소듐냉각고속로 압력용기용 Type 316H 스테인리스강의 고온 비탄성 반복변형 거동

• Published in: 대한금속·재료학회지, 53(10) Vol. 53; no. 10; pp. 681 - 687
• Main Authors: 윤지현, Ji Hyun Yoon, 김영춘, Young Chun Kim, 홍석민, Seok Min Hong, 구경회, Gyeong Hoi Koo, 이봉상, Bong Sang Lee
• Format: Journal Article
• Language: Korean
• Published: 대한금속재료학회 05.10.2015; 대한금속·재료학회
• Subjects: dynamic strain aging; inelastic; ratcheting; sodium-cooled fast reactor; Type 316H; 재료공학
• ISSN: 1738-8228; 2288-8241
• DOI: 10.3365/KJMM.2015.53.10.681

Type 316H stainless steel is a primary candidate material for a reactor pressure vessel of a sodium-cooled fast (SFR) reactor which is under development in Korea. The reactor pressure vessel for a SFR is subjected to inelastic deformation induced by cyclic thermal stress. Fully reversed cyclic testing and ratcheting testing at elevated temperatures were performed to characterize the inelastic cyclic deformation behaviors of Type 316H stainless steel at the SFR operating temperature. It was found that cyclic hardening of Type 316H stainless steel was enhanced, and the accumulation of ratcheting deformation of Type 316H stainless steel was retarded at around the SFR operating temperature. The results of the tensile testing and the microstructural investigation for dislocated structures after the inelastic deformation testing showed that dynamic strain aging affected the inelastic cyclic deformation behavior of Type 316 stainless steel at around the SFR operating temperature.