5th International High Manganese Steel Conference - HMNS 2022

N alloyed austenitic stainless steels are known as good candidates for replacing commercial austenitic stainless steels (STS) like AISI 304 and 316, etc due to their high strength, excellent pitting resistance with low Ni content. Austenitic steels containing (10-20)Cr, (10-20)Mn and (C+N)>0.3% manufactured by conventional vacuum induction melting have been studied intensively for the last 2-3 decades. In addition, as the importance of hydrogen economy is growing, understanding the role of N in STS in hydrogen environment is also drawing a great attention. Due to the low yield strength of commercial grade austenitic STS, researches for the development of high strength STS has been done worldwide.
In the first part of this presentation, the recent progress in the research on new alloy design, mechanical properties, deformation mechanism, and corrosion resistance in the (C+N) alloyed austenitic stainless steels will be reviewed. Some the combined addition of C and N helps easy manufacturing, the importance of C/N ratio on mechanical properties and corrosion resistance has been actively studied recently. In the second part, the effects of N on hydrogen embrittlement behavior will be presented. Among them the effects of N on hydrogen diffusivity, crack initiation and propagation, and change of strain hardening rate are included.