阀阀瓣表面司太立合金堆焊层失效分析".腐蚀科学与防护技术 31.0.006(2019):622-630.
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