Effects of nitrogen on microstructure of cold deformed high nitrogen austenitic stainless steelsChinese Full Text
WANG Wei1,CHEN Shu-mei2,YAN Wei1,ZHAO Li-jun1,SHAN Yi-yin1,YANG Ke1(1.Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;2.Locomotive and Car Research Institute,Chinese Academy of Railway Sciences,Beijing 100080,China)
Abstract: Microstructure of two cold deformed high nitrogen austenitic stainless steels（HNSs）,with 0.66% N and 1.20% N,respectively,was investigated by TEM.The results show that the stacking fault energy（SFE） of the steel increases with increase of nitrogen,which obviously promotes the planar slipping of dislocations in the steel.Mechanical twins are formed with cold deformation of the steel,which are decreases to only hundreds nanometer in dimension as the deformation increases to 60%.The effect of nitrogen in the steel is analyzed in terms of the extended dislocation theory and the short range ordering（SRO）.SRO caused by nitrogen is considered to be the most important factor that promotes planar slipping and increases the work-hardening ability for HNSs.The low SFE,which could cause the extension of dislocations,should also play an important role on the increase of work-hardening ability for HNSs.
Keywords：
high nitrogen steel; cold deformation; microstructure; stacking fault energy; short range ordering;
- DOI：
10.13289/j.issn.1009-6264.2010.07.029
- Series：
- Subject：
- Classification Code：
TG142.13
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