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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제46권 제3호
발행연도
2014.1
수록면
413 - 422 (10page)

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Presented in this study are the variations of microstructures and mechanical properties with tempering and Post-Weld HeatTreatment (PWHT) conditions for SA508 Gr.4N steel used as Reactor Pressure Vessel (RPV) material. The blocks of modelalloy were austenitized at the conventional temperature of 880 ºC, then tempered and post-weld heat treated at four differentconditions. The hardness and yield strength decrease with increased tempering and PWHT temperatures, but impact toughnessis significantly improved, especially in the specimens tempered at 630 ºC. The sample tempered at 630 ºC with PWHT at 610 ºCshows optimum mechanical properties in hardness, strength, and toughness, excluding only the transition property in the lowtemperature region. The microstructural observation and quantitative analysis of carbide size distribution show that thevariations of mechanical properties are caused by the under-tempering and carbide coarsening which occurred during the heattreatment process. The introduction of PWHT results in the deterioration of the ductile-brittle transition property by anincrease of coarse carbides controlling cleavage initiation, especially in the tempered state at 630 ºC.

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