奥氏体不锈钢高压空气管路失效原因分析  

Analysis of failure causes of austenitic stainless steel high pressure air pipeline

作　　者：赵存生 李竹影 董超芳 ZHAO Cun-sheng;LI Zhu-ying;DONG Chao-fang(College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan 430033, China;Inst. for Advanced Materials and Technology, Univ. of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]海军工程大学舰船与海洋学院,武汉430033 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《海军工程大学学报》2020年第5期1-5,共5页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51679245)。

摘　　要：为了预防奥氏体不锈钢管进一步失效并针对性提出处理措施,通过借助扫描电镜(SEM)对腐蚀产物及表面防腐涂层进行EDS能谱分析,结合内外表面无损检测、微观形貌分析、弯管受力分析等方法,针对高压蒸汽管失效行为进行了原因分析。实验结果表明:不锈钢管外表面存在明显的腐蚀产物覆盖,弯管内侧由于流固耦合效应受到最大应力;在含Cl的腐蚀性介质和残余应力共同作用下,不锈钢管发生应力腐蚀开裂,裂纹扩展方式为典型的穿晶扩展。In order to prevent further failure of the austenitic stainless steel tube and propose treatment measures in a targeted manner,the EDS spectrum analysis of corrosion products and surface anti-corrosion coatings was carried out by means of scanning electron microscopy(SEM).Combined with the non-destructive testing of internal and external surfaces,microscopic morphology analysis and bending force analysis,the causes of failure behavior of high pressure steam pipes were analyzed.The experimental results show that there is obvious corrosion product coverage on the outer surface of the stainless steel tube.The inner side of the elbow is subjected to the maximum stress due to the fluid-solid coupling effect.Under the action of corrosive medium containing Cl and residual stress,the stress corrosion cracking of the stainless steel tube occurs,and the crack propagation is typical transgranular expansion.

关 键 词：奥氏体不锈钢 高压空气管路 失效 

分 类 号：U661.44[交通运输工程—船舶及航道工程]