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한국주조공학회> 한국주조공학회지 (주조)

한국주조공학회지 (주조) update

JOURNAL OF THE KOREAN FOUNDRYMENS SOCIETY

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수록범위 : 1권1호(1981)~38권2호(2018) |수록논문 수 : 2,034
한국주조공학회지 (주조)
38권2호(2018년 04월) 수록논문
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KCI등재

1Sr 개량처리된 사형주조 Al-7Si-0.35Mg 합금의 열처리에 따른 공정 Si상 변화거동 및 특성평가

저자 : 김명균 ( Myoung-gyun Kim ) , 황석민 ( Seok-min Hwang )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 38권 2호 발행 연도 : 2018 페이지 : pp. 1-8 (8 pages)

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In this study, we focused on the correlation between the solidification structure, heat treatment and mechanical properties of the A356 alloy according to the conditions of Sr modification. The microstructural evolution of the eutectic Si and α-Al phase in the A356 alloy castings depending on the amount of Sr were investigated during solid solution heat treatment using an optical microscope, a scanning electron microscope and an image analyzer. In addition, tensile tests on the heat treated materials examined the relationship between the microstructure and the fracture surface. The as-cast A356 alloys under 40 ppm Sr showed an undermodified microstructure, but that of the added 60-80 ppm Sr had well modified structure of fine fibrous silicon. After solid solution treatment, the microstructure of the undermodified A356 alloy exhibited a partially spheroidized morphology, but the remainder showed the fragmentation of fibrous shaped silicon. The spheroidization of the eutectic silicon in the modified A356 alloys was completed during heat treatment, which was very effective in increasing the elongation. This is supported by the fracture surface in the tensile test.

KCI등재

2전자기 연속 주조법을 이용한 의료용 타이타늄 합금 제작에 관한 연구

저자 : 최수지 ( Su-ji Choi ) , 이현재 ( Hyun-jae Lee ) , 백수현 ( Su-hyun Baek ) , 현승균 ( Soong-k

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 38권 2호 발행 연도 : 2018 페이지 : pp. 9-15 (7 pages)

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Electromagnetic continuous casting (EMCC) was used to fabricate Ti-6Al-4V alloys with properties suitable for medical applications. Ti-6Al-4V alloy ingots fabricated by EMCC were subjected to heat treatment, such as residual stress removing (RRS), furnace cooling after solution treatment (ST-FC) and water-cooling after solution treatment (ST-WC), in order to obtain characteristics suitable for the standard. After component analysis, the microstructure and mechanical properties (tensile strength and elongation) were evaluated by ICP, gas analysis, OM, SEM, a Rockwell hardness tester and universal testing machine. The Ti-6Al-4V alloy ingot fabricated by EMCC was fabricated without segregation, and the lamellar structure was observed in the RRS and ST-FC specimens. The ST-WC specimen showed only martensite structure. As a result of evaluating the mechanical properties based on the microstructure results, we found that the water-cooled heat treatment condition after the solution treatment was most suitable for the Ti-6Al-4V ELI standard.

KCI등재

3이중복합 주조체의 제조에 미치는 구성 재질과 주조 조건의 영향

저자 : 정재영 ( Jae-young Jung )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 38권 2호 발행 연도 : 2018 페이지 : pp. 16-26 (11 pages)

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In this study, the effects of the pouring temperature, preheating temperature, surface condition and fraction of the wear resistant part on the production of duo-castings were investigated using a high Cr white cast iron with excellent abrasion resistance and a low Cr alloy steel with good toughness. The constituent materials of the duo-castings were designed to have high hardness, fracture toughness and abrasive wear resistance for the replacement of high Mn alloy steels with low abrasive wear resistance. In particular, the amount of abrasive wear of 17% Cr white cast iron was about 1/20 of that of high Mn alloy steel. There was an intermediate area of about 3mm due to local melting at the bonding interface of the duo-castings. These intermediate regions were different from those of the constituent materials in chemical composition and microstructure. This region led to fracture within the wear resistant part rather than at the bonding interface in the bending strength test. The bending fracture strengths were 516-824 MPa, which were equivalent to the bending proof strength of high Mn steel. The effects of various casting conditions on the duo-cast behavior were studied by simple pouring of low Cr alloy steel melt, but the results proved practically impossible to manufacture duo-castings with a sound bonding interface. However, the external heating method was suitable for the production of duo-castings with a sound bonding interface.

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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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전북대학교 한국생산기술연구원 금오공과대학교 경남과학기술대학교 영남대학교
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