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Type 316L 강의 고온 크리프 및 크리프 균열성장 거동
김우곤(Woo-Gon Kim),I.N.C. Kusuma,박재영(Jae-Young Park),이형연(Hyeong-Yeon Lee),김선진(Seon-Jin Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The high-temperature material behaviors of type 316L stainless steel (SS), which is used for a main structural material of a sodium-cooled fast reactor (SFR), were investigated by the tension, creep, and creep crack growth tests. The tension tests were performed at R.T. to 650℃, the creep tests were performed under different applied loads at 600℃ and 550℃, and the creep crack growth (CCG) tests were conducted using 1/2-inch compact tension specimens at 600℃. The creep test data were analyzed using various creep plots and fracture microstructures, and compared with RCC-MRx. The CCG rate (CCGR) for type 316L was constructed using a C* fracture parameter, and the CCGR of type 316L was compared with those of type 316 SS and 316LN. The creep strength decreased with an increase in rupture time, and the creep rate increased with an increase in stress. The rupture ductility decreased slightly with an increase in rupture time. The present tested data showed higher creep strength than that of RCC-MRx, and marginal differences to RCC-MRx in the creep rate. In the CCGR test results, type 316L was lower in the CCGR than type 316SS, and type 316L and 316LN were almost similar in the CCGR.
와이블 분포를 이용한 Grade 91강 용접재의 크리프 수명 예측
박재영(Jae-Young Park),김우곤(Woo-Gon Kim),I.N.C Kusuma,김응선(Eung-Seon Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Grade 91 steel is a promising candidate for the structural materials such as steam generators, intermediate heat exchangers, and hot pipes in a sodium-cooled fast reactor (SFR). Since these structures are designed for up to 60 years at elevated temperatures, the prediction of long-term creep life is very important to determine the allowable design stress of the SFR structures. In this study, a number of creep rupture data were collected through world-wide literature surveys and the data tested in KAERI. Using these data, the long-term creep life was predicted in terms of two methods of typical Larson-Miller (L-M) parameter and Weibull distribution method. Weibull distribution method was proposed as one of creep life prediction methods. The L-M method showed overestimation for longer time of low stress region, but weibull method revealed a reasonable prediction which gradually decreased in creep strength for longer time of low stress region.