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공정 Al-Si 합금의 개량처리와 주단조에 의한 조직변화에 관한 연구
윤지현(Ji Hyun Yoon),설은철(Eun Cheol Seol),박승민(Seung Min Park),이광학(Kwang Hak Lee) 한국주조공학회 2002 한국주조공학회지 Vol.22 No.1
N/A Recently, many studies have been carried out to process on the purpose of lightness in a transport parts because of the saving energy, the environmental problem. The cast-forging process can be expected to lower costs without decreasing the mechanical properties. So, the finest microstructure is needed to get for applying the cast-forging process with Al-Si alloy because the microstructure affects to the cast-forging process. For refinement treatment of eutectic Si and Al solid-solution phase, Sr and TiB were added in Al-Si alloys. The finest microstructure could be observed when 0.075 wt.%Sr and 0.1 wt.%TiB were added respectively. In this case, tensile strength and elongation much more increased than as casting. After high temperature deformation simulation test with grain refinement specimens was carried out, about 70N per unit area(㎟) of specimen was confirmed. After hot forging, tensile strength and elongation were increased. It was considered because casting defect was removed by compressive working.
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아공정 Al-Si 합금의 개량처리와 주단조에 의한 조직변화에 관한 연구
윤지현(Ji Hyun Yoon),설은철(Eun Cheol Seol),이광학(Kwang Hak Lee),김억수(Eok Soo Kim) 한국주조공학회 2002 한국주조공학회지 Vol.22 No.1
N/A For application of cast-forging process with Al-Si alloys, casting experiments are carried out by adding Sr and TiB to Al-Si alloys for grain refinement treatment. We experimented on the mechanical properties according to microstructural changes, forging ability test and also investigated the mechanical properties after forging. The finest microstructure could be observed respectively when 0.05 wt.%Sr and 0.1 wt.%TiB were added. In this case, tensile strength and elongation increased much more than as casting. After high temperature deformation simulation test with grain refinement specimens was carried out, about 60N per unit area(㎟) of specimen was confirmed. After hot forging, tensile strength and elongation were increased. It was considered that casting defect was removed by compressive working.
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공정 Al-Si 합금의 개량처리에 따른 조직관찰 및 기계적 특성에 관한 연구
윤지현,설은철,이광학 울산대학교 2002 공학연구논문집 Vol.33 No.2
주조용 Al 합금(AC4B)을 주단조법에 적용하기 위해 먼저 Sr과 TiB를 첨가하여 주조성 및 단조성이 우수한 주단조 소재를 개발하고 그 기계적 특성을 평가하였다. 먼저, 중력주조시 조대하게 정출하는 침상의 공정 Si를 개량처리하기 위해 공정 Si 개량 화제인 Sr 모합금을 0.025~0.1wt.%로 변화시켜 첨가한 결과 침상의 공정 Si이 미세한 섬유상으로 변화한 것을 관찰할 수 있었으며, 0.075wt.%일 때 가장 우수한 개량화 효과를 나타내었다. 그러나, Sr을 첨가하지 않은 상태에서 균일하게 관찰되던 α-Al상이 Sr 첨가로 인해 조대한 수지상으로 형태가 변화한 것을 관찰할 수 있었다. 따라서, α-Al 고용체상을 미세화하기 위하여 Sr이 0.075w1.% 용해된 알루미늄 합금 용탕에 AlTi_{5}B 모합금을 0.05~0.5wt.%로 변화시키면서 첨가한 결과 α-Al 고용체상이 미세화됨을 관찰할 수 있었으며, 0.1wt.%일 때 가장 우수한 미세화 효과를 나타내었다. 한편, 개량화 및 미세화 처리한 시편의 기계적 특성 평가를 위해 인장시험과 내마모시험을 실시한 결과 인장강도, 신율 및 내마모성이 주방상태에 비해 크게 향상되는 것으로 나타났다. Recently, many studies have been carried out to process on the purpose of lightness in a transport parts because of the saving energy, the environmental problem. The cast-forging process can be expected to lower costs without decreasing the mechanical properties. So, the finest microstructure is needed to get for applying the cast-forging process with Al-Si alloy because the microstructure affects to the cast-forging process. For refinement treatment of eutectic Si and a-Al solid-solution phase, Sr and TiB were added in A-Si alloys. The finest microstructure could be observed when 0.075wt.%Sr and 0.lwt.%TiB were added respectively. In this case, tensile strength and elongation much more increased than as casting.
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