Investigation of Susceptibility to Intergranular Corrosion of Tin-Added Austenitic Stainless Steel  

作　　者：Min Sun Yuan-Yuan Yang Ming Luo Lai-Zhu Jiang Yi-Ming Jiang Jin Li 

机构地区：[1]Department of Materials Science, Fudan University [2]Research and Development Center, Baosteel Co., Ltd.

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第9期1183-1189,共7页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51501041, 51131008 and 51371053);China Postdoctoral Science Foundation (No. 2013M541463);National Key Technology R&D Program (No. 2012BAE04B00);Doctoral Fund of Ministry of Education of China (No. 20120071110013)

摘　　要：The intergranular corrosion （IGC） character of tin-added B316LX and the influence of tin addition on IGC susceptibility were investigated by DL-EPR, oxalic acid etch test and transmission electron microscopy. IGC susceptibility of B316LX is mainly caused by the precipitation of M23C6 carbide and intermetallic Laves phase. DL-EPR test is unsuitable to evaluate the IGC susceptibility of B316LX with long-time sensitization, because more carbides and inter- metallic phases are formed at grain boundaries and inside the grains, which induce more severe IGC and pits attacks. Tin addition increases the IGC susceptibility, maybe due to diffusion of tin toward grain boundaries.The intergranular corrosion （IGC） character of tin-added B316LX and the influence of tin addition on IGC susceptibility were investigated by DL-EPR, oxalic acid etch test and transmission electron microscopy. IGC susceptibility of B316LX is mainly caused by the precipitation of M23C6 carbide and intermetallic Laves phase. DL-EPR test is unsuitable to evaluate the IGC susceptibility of B316LX with long-time sensitization, because more carbides and inter- metallic phases are formed at grain boundaries and inside the grains, which induce more severe IGC and pits attacks. Tin addition increases the IGC susceptibility, maybe due to diffusion of tin toward grain boundaries.

关 键 词：Stainless steel TIN SEM TEM Intergranular corrosion 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG174.442[金属学及工艺—金属材料]