Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Content on the Mechanical Properties of a 18 Ni Maraging Steel

18 Ni 마르에이징 강의 기계적 성질에 미치는 Mo 첨가량의 영향

  • Kim, Hak-Mo (Dept. of Metallugical Engineering, Pusan National University) ;
  • Kim, In-Bae (Dept. of Metallugical Engineering, Pusan National University) ;
  • Park, Se-Yoon (Dept. of Metallugical Engineering, Pusan National University)
  • 김학모 (부산대학교 공과대학 금속공학과) ;
  • 김인배 (부산대학교 공과대학 금속공학과) ;
  • 박세윤 (부산대학교 공과대학 금속공학과)
  • Published : 1991.09.30
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Abstract

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 $840^{\circ}C$ for 1 hour and then aged at $480^{\circ}C$ 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 $480^{\circ}C$ 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.

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