A Study on Relationship between Hot Ductility Behavior and Hot Cracking Susceptibility in PTA Weld of Ni-based Superalloy

니켈기 초내열합금 PTA용접부의 고온균열감수성과 고온연성거동에 관한 연구

  • 이청래 (한양대학교 대학원 재료공학과) ;
  • 김성욱 (한양대학교 대학원 재료공학과) ;
  • 최우혁 (한양대학교 대학원 재료공학과) ;
  • 엄상호 (한양대학교 대학원 재료공학과) ;
  • 이창희 (한양대학교 재료공학과) ;
  • 김재철 (한전전력연구원 발전연구소) ;
  • 최철 (한전전력연구원 발전연구소)
  • Published : 2003.05.01


In general, nickel-base superalloy has been extensively used as land-based gas turbine blades and vanes. Plasma transferred arc welding(PTAW) has been considered as a repair welding process of nickel-base superalloy. This research evaluated the relationship between hot ductility behavior and hot cracking susceptibility in nickel-base superalloys. Ductility recovery rate of nickel base superalloys was found to be poor due to incipient melting and constitutional liquation. This seems to increase the hot cracking susceptibility.