주조 합금 Alloy 718에서 미세조직과 인장특성에 미치는 열처리의 영향

도정현; 김인수; 최백규; 정중은; 정인용; 조창용

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자료유형: 학술저널

저자정보: 도정현 (한국기계연구원 부설 재료연구소 내열재료연구실) 김인수 (한국기계연구원 부설 재료연구소 내열재료연구실) 최백규 (한국기계연구원 부설 재료연구소 내열재료연구실) 정중은 (한국기계연구원 부설 재료연구소 내열재료연구실) 정인용 (한국기계연구원 부설 재료연구소 내열재료연구실) 조창용 (한국기계연구원 부설 재료연구소 내열재료연구실)

저널정보: 한국주조공학회 한국주조공학회지 (주조) 한국주조공학회지 제36권 제5호

발행연도: 2016.1

수록면: 167 - 173 (7page)

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연구결과

초록· 키워드

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The effect of various types of heat-treatment on the mechanical properties of cast Alloy 718 has been investigated. Cast Alloy 718 bars were subjected to 'standard heat-treatment'_(SHT), 'HIP (Hot Isostatic Pressing) heat-treatment'_(HHT), and 'HIP-simulated heat-treatment'_(HS). In the absence of long time high temperature heat-treatment, a small amount of Laves phase remained in the 'SHT' specimen, and needle shaped ${\delta}$ precipitated in the vicinity of the Laves phase. Due to the formation of the Laves and ${\delta}$ phases in the 'SHT' specimen, it exhibited lower tensile properties than those of the others_specimens. On the other hand, the Laves phase was completely dissolved into the matrix after 'HHT' and 'HS' treatments. It is known that isostatic pressure reduces the self-diffusion coefficient, because of the lower self-diffusivity under HIP conditions in the interdendritic region, Nb segregation and the high amount of ${\gamma}^{{\prime}{\prime}}$ precipitation that occurs. Due to the higher fraction of coarse ${\gamma}^{{\prime}{\prime}}$ phases, the 'HHT' treated Alloy 718 showed excellent tensile strength.

#Cast Alloy 718 #Segregation #${gamma}^{{prime}{prime}}$ strengthening #HIP #Heat-treatment

참고문헌 (13)

참고문헌 신청

H. L. Eiselstein / 1965 / Advances in the Technology of Stainless Steels and Related Alloys, STP 369 / ASTM

D.D. Krueger / 1989 / Proc. Superalloy 718-Metallurgy and Applications. Conf. Superalloy 718-Metallurgy and Applications / TMS :279

Jeong YK / 2000 / Effects of δ phase and cold phase and cold drawing ratio on the LCF properties of Alloy 718 wire / Metals and Materials 6:423

M. Sundararaman / 1992 / Some aspects of the precipitation of metastable intermetallic phases in Inconel 718 / Metall. Trans. A 23A:2015~2018

D.Fournier / 1977 / Low-cycle fatigue behavior of inconel 718 at 298 K and 823 K / Metall. Trans. A 8A:1095~1105

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