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논문 기본 정보

자료유형
학술저널
저자정보
Seokmin Hong (Korea Atomic Energy Research Institute) Jaemin Song (Korea Atomic Energy Research Institute) 김민철 (Korea Atomic Energy Research Institute) Kwon-Jae Choi (Korea Atomic Energy Research Institute) Bong-Sang Lee (Korea Atomic Energy Research Institute)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.2
발행연도
2016.1
수록면
196 - 203 (8page)

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The effects of microstructural changes in heavy-section Mn-Mo-Ni low alloy steel on Charpy impact properties were investigated using a 210 mm thick reactor pressure vessel. Specimens were sampled from 5 different positions at intervals of 1/4 thickness from the inner surface to the outer surface. A detailed microstructural analysis of impact-fractured specimens showed that coarse carbides along the lath boundaries acted as fracture initiation sites, and cleavage cracks deviated at prior-austenite grain boundaries and bainite lath boundaries. Upper shelf energy was higher and energy transition temperature was lower at the surface positon, where fine bainitic microstructure with homogeneously distributed fine carbides were present. Toward the center, coarse upper bainite and precipitation of coarse inter-lath carbides were observed, which deteriorated impact properties. At the 1/4T position, the Charpy impact properties were worse than those at other positions owing to the combination of elongated-coarse inter-lath carbides and large effective grain size.

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