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18 Ni 마르에이징 강의 기계적 성질에 미치는 Mo 첨가량의 영향
김학모,김인배,박세윤 ( Hak Mo Kim,In Bae Kim,Se Yoon Park ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.3
Effects of Mo content and aging conditions on the amount of retained austenite and mechanical properties of 18 Ni maraging steels were investigated. Maraging steels were fabricated with variation of Mo content, 3, 5, 7, 9% and heat treated by austenitizing at 840℃ for 1 hour and then aged at 480℃ for 0.5∼100 hours. It was found that the amount of retained austenite after aolution treatment was negligible up to 5% Mo. 8 and 11 volume percents of retained austenite were obtained with 7 and 9% Mo respectively. The maximum hardness and yield strength without great loss of impact toughness were attained in the range of 4∼8 hours of aging time at 480℃ with 5% Mo. It was concluded, as a result, that the optimum Mo content for the good combination of strength and toughness is to be 5% Mo.
18Ni 마르에이징 강의 기계적 성질에 미치는 시효처리의 영향
김학모,김인배,박세윤 ( Hak Mo Kim,In Bae Kim,Se Yoon Park ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.1
Effects of aging treatment on the mechanical properties of a 18 Ni maraging steel were investigated by considering the reverted austenite. Specimens were heat treated by austenitizing at 840℃ for 1 hr and then aged for various times at 480℃ and 520℃. The main results obtained are as follows : 1) The amounts of reverted austenite are increased up to about 4% at 480℃ and about 22% at 520℃ with 1 to 48 hrs aging time. 2) Decreasing tendencies of impact energy and fracture toughness with increasing aging time are diminished after aging for 2 hrs at two aging temperatures of 480℃ and 520℃. 3) Peak hardness and yield strength are obtained after aging for 4 hrs at 480℃ and 2 hrs at 520℃ respectively. From the above results, it was concluded that the optimum aging condition with which showed good strength and toughness combination are given to be 480℃ for 4 hrs and 520℃ for 2 hrs.