流体机械2017，Vol.45Issue(1)：1-7,7.DOI:10.3969/j.issn.1005-0329.2017.01.001
湿H2S及Cl-环境下FV520B不锈钢的应力腐蚀行为研究
Stress Corrosion Cracking Behavior of FV520B Stainless Steel Exposed to Aqueous H2S+Cl-Environment
摘要
Abstract
Stress corrosion cracking (SCC) susceptibility of FV520B martensitic precipitated hardening stainless steel exposed to aqueous hydrogen sulfide solution,sodium chloride solution and aqueous hydrogen sulfide containing with 5% sodium chloride solution were investigated by slow strain rate tensile test.The influence of hydrogen sulfide concentration was also taken into account.FV520B stainless steel in aqueous hydrogen sulfide containing with 5% sodium chloride solution revealed a higher susceptibility to SCC than that exposed to other two mediums;the susceptibility increases with increasing of the concentration of hydrogen sulfide.Scanning electron microscopy analyses showed that the fracture of SSRT was transited from cavity fracture to brittle fracture when the concentration of H2S increased.The constant displacement stress corrosion tests of FV520B steel exposed to aqueous hydrogen sulfide with chloride displayed that the fracture toughness of FV520B significantly decreased due to the influence of corrosive medium and threshold stress intensity factor (KISCC) of FV520B decreases with the concentration of hydrogen sulfide increasing.Fracture morphology analyses showed that the fracture was characterized by quasi-cleavage and the SCC mechanism of FV520B stainless steel exposed to aqueous hydrogen sulfide with chloride is hydrogen embrittlement (HE) type of SCC.关键词
FV520B马氏体沉淀硬化不锈钢/应力腐蚀开裂/H2S腐蚀Key words
FV520B Martensitic precipitated hardening stainless steel/stress corrosion cracking/hydrogen sulfide分类
机械制造引用本文复制引用
魏仁超,陈学东,范志超,聂德福,吴乔国,金有海..湿H2S及Cl-环境下FV520B不锈钢的应力腐蚀行为研究[J].流体机械,2017,45(1):1-7,7.基金项目
国家重点基础研究发展计划(973计划)项目(2012CB026003) （973计划）
