Proceedings of the KAIS Fall Conference (한국산학기술학회:학술대회논문집)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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The effect of PWHT on the mechanical properties of HSB600 steel

HSB600강의 용접 후 열처리에 따른 기계적 특성 변화 연구

  • Lim, Young-Min (Dept. of Materials Engineering, Korea university of Technology and Education) ;
  • Ju, Dong-Hwi (Dept. of Materials Engineering, Korea university of Technology and Education) ;
  • Kim, Nam-Hoon (Dept. of Materials Engineering, Korea university of Technology and Education) ;
  • Koh, Jin-Hyun (Dept. of Materials Engineering, Korea university of Technology and Education)
  • 임영민 (한국기술교육대학교 신소재공학과) ;
  • 주동휘 (한국기술교육대학교 신소재공학과) ;
  • 김남훈 (한국기술교육대학교 신소재공학과) ;
  • 고진현 (한국기술교육대학교 신소재공학과)
  • Published : 2011.05.27
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Abstract

The effects of heat input(1.5~3.6kJ/mm) and postweld heat treatment(PWHT, $600^{\circ}C$, 40hr.) on the TMCP HSB600 steel weldments made by GMAW process were investigated. The tensile strength and CVN impact energy of as-welded specimens decreased with increasing heat input. The fine-grained acicular ferrite was mainly formed in the low heat input while polygonal and side plate ferrites were dominated in the high inputs. Meanwhile, tensile strength and hardness of PWHT weldments decreased due to the coarsening of microstructure and reduction of residual stresses.

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