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논문 기본 정보

자료유형
학술저널
저자정보
Young Wha Ma (Doosan Heavy Industries and Construction) Gimo Yang (Metal Lab Inc.) Kee Bong Yoon (Chung-Ang University) Thi Giang Le (Chung-Ang University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12
발행연도
2021.12
수록면
5,165 - 5,172 (8page)
DOI
10.1007/s12540-020-00862-y

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초록· 키워드

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In this work, a Cr35Ni45Nb alloy tube for use in a reformer furnace is subjected to high temperature (871 °C and 927 °C)creep regimes, and the microstructural changes (e.g. carbide precipitation and phase transformation) and consequent creepdamage are investigated. The results of creep tests under closely similar applied stresses give different values of the Larson?Miller parameter (LMP) at different temperatures. As a result, the calculated creep rupture time at 871 °C based on theLMP value measured at 927 °C is approximately twice that which was actually measured at 871 °C. The microstructure ofthe as-cast tube is found to consist of an austenitic matrix with networks of MC (NbC) and eutectic (M23C6) carbides locatedboth at grain boundaries and between dendrites. It is noted that the M23C6carbide is not a primary eutectic carbide that canbe observed in the as-cast Cr35Ni45Nb alloys. It can be argued that the primary eutectic M7C3carbides were transformedinto M23C6due to the heat of spiral welding during the tube manufacturing process. After creep, the NbC carbides at bothlocations were mostly transformed to the G-phase (Nb3Ni2Si) and all the precipitates formed inside the austenitic matrixwere composed of the M23C6and G-phase. Creep cavities were initiated around the G-phase and grew cracks along the grainboundaries due to the formation of a Cr-depleted zone and the G-phase.

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