| Title |
Effect of Reverse Transformation on the Mechanical Properties of High Manganease Austenitic Stainless Steel |
| Authors |
강창룡(C. Y. Kang); 허태영(T. Y. Hur) |
| DOI |
https://doi.org/10.3365/KJMM.2012.50.6.413 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
high manganese austenite stainless steel; reverse transformation; reversed austenite; stability of austenite; deformation induced martensite |
| Abstract |
This study was carried out to investigate the effect of reverse transformation on the mechanical properties in high manganese austenitic stainless steel. Over 95% of the austenite was transformed to deformation-induced martensite by 70% cold rolling. Reverse transformation became rapid above an annealing temperature of 550℃, but there was no significant transformation above 700℃. In addition, with an increasing annealing time at 700℃, reverse transformation was induced rapidly, but the transformation was almost completed at 10 min. There was a rapid decrese in strength and hardness with annealing at temperature above 550℃, while elongation increased rapidly above 600℃. At 700℃, hardness and strength decreased rapidly, and elongation increased steeply with an increasing reverse treatment time up to 10 min, whereas there were no significant change with a treatment time after 10 min. The reverse-transformed austenite showed an ultra-fine grain size less than 0.2 ㎛, which made it possible to strengthen the high manganese austenitic stainless steel. |