Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Impact Toughness and Microstructure of the Weld Metal by Tandem Electro-Gas Welded EH40 Steel

EH40 강의 Tandem EGW 용접부 미세조직과 충격인성 특성

  • Park, Tae Gyu (Dept. of Materials Science and Engineering, Changwon National University) ;
  • Kim, Jeon Min (Dept. of Materials Science and Engineering, Changwon National University) ;
  • Yoon, Hye Young (Dept. of Materials Science and Engineering, Changwon National University) ;
  • Lee, Je Hyun (Dept. of Materials Science and Engineering, Changwon National University) ;
  • Chung, Won Jee (Dept. of Mechatronics Engineering, Changwon National University) ;
  • Kim, Ho Kyeong (R&D Center, STX Offshore & Shipbuilding Co.)
  • 박태규 (창원대학교 나노신소재공학부) ;
  • 김정민 (창원대학교 나노신소재공학부) ;
  • 윤혜영 (창원대학교 나노신소재공학부) ;
  • 이재현 (창원대학교 나노신소재공학부) ;
  • 정원지 (창원대학교 메카트로닉스 공학부) ;
  • 김호경 (STX 조선해양(주) 기술연구소)
  • Received : 2010.05.20
  • Published : 2010.11.25
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Abstract

The charpy impact property was lower at the surface and middle regions than that at the root region in metal welded by Tandem EGW of 82 mm thick EH40-TM steel plates. Temperature distribution in the weld sample and the heating/cooling temperature throughout the various regions in the weld metal were estimated by the commercial weld simulation program SYSWELD. The microstructure of the weld metal consisted of acicular ferrite and grain boundary ferrite. Grain boundary ferrite in the acicular ferrite matrix was found more in the surface and middle regions than in the root region, and the acicular ferrite was also coarser in the surface and middle regions where the impact toughness was lower and the input temperature was higher. Our results indicated that the impact toughness property was related to the microstructure morphology, the distribution of grain boundary ferrite, and the acicular ferrite.

Keywords

Acknowledgement

Supported by : 한국산업기술재단

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