논문 국내 국제전문학술지(SCI급) 718 초내열합금과 SNCRW강의 이종 마찰용접부의 후열처리에 따른 미세조직 및 기계적 특성평가
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2019-08
- 저자명 김정한,Nam-Yong Kim,Yu Sik Kong,Nho Kwang Park
- 학술지명 대한용접접합학회지
- 발행처명 대한용접접합학회
- 발행국가 국내
- 논문언어 한국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
This study investigated dissimilar friction welding of Alloy 718 to SNCRW stainless steel. After friction welding, the effect of post-weld heat-treatment (PWHT) on the microstructure and mechanical properties was carefully studied. For this purpose, friction welded samples were annealed at 500, 720, and 900 ℃ for 8 hrs, respectively. Heat-treatment at 720 ℃ resulted in highest hardness due to the precipitation of g". On the other hand, relatively low hardness was obtained when PWHT was not performed, or the heat-treatment temperature was not 720 ℃. Residual stress in the welded joints was effectively reduced when heat treatment was performed at temperatures above 720 ℃. Friction welded specimens fractured at the weld joint when no PWHT was performed or when PWHT was performed at 500 or 900 ℃. On the other hand, when PWHT was performed at 720 ℃, tensile failure occurred in the SNCRW base metal.