Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Microstructure and Hardness of 1st layer with Crystallographic Orientation of Solidification Structure in Multipass Weld using High Mn-Ni Flux Cored Wire

고(<24%)Mn 플럭스코어드와이어를 사용한 다층 용접 시 초층 응고조직의 결정면방위에 따른 미세조직과 경도

  • Han, Il-Wook (High-manganese steel specialized solution project team, POSCO) ;
  • Eom, Jung-Bok (Dept. of Advanced Materials and Part of Transportation Systems, Pusan National University) ;
  • Yun, Joong-Gil (Dept. of Material Science and Engineering, Pusan National University) ;
  • Lee, Bong-Geun (High-manganese steel specialized solution project team, POSCO) ;
  • Kang, Chung-Yun (Dept. of Material Science and Engineering, Pusan National University)
  • 한일욱 (포스코 고Mn강 특화 솔루션 프로젝트 팀) ;
  • 엄정복 (부산대학교 수송기기하이테크 소재부품전공학과) ;
  • 윤중길 (부산대학교 재료공학부) ;
  • 이봉근 (포스코 고Mn강 특화 솔루션 프로젝트 팀) ;
  • 강정윤 (부산대학교 재료공학부)
  • Received : 2016.10.17
  • Accepted : 2016.10.24
  • Published : 2016.10.31
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Abstract

In this study, Microstructure and hardness of 1st layer with crystallographic orientation were investigated about solidification structure in multipass weld using high Mn-Ni flux cored wire. Microstructure of solidification consisted of austenite matrix and a little ${\varepsilon}-phase$ in grain boundaries. Orientation of grains was usually (001), (101), (111). According to crystallographic orientation, morphology of primary dendrite was different. The depletion of Fe and the segregation of Mn, C, Ni, Si, Cu, Cr, O were found along the grain boundaries. The area of segregation was wide with an order of (001), (101), (111) grains. And hardness of grains with crystallographic orientation increased with an order of (001), (101), (111) grains because of the segregation along dendrite boundary.

Keywords

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