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한국주조공학회> 한국주조공학회지 (주조)

한국주조공학회지 (주조) update

JOURNAL OF THE KOREAN FOUNDRYMENS SOCIETY

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  • : 주조(~2000)→한국주조공학회지(2001~)

수록정보
수록범위 : 1권1호(1981)~37권5호(2017) |수록논문 수 : 2,022
한국주조공학회지 (주조)
37권5호(2017년) 수록논문
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1Hastelloy X 주조재의 열간 노출에 따른 미세조직 및 인장 특성 변화

저자 : 최백규 ( Baig Gyu Choi ) , 김인수 ( In Soo Kim ) , 도정현 ( Jeonghyeon Do ) , 정중은 ( Joong

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 37권 5호 발행 연도 : 2017 페이지 : pp. 139-147 (9 pages)

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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 M6C and fine M23C6 carbides were found in as-cast Hastelloy X with fine carbides on sub-boundary. Some of M23C6 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℃ and the solution heat treated specimen. A large amount of M23C6 carbides precipitated along and near grain boundaries and sub-boundaries after exposure at 650℃. Expo-sure at 870℃ of the alloy caused precipitation of M6C and μ. The strength increased and the elongation decreased by thermal expo-sure at 650℃ and 870℃ 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.

KCI등재

2AC4A 알루미늄 합금의 주조특성에 미치는 미량 첨가원소의 영향

저자 : 오승환 ( Seung-hwan Oh ) , 김헌주 ( Heon-joo Kim )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 37권 5호 발행 연도 : 2017 페이지 : pp. 148-156 (9 pages)

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The effects of minor additives on the casting properties of AC4A aluminum alloys were investigated. Measurements of the cool-ing curve and microstructure observations were conducted to analyze the effects of Ti-B and Sr minor elements during the solid-ification process. A fine grain size and an increase in the crystallization temperature for the α-Al solution were evident after the addition of 0.1wt% Al-5%Ti-1%B additive. The modification effect of the eutectic Mg2Si phase with the addition of 0.05% Al- 10%Sr additive was prominent. A fine eutectic Mg2Si phase and a decrease in the growth temperature of the eutectic Mg2Si phase were evident. Fluidity, shrinkage and solidification-cracking tests were conducted to evaluate the castability of the alloy. The com-bined addition of Al-5%Ti-1%B and Al-10%Sr additives showed the maximum filling length owing to the effect of the fine α-Al grains. The macro-shrinkage ratio increased, while the micro-shrinkage ratio decreased with the combined addition of Al-5%Ti-1%B and Al-10%Sr additives. The macro-shrinkage ratio was nearly identical, while the micro-shrinkage ratio increased with the addition of the Al-10%Sr additive. The tendency of the occurrence of solidification cracking decreased owing to the effect of the fine α-Al grains and the modification of the Mg2Si phase with the combined addition of Al-5%Ti-1%B and Al-10%Sr additives.

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3AA 2014 알루미늄 합금의 고상율에 따른 미세조직 및 반응고 변형 거동

저자 : 한도석 ( Do-suck Han )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 37권 5호 발행 연도 : 2017 페이지 : pp. 157-163 (7 pages)

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In the present study, the microstructural evolution and deformation behavior of AA 2014 aluminum alloys with different micro-structures in a semi-solid state were investigated. For a given alloy, applied load and deformation time, the measured strain was higher at a higher temperature, indicative of a lower solid fraction. When a large proportion of the liquid was present as intra-granular droplets, the alloy would not as easily deform because the effective liquid fraction between the solid grains had decreased. Greater deformation was achieved with higher grain boundary misorientations due to the enhanced wetting of the grain boundaries with liquid. A semi-empirical constitutive model is proposed for semi-solid deformation under the conditions in the present study. The mechanism of semi-solid deformation incorporates the initial flow of the liquid in the early stages of deformation, followed by a more gradual increase in the strain due to deformation by grain sliding accompanied by self-diffusion in the solid grains.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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(2006)홍길동심리학41회 피인용

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(2006)홍길동41회 피인용

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부산대학교 서울과학기술대학교(구 서울산업대학교) 부경대학교 전북대학교 계명대학교
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