Journal of Welding and Joining

  • 제32권4호
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  • Pages.26-33
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  • 2014
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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슈퍼듀플렉스 스테인리스강 UNS S32750과 탄소강 A516-70의 이종금속 FCA 용접 특성에 대한 연구

A Study on Characteristics of Dissimilar Welds between Super Duplex Stainless Steel UNS S32750 and Carbon Steel A516-70 with FCAW

  • 문인준 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 장복수 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 김세철 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 고진현 (한국기술교육대학교 에너지.신소재.화학공학부)
  • Moon, In-June (School of Energy?Materials?Chemical, Korea University of Technology and Education) ;
  • Jang, Bok-Su (School of Energy?Materials?Chemical, Korea University of Technology and Education) ;
  • Kim, Se-Cheol (School of Energy?Materials?Chemical, Korea University of Technology and Education) ;
  • Koh, Jin-Hyun (School of Energy?Materials?Chemical, Korea University of Technology and Education)
  • 투고 : 2014.02.12
  • 심사 : 2014.04.22
  • 발행 : 2014.08.31
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초록

The metallurgical and mechanical characteristics, toughness and corrosion resistance of dissimilar welds between super duplex stainless steel UNS S32750 and carbon steel ASTM A516Gr.70 have been evaluated. Three heat inputs of 21.12, 24.00, 26.88kJ/cm were employed to make joints of dissimilar metals with flux cored arc welding(FCAW). Based on microstructural examination, vermicular ferrite was formed in the first layer of weld at low heat input(21.12kJ/cm) and $Cr_{eq}/Ni_{eq}$ of 1.61 while acicular ferrite was formed in last layer of weld at high heat input(26.88kJ/cm) and $Cr_{eq}/Ni_{eq}$ of 1.72. Ferrite percentage in dissimilar welds was lowest in the first layer of weld regardless of heat inputs and it gradually increased in the second and third layers of weld. Heat affected zone showed higher hardness than the weld metal although reheated zone showed lower hardness than weld metal due to the formation of secondary austenite. Tensile strengths of dissimilar welds increased with heat input and there was 100MPa difference. The corrosion test by ferric chloride solution showed that carbon steel had poor corrosion resistance and pitting corrosion occurred in the first layer(root pass) of weld due to the presence of reheated zone where secondary austenite was formed. The salt spray test of carbon steel showed that the surface only corroded but the amount of weight loss was extremely low.

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참고문헌

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