不锈钢堵头裂纹失效分析  

Failure analysis on crack of stainless steel plug

作　　者：朱姣[1] 钟振前[1] 杨春[1] 司红[1] 王冬梅[1] 

机构地区：[1]中国钢研科技集团有限公司国家钢铁材料测试中心,北京100081

出　　处：《金属热处理》2016年第3期189-192,共4页Heat Treatment of Metals

基　　金：中国应急分析测试平台(2060503)

摘　　要：不锈钢堵头经使用5年后出现严重的穿透性裂纹,通过裂纹面断口分析、裂纹剖面金相检验、显微组织观察、显微硬度测试等方法对堵头裂纹形成原因进行了分析。结果表明,堵头裂纹属于应力腐蚀裂纹,堵头外表面介质环境存在较多含硫酸根等应力腐蚀敏感的离子是导致不锈钢堵头发生应力腐蚀开裂的主要原因。A stainless steel plug cracked seriously after five-year service. The crack causes of the plug were investigated by means of fracture analysis of the crack surface,metallographic examination of the crack profile,microstructure observation and microhardness test. The results show that the crack of the plug is stress corrosion cracking. In the outer surface of the plug,there are a lot of stress-corrosion-sensitive ions such as sulfate,which is the main reason for the stress corrosion cracking of the stainless plug.

关 键 词：不锈钢堵头 裂纹 应力腐蚀 失效 

分 类 号：TG142[一般工业技术—材料科学与工程]