Abstract
High-nitrogen Fe-18Mn-18Cr-N austenitic steels with higher yield strength have been recently developedand used for generator retaining rings because they have non-magnetic, high strength, high ductility, andgood corrosion resistance. In the present study, a high-nitrogen Fe-18Mn-18Cr-0.61N austenitic steel was fabricatedand then tensile and Charpy impact tests were conducted on them in order to investigate the effect of coldworking on the mechanical properties. Although the yield and tensile strengths usually increased with cold working,the ductility and impact toughness significantly decreased after cold working. On the other hand, the highnitrogenaustenitic steel exhibited a ductile-brittle transition due to unusual brittle fracture at low temperaturesdespite having a face-centered cubic structure. The ductile-brittle transition temperature obtained from Charpyimpact tests could be remarkably increased by 60oC after 20% cold working because of the enhanced cleavagelikebrittle fracture.
| Translated title of the contribution | Effect of Cold Working on Tensile and Charpy Impact Properties of a High-Nitrogen Fe-18Mn-18Cr-0.61N Austenitic Steel |
|---|---|
| Original language | Korean |
| Pages (from-to) | 121-126 |
| Number of pages | 6 |
| Journal | 열처리공학회지 |
| Volume | 27 |
| Issue number | 3 |
| DOIs | |
| State | Published - 2014 |