압연 온도 및 압연량에 따르는 202 오스테나이트계 스테인리스강의 기계적 및 탄성파 특성

Abstract

In this study, high-cost Cr and Ni components of 202 austenitic stainless steel were reduced, low-cost Mn was added, and the amount of martensite and mechanical properties were evaluated according to rolling temperature and rolling degree. In addition, the acoustic wave generated by internal deformation during tension test was detected, and the dominant frequency according to the amount of martensite was investigated by wavelet analysis. Part of the austenite was transformed into -martensite by rolling. More martensite was generated as the rolling degree was increased, and more martensite was generated as the rolling temperature decreased in the same rolling degree. The amount of martensite rapidly increased up to a rolling degree of 33%, and then gradually increased thereafter. In particular, the amount of martensite at rolling temperature of -196℃ was similar after the rolling degree of 33%. Vickers hardness and tensile (yield) strength increased as the rolling temperature decreased and the rolling degree increased. The elongation decreased rapidly. The dominant frequency decreased after increasing as the rolling degree increased at each rolling temperature, and the highest value was shown at 33% of the rolling degree.