Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Heat Treatment on Joint Strength of 300Grade 18% Ni Maraging Steel Sheet Welded with Electron Beam

전자비임 용접된 300Grade 18% Ni 마르에이징강 박판의 이음강도에 미치는 열처리의 방향

  • Jung, B.H. (Dept. of Metallurgical Eng., Pusan National University of Technology) ;
  • Kim, H.G. (Dept. of Metallurgical Eng., Pusan National University of Technology) ;
  • Kang, S.B. (Dept. of Metallurgical Eng., Pusan National University of Technology) ;
  • Kim, W.Y. (Dept. of Metallurgical Eng., Pusan National University of Technology) ;
  • Park, H.I. (Dept. of Production & Welding Eng., Pusan National University of Technology)
  • 정병호 (부산공업대학 금속공학과) ;
  • 김한군 (부산공업대학 금속공학과) ;
  • 강순배 (부산공업대학 금속공학과) ;
  • 김우열 (부산공업대학 금속공학과) ;
  • 박홍일 (생산가공공학과)
  • Published : 1993.12.31
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Abstract

The effect and Condition of heat treatment on the tensile strength of welded joint was investigated in 300 grade 18% Ni-Co-Mo-Ti maraging steel sheets welded with electron beam. A good tensile strength of welded joint was obtained by following heat treatment cycle ; At $1100^{\circ}C$ the specimen was high temperature solution treated for 1 hour and then it was repeated solution treated at $900^{\circ}C$, $820^{\circ}C$ for 1 hour respectively to recrystallize the coarsened ${\gamma}$ grain. These heat treatment cycle was completed by an final aging heat treatment at $480^{\circ}C$ for 4 hour. Moreover, dissolution of dendrite, a significant decrease in seregation of Mo, Ti in weld metal were observed and also the coarsened ${\gamma}$ grain formed at $1100^{\circ}C$, $1200^{\circ}C$ changed to fine grain due to the effect of recrystallization.

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