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논문 기본 정보

자료유형
학술저널
저자정보
Eun Hee Jeong (Hanyang University) Jun Hwan Kim (Korea Atomic Energy Research Institute (KAERI)) Sung Ho Kim (Korea Atomic Energy Research Institute (KAERI)) Young Do Kim (Hanyang University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.5
발행연도
2021.1
수록면
985 - 994 (10page)

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초록· 키워드

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In this study, precipitation strengthening alloying elements (C, N, V, Nb, Ta) and solution strengthening alloying elements(Cr, W, Mo, B) were appropriately combined to fabricate FC92B and FC92N alloys. Long-term aging heat treatments at650 °C of up to 20,000 h were conducted to compare the high-temperature properties of each alloy, investigate the effectsof microstructure stability on creep performance characteristics, and analyze the precipitate growth behavior in relation tothe long-term thermal stability of the precipitate phase. Transmission electron microscopy and nanoscale secondary ionmass spectrometry were carried out to investigate microstructural changes according to the aging treatment time and themicrostructure of creep specimens in relation to the addition of trace alloying elements. Although FC92B contains a higherB content than FC92N, FC92B did not exhibit significant changes in hardness or tensile strength regardless of the agingtime, which extended to a maximum of 20,000 h. The FC92B alloy with an adequate addition of B showed the highest creepperformance and exhibited rupture durations that were more than twice those of FC92N under stress conditions of 100 MPaand 140 MPa at 650 °C. The precipitate size of FC92N was significantly coarser than that of FC92B. In FC92B aged for20,000 h, B was distributed in the grain boundaries, as shown by Nano-Secondary Ion Mass Spectrometry. B content wasfound to be high within the M23C6precipitate.

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