마르텐사이트와 오스테나이트 2상 조직을 갖는 202 스테인리스강의 기계적 성질에 미치는 오스테나이트 영향

Abstract

Abstract

The mechanical properties of 202 austenitic stainless steels were investigated using specimens with different volume fractions of retained and reversed austenite, by deformation and reverse annealing treatment after deformation, respectively. The results obtained from this study are as follows: The two phase structure of martensite and retained austenite was obtained by deformation with different temperature and degree of deformation. The two phase structure of martensite and reversed austenite was obtained reverse annealing treatment with different temperature and time after deformation. The ultra fine reverse austenite with less than 0.5㎛ in size was obtained by reverse annealing. As the volume fraction of retained and reversed austenite has increased, strength have rapidly decreased, while elongation has increased. With regard to each austenite, reversed austenite obtained by reverse annealing at 700℃ for different time has indicated higher value of strength, while elongation has suggested a lower value. Tensile properties were affected greatly by obtained by reverse annealing at 700℃ for different time.

Abstract

The mechanical properties of 202 austenitic stainless steels were investigated using specimens with different volume fractions of retained and reversed austenite, by deformation and reverse annealing treatment after deformation, respectively. The results obtained from this study are as follows: The two phase structure of martensite and retained austenite was obtained by deformation with different temperature and degree of deformation. The two phase structure of martensite and reversed austenite was obtained reverse annealing treatment with different temperature and time after deformation. The ultra fine reverse austenite with less than 0.5㎛ in size was obtained by reverse annealing. As the volume fraction of retained and reversed austenite has increased, strength have rapidly decreased, while elongation has increased. With regard to each austenite, reversed austenite obtained by reverse annealing at 700℃ for different time has indicated higher value of strength, while elongation has suggested a lower value. Tensile properties were affected greatly by obtained by reverse annealing at 700℃ for different time.