고 Mn 오스테나이트계 스테인리스강의 감쇠능에 미치는 역변태의 영향

Abstract

This study was carried out to investigate the effect of reverse transformation on the damping capacity in high manganese austenitic stainless steel. The results obtained from this study are as follow : a'-martensite was formed with the specific direction and surface relief by deformation. Over 95% of the austenite phase was transformed to deformation-induced a' - martensite by 70% cold rolling. Reverse transformation became rapid above 550℃ of an annealing temperature, but there was no significant transformation above 700℃. In addition, with increasing annealing time at 700℃, reverse transformation was induced rapidly, but the transformation was almost completed at 10 mins. Damping capacity was increased up to 700℃, and than unchanged with the increasing annealing temperature. Damping capacity was increased steeply with an increase of reverse treatment time up to 10 mins, whereas there was no significant change with treatment time over 10 mins. Damping capacity was increased with an increase of the reversed austenite and was strongly affected by reversed austenite