Hastelloy X 주조재의 열간 노출에 따른 미세조직 및 인장 특성 변화

최백규; 김인수; 도정현; 정중은; 정인용; 홍현욱; 조창용

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자료유형: 학술저널

저자정보: 최백규 (재료연구소 내열재료연구실) 김인수 (재료연구소 내열재료연구실) 도정현 (재료연구소 내열재료연구실) 정중은 (재료연구소 내열재료연구실) 정인용 (재료연구소 내열재료연구실) 홍현욱 (창원대학교 신소재공학부) 조창용 (재료연구소 내열재료연구실)

저널정보: 한국주조공학회 한국주조공학회지 (주조) 한국주조공학회지 제37권 제5호

발행연도: 2017.1

수록면: 139 - 147 (9page)

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연구결과

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Microstructural evolution of cast Hastelloy X during thermal exposure has been investigated. OM, SEM, and TEM microscopy were carried out on the as-cast, the standard heat treated, and the thermally exposed conditions. Tensile tests were also conducted to understand the effect of microstructural evolution on the degradation of tensile properties. Coarse $M_6C$ and fine $M_{23}C_6$ carbides were found in as-cast Hastelloy X with fine carbides on sub-boundary. Some of $M_{23}C_6$ carbide dissolved into the matrix during solution heat treatment and dislocation network formed at the interface between the carbide and the matrix due to the misfit strain. There was no significant microstructural difference between the exposed specimens at $400^{\circ}C$ and the solution heat treated specimen. A large amount of $M_{23}C_6$ carbides precipitated along and near grain boundaries and sub-boundaries after exposure at $650^{\circ}C$. Exposure at $870^{\circ}C$ of the alloy caused precipitation of $M_6C$ and ${\mu}$. The strength increased and the elongation decreased by thermal exposure at $650^{\circ}C$ and $870^{\circ}C$ because carbides interfere with the movement of the dislocation. It was found that the precipitation of carbide gave significant effects on the tensile properties of Hastelloy X.

#Hastelloy X #Thermal exposure #Carbide #Microstructure #Tensile properties

참고문헌 (11)

참고문헌 신청

Tawancy HM / 1983 / Long-term ageing characteristics of Hastelly Alloy X / J. Mater. Sci 18:2976~2986

Zhao JC / 2000 / Phase precipitation and time-temperature-transformation diagram of Hastelloy X / Mater. Sci. Eng. A A293:112~119

Lai, GY / 1978 / An investigation of the thermal stability of a commercial Ni-Cr-Fe-Mo alloy (Hastelloy Alloy X) / Metall. Trans. A 9A:827~833

Matthews, SJ / 1976 / Thermal stability of solid solution strengthened high performance alloys / Superalloys :215~226

Li XM / 2010 / Microstructure evolution of a novel super304H steel aged at high temperatures / Mater. Trans 51:305~309

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