Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effects of Serrated Grain Boundary Structures on Boron Enrichment and Liquation Cracking Behavior in the Simulated Weld Heat-Affected Zone of a Ni-Based Superalloy

니켈기 초내열합금의 파형 결정립계 구조가 보론 편석과 재현 열영향부 액화균열거동에 미치는 영향

  • Hong, Hyun-Uk (Department of Materials Science and Engineering, Changwon National University) ;
  • Choi, June-Woo (Department of Materials Science and Engineering, Changwon National University) ;
  • Bae, Sang-Hyun (Department of Materials Science and Engineering, Changwon National University) ;
  • Yoon, Joong-Geun (Department of Materials Science and Engineering, Changwon National University) ;
  • Kim, In-Soo (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Choi, Baig-Gyu (High Temperature Materials Research Group, Korea Institute of Materials Science) ;
  • Kim, Dong-Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Jo, Chang-Yong (High Temperature Materials Research Group, Korea Institute of Materials Science)
  • 홍현욱 (창원대학교 신소재공학부) ;
  • 최준우 (창원대학교 신소재공학부) ;
  • 배상현 (창원대학교 신소재공학부) ;
  • 윤중근 (창원대학교 신소재공학부) ;
  • 김인수 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 최백규 (한국기계연구원 부설 재료연구소 내열재료연구실) ;
  • 김동진 (한국원자력연구원 원자력재료연구부) ;
  • 조창용 (한국기계연구원 부설 재료연구소 내열재료연구실)
  • Received : 2013.01.22
  • Accepted : 2013.06.03
  • Published : 2013.06.30
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Abstract

The transition of serrated grain boundary and its effect on liquation behavior in the simulated weld heat-affected zone (HAZ) have been investigated in a wrought Ni-based superalloy Alloy 263. Recently, the present authors have found that grain boundary serration occurs in the absence of adjacent coarse ${\gamma}^{\prime}$ particles or $M_{23}C_6$ carbides when a specimen is direct-aged with a combination of slow cooling from solution treatment temperature to aging temperature. The present study was initiated to determine the interdependence of the serration and HAZ property with a consideration of this serration as a potential for the use of a hot-cracking resistant microstructure. A crystallographic study indicated that the serration led to a change in grain boundary character as special boundary with a lower interfacial energy as those terminated by low-index {111} boundary planes. It was found that the serrated grain boundaries are highly resistant to boron enrichment, and suppress effectively grain coarsening in HAZ. Furthermore, the serrated grain boundaries showed a higher resistance to susceptibility of liquation cracking. These results was discussed in terms of a significant decrease in interfacial energy of grain boundary by the serration.

Keywords

References

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