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한국주조공학회> 한국주조공학회지 (주조)

한국주조공학회지 (주조) update

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  • : 주조(~2000)→한국주조공학회지(2001~)

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수록범위 : 1권1호(1981)~39권6호(2019) |수록논문 수 : 2,052
한국주조공학회지 (주조)
39권6호(2019년 12월) 수록논문
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1Cu 첨가에 따른 SKD11의 기계적, 열적 특성 변화

저자 : 최광묵 ( Gwang Mook Choi ) , 채홍준 ( Hong-jun Chae )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 39권 6호 발행 연도 : 2019 페이지 : pp. 103-109 (7 pages)

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Cu-added SKD11 was manufactured through the casting process and the effects of Cu addition with different contents (0, 1, 2 and 3 wt%) and aging treatment on microstructure, mechanical characteristics such as tensile strength and hardness, and thermal conductivity were investigated. The microstructure was analyzed by FE-SEM and XRD, the mechanical characteristics by Rockwell hardness tester and Tensile tester, and the thermal conductivity by Laser flash. As a result, SKD11 containing Cu had higher hard­ness than as-received SKD11. The hardness of as-cast SKD11 containing 1 wt% Cu was 42.4 HRC, whereas the hardness of as­received SKD11 cast alloy was 19.5 HRC, indicating that the hardness was greatly improved when Cu was added. In the case of tensile strength, Cu-added SKD11 cast alloy had lower tensile strength than as-received SKD11, and the tensile strength tended to increase as Cu content increased. After heat treatment, however, tensile strength of as-received SKD11 was significantly increased, whereas in the case of Cu-added SKD11, as the Cu contents increased, the tensile strength increased less and even reduced at 3 wt% Cu. The thermal conductivity of Cu-added SKD11 cast alloy was about 13 W m-1 K-1, which was lower than that of the as­received SKD11 cast alloy (28 W m-1 K-1). After the heat treatment, however, the thermal conductivity of as-received SKD11 was reduced, while the thermal conductivity of the SKD11 added with Cu was increased. Thermal conductivity was generally larger with less Cu content, and this tendency became more pronounced after heat treatment.

KCI등재

2Ti-6Al-4V 합금에서 상 변화를 고려한 Selective Laser Melting 프로세스 연구

저자 : 송성일 ( Seong-il Song ) , 박주헌 ( Joo-heon Park ) , 진병주 ( Byeong-ju Jin ) , 이경돈 ( Kyoung-don Lee )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 39권 6호 발행 연도 : 2019 페이지 : pp. 110-115 (6 pages)

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Recently, various studies have been conducted on additive manufacturing technology developed using metal materials. In this study, a numerical analysis was introduced to analyze the effects of the thermal deformation and residual stress which arise during the SLM (selective laser melting) manufacturing process. A phase-transformation mechanism is implemented with the use of the Ti- 6Al-4V material, in which a solid-state phase transformation (SSPT) can be induced during a numerical analysis. In this case, the phase of the Ti-6Al-4V material changes from a powder to a solid state and then to the Martensite phase in sequence during heating and cooling steps. The numerical analysis during the SLM process was verified by comparing the results of tensile tests with those from the numerical analysis based on the SSPT material properties.

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(2006)홍길동 외 1명심리학41회 피인용

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