Interplay of Microbiological Corrosion and Alloy Microstructure in Failures of Advanced Stainless Steels and their Weldments in Marine Environments

拟议的研究计划调查微生物诱导腐蚀(MIC)在先进不锈钢(SS)焊接件的应力腐蚀破裂(SCC)中的作用。随着先进的抗SCC不锈钢无法减少失效，SS焊件的大面积过早SCC故障最近在澳大利亚海洋工业中变得越来越严重。SCC数据的不一致要求更好地理解MIC在SCC中的作用，特别是因为最近的失效分析表明，微生物活动对不锈钢及其焊接件的局部腐蚀(即点蚀)具有深刻的作用，而且众所周知，点蚀有助于SCC的启动。

The proposed research program investigates the role of microbiologically-induced corrosion (MIC) on stress corrosion cracking (SCC) of weldments of advanced stainless steels (SS). Extensive premature SCC failures of SS weldments have lately become increasingly significant in Australian marine industry, following the inability of advanced SCC-resistant SS to alleviate failures. Inconsistencies in SCC data call for an improved understanding of the role of MIC on SCC, particularly because recent failure analyses have indicated a profound role of microbiological activity on localised corrosion (viz., pitting) of stainless steels and their weldments, as well as because pitting is known to facilitate SCC initiation.