Hydrogen-related Crack Propagation in an Ultrafine-grained High-Mn TWIP Steel
Twinning-Induced Plasticity (TWIP) steels exhibit both high strength and large ductility.In addition,it has been reported that grain refinement improves mechanical properties of TWIP steels significantly.On the other hand,hydrogen embrittlement can be a serious issue for the practical use of TWIP steels.The present study investigated the hydrogen-related crack propagation in a 22Mn-0.6C TWIP steel with coarse and ultrafine grain sizes.Hydrogen pre-charged double-notched tensile test specimens were prepared and tensile test was stopped immediately after reaching the maximum stress to observe the propagation of hydrogen-related cracks formed at the specimen surface.A large number of cracks were observed in thehydrogen-charged specimens regardless of the grain size.All the cracks were nearly perpendicular to the tensile axis.However,the size of the hydrogen-related cracks decreased in the ultrafine-grained specimen.EBSD orientation analysis revealed that most of the hydrogen-related cracks propagated along grain boundaries in both coarse-grained and ultrafine-grained specimens.
TWIP steel hydrogen embrittlement grain refinement crack length microstructure
BAI Yu MOMOTANI Yuji SHIBATA Akinobu TSUJI Nobuhiro
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan;Elements St
国际会议
成都
英文
155-158
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）