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논문 기본 정보

자료유형
학술저널
저자정보
강희재 (동아대학교) 김정민 (동아대학교) 지성환 (동아대학교) 성지현 (대구기계부품연구원) 김영희 (동아대학교) 성장현 (동아대학교) 전언찬 (동아대학교)
저널정보
Korean Society for Precision Engineering Journal of the Korean Society for Precision Engineering 한국정밀공학회지 Vol.30 No.3
발행연도
2013.3
수록면
271 - 277 (7page)

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초록· 키워드

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Inconel 718 super alloy was aging heat treated at the temperature range from 675°C to 785°C for 5~40 hours after solution annealing at 1025°C for 1 hour. The aging treated specimens were investigated microstructure, mechanical properties and thermal expansion/contraction. Precipitates appeared for a long time aging treatment were niobium carbide and also γ’ phase. For the aging treatment time of 10 hours, the changes in strength and hardness with increasing aging treatment temperature showed the maximum value at the temperature of 725°C. This maximum value is to be related with the precipitation of γ’ and γ’’ phases. The decrease in strength, elongation and hardness during long time aging at 725°C were thought to be induced from the coarsening of the grain size and the transformation of γ’’ phase to γ’ phase. For the specimens treated for 10 hours, impact energy showed constant value of ~105 J with increasing the aging temperature, however this value continuously decreased with elapsing time at the aging temperature of 725°C. It was found that the decrease in impact value was induced from the coarsening of grain size and the carbide coarsening. The coefficient of thermal expansion of aging treated Inconel 718 alloy increased with raising test temperature, and the coefficient was appeared 11.57~12.09 ㎛/m?°C and 14.28~14.39 ㎛/m?°C, respectively, after heating to 150°C and 450°C.

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UCI(KEPA) : I410-ECN-0101-2014-555-000301165