摘要
利用慢应变速率拉伸(SSRT)的方法研究了奥氏体不锈钢AL-6XN,316Ti和TP-347在550/650℃,25 MPa的超临界水环境中的应力腐蚀开裂敏感性。结果表明,随着温度由550℃升高到650℃,其屈服强度和抗拉强度均发生了明显的下降,而三者的延伸率却呈现出了3种不同的变化规律。由试样的断口和侧面形貌可知,AL-6XN在550/650℃,316Ti在550℃工况下具有应力腐蚀开裂倾向,且其应力腐蚀开裂倾向大小关系为:AL-6XN/550℃>316Ti/550℃>AL-6XN/650℃。
The susceptibility to stress corrosion cracking (SCC) of several austenitic stainless steels AL-6XN, 316Ti and TP-347 in supercritical water at 550 ℃/25 MPa and 650 ℃/25 MPa respec- tively was studied by slow strain rate tensile test (SSRT). The strain-stress curve shows that the strength of these three steels decreases as temperature increases; the change in the fracture elonga- tion of them shows different characteristics. The ex-situ scanning electron microscopy (SEM) ob- servation shows that AL-6XN at 550 ℃ and 650 ℃, and 316Ti at 550 ℃ exhibit a tendency of sus- ceptibility to SCC, and the tendency of susceptibility to SCC of the three steels may be ranked as: AL-6XN/550 ℃ 〉316Ti/550 ℃〉AL-6XN/650 ℃.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2014年第2期143-148,共6页
Corrosion Science and Protection Technology
基金
国家重点基础研究发展计划项目(2007CB209802)资助