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. <TEX>${\alpha}^{\prime}$</TEX>-martensite was formed with the specific direction and surface relief by deformation. Over 95% of the austenite phase was transformed to deformation-induced <TEX>${\alpha}^{\prime}$</TEX>-martensite by 70% cold rolling. Reverse transformation became rapid above an annealing temperature of <TEX>$550^{\circ}C$</TEX>, but there was no significant transformation above <TEX>$700^{\circ}C$</TEX>. In addition, with increasing annealing time at <TEX>$700^{\circ}C$</TEX>, reverse transformation was induced rapidly, but the transformation was almost completed at 10 min. Damping capacity was increased up to <TEX>$700^{\circ}C$</TEX>, and than unchanged with the increasing annealing temperature. Damping capacity increased steeply with an increasing reverse treatment time up to 10min, whereas there were no significant change with a treatment time of more than 10 min. Damping capacity increased with an increasing the reversed austenite and was strongly affected by reversed austenite.