Journal of the Korean Society for Heat Treatment (열처리공학회지)

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

18 Ni 마르에이징 강의 기계적 성질에 미치는 시효처리의 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 : 1991.03.30
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Abstract

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 $840^{\circ}C$ for 1 hr and then aged for various times at $480^{\circ}C$ and $520^{\circ}C$. The main results obtained are as follows : 1) The amounts of reverted austenite are increased up to about 4% at $480^{\circ}C$ and about 22% at $520^{\circ}C$ 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 $480^{\circ}C$ and $520^{\circ}C$. 3) Peak hardness and yield strength are obtained after aging for 4 hrs at $480^{\circ}C$ and 2 hrs at $520^{\circ}C$ 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 $480^{\circ}C$ for 4 hrs and $520^{\circ}C$ for 2 hrs.

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