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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.