구상화 열처리한 Cr-Mo강의 오스테나이트화 온도가 기계적 성질에 미치는 영향 = Research Effect of Austenitizing Temperature on Mechanical Properties in the Spheroidized Cr-Mo Steel

다국어 초록 (Multilingual Abstract)

Effect of austenitizing temperatures on the impact value of the AISI 4140 steel after repetition of spheroidization and cold deep drawing treatment has been studied. Sufficient dissolution of carbide was shown after austenitizing at the high temperature of 950℃. Accordingly, the impact value was remarkably increased by tempering of this high temperature austenitized steel at the tempering temperature ranges between 570℃ and 630℃. On the other hand, remarkable decrease in the impact values and elongations were shown by tempering the low temperature-austenitized(870℃) steel due to the coarsening of undissolved-carbide existed at the austenitizing temperature.