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한국주조공학회> 한국주조공학회지 (주조)

한국주조공학회지 (주조) update

JOURNAL OF THE KOREAN FOUNDRYMENS SOCIETY

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수록범위 : 1권1호(1981)~38권6호(2018) |수록논문 수 : 2,042
한국주조공학회지 (주조)
38권6호(2018년) 수록논문
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1Al-Si-Cu계 합금의 주조법과 용체화처리 조건이 기계적 특성변화에 미치는 영향

저자 : 문민국 ( Min-kook Moon ) , 김영찬 ( Young-chan Kim ) , 김유미 ( Yu-mi Kim ) , 최세원 ( Se-weon Choi ) , 강창석 ( Chang-seog Kang ) , 홍성길 ( Sung-kil Hong )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 38권 6호 발행 연도 : 2018 페이지 : pp. 111-120 (10 pages)

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In this study, the effects of two different casting methods (gravity casting and, diecasting) and various solid-solution conditions on the mechanical properties of ASC (Al-10.5wt%Si-1.75wt%Cu) and ALDC12 (Al-10.3wt%Si-1.72wt%Cu-0.76wt%Fe-0.28wt% Mn-0.32wt%Mg-0.9wt%Zn) alloys were investigated. A thermodynamic solidification analysis program (PANDAT) was used to predict the liquidus, solidus, and phases of the used alloys. In the results of an XRD analysis, β-AlFeSi peaks were observed only in the ALDC12 alloy regardless of the casting method or SST (solid-solution treatment) conditions. However, according to the results of a FE-SEM observation, both θ(Al2Cu) and β-AlFeSi were found to exist besides α-Al and eutectic Si in the gravity-casted ASC alloy at 500℃ after a SST of 120min. The α-AlFeSi and β-AlFeSi phases including the eutectic phases were also found to exist in the ALDC12 alloy. The results of a microstructural observation and analyses by XRD, FE-SEM and EDS were in good agreement with the PANDAT results. The gravity-casted ALDC12 and ASC specimens showed the highest Y.S. and UTS values after aging for three hours at 180℃ after a SST at 500℃ for 30min. At longer solid-solution treatment times at 500℃ in the gravity-casted ALDC12 and ASC specimens, the elongations of the ASC alloys increased, whereas they decreased slightly in the ALDC12 alloys.

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2재활용 스크랩 함유 Al-Si-Cu계 합금의 주조특성에 미치는 결정립 미세화제와 공정Si 개량화제의 영향

저자 : 성동현 ( Dong-hyun Sung ) , 김헌주 ( Heon-joo Kim )

발행기관 : 한국주조공학회 간행물 : 한국주조공학회지 (주조) 38권 6호 발행 연도 : 2018 페이지 : pp. 121-131 (11 pages)

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The effect of additives on the castability of the AC2BS aluminum alloy, which contains 35% recycled scrap, was investigated. For the wide utilization of the recycled scrap AC2BS aluminum alloy, the research results were compared to those with the AC2B virgin alloy, which is typical Al-Si-Cu alloy system. It was confirmed that the addition of Al-5%Ti-1%B increased the α-Al nucleation temperature during solidification and decreased the grain size through cooling curve and microstructural observations of the recycled alloy. It was also found that an addition of Al-10%Sr decreased the eutectic Si growth temperature during the solidification process and modified the shape of the eutectic Si of the recycled alloy. The characteristics of fluidity, shrinkage and solidification crack strength were evaluated. For the AC2BS aluminum alloy containing 35% recycled scrap, both α-Al grain refinement due to Ti-B and eutectic Si modifications due to Sr contributed to the improvement of the fluidity. The macro- shrinkage ratio increased with additions of both Al-10%Sr and Al-5%Ti-1%B and the micro-shrinkage ratio increased with the addition of Al-10%Sr but decreased with the addition of Al-5%Ti-1%B. The casting characteristics of TiB and Sr-treated AC2BS aluminum alloy containing 35% recycled scrap are similar to those of AC2B virgin alloy. The improvement of the solidification crack strength of the AC2BS aluminum alloy was possible by the reduction of the grain boundary the stress concentration through the enhancement by both ··-Al refinement and eutectic Si modification. More extensive use of the AC2BS aluminum alloy containing 35% recycled scrap can be expected in the future.

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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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순천대학교 부경대학교 부산대학교 한국생산기술연구원 서울과학기술대학교(구 서울산업대학교)
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