서지주요정보
레늄 첨가가 기계적 합금화한 산화물 분산강화 니켈기 초내열합금의 기계적 성질과 미세구조에 미치는 영향 = Influences of rhenium addition on the mechanical properties and microstructures of MA ODS nickel-base superalloy
서명 / 저자 레늄 첨가가 기계적 합금화한 산화물 분산강화 니켈기 초내열합금의 기계적 성질과 미세구조에 미치는 영향 = Influences of rhenium addition on the mechanical properties and microstructures of MA ODS nickel-base superalloy / 고형수.
저자명 고형수 ; Ko, Hyoung-Soo
발행사항 [대전 : 한국과학기술원, 1996].
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소장정보

등록번호

8006496

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 96004

SMS전송

도서상태

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반납예정일

초록정보

The influences of Re addition on the creep strength and microstructures of MA ODS nickel-base superalloy were investigated. Two different alloys, 8Cr-6.5Al-6W-3Ta-1.5Mo-5Co-1Ti-3Re-0.15Zr-0.01B-0.05C-1.$-1Y_2O_3$(3Re alloy) and non-Re containing(0Re alloy) were prepared for this study. 3Re alloy showed the two fold improvement in creep lives compared with those of 0Re alloy. This is due to the change in precipitate-dislocation interaction mode. For 3Re alloy finer, more cuboidal, and more aligned γ' precipitates are formed, so the mobile dislocations at γ/γ' interfaces must cut the precipitates in order to proceed. Shearing of precipitates accompanied with the formation of stacking faults results in an increase of creep strength. However, lower creep strength was observed for 0Re alloy because a dislocation looping mode was dominant with coarser and more odd-shaped γ' precipitates. Re addition significantly retards γ' coarsening kinetics. The activation energy of 3Re alloy is increased by 18% compared to that of 0Re alloy. Re acts as a rate controlling species upon volume diffusion controlled coarsening process because Re is a heavy element and also it almost solely partitions to the γ matrix. X-ray diffraction experiments showed that the magnitude of the lattice mismatch between γ and γ' increased from 0 to -0.26% at room temperature with 3 wt.% Re addition. This increased lattice mismatch for 3Re alloy causes the formation of more aligned and cuboidal γ' precipitates rather than random and odd-shaped γ' precipitates.

서지기타정보

서지기타정보
청구기호 {MMS 96004
형태사항 iii, 78 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyoung-Soo Ko
지도교수의 한글표기 : 백경욱
지도교수의 영문표기 : Kyung-Wook Paik
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 77-78
주제 조대화 속도
평형모양
레늄첨가 영향
Coarsening Rate
Equilibrium Shape Of Particle
Re Addition Effect
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