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과공정 Al-Si 합금에서의 초정 및 공정 Si 의 동시 미세화
박재영,이재상,나형용 ( Jae Young Park,Jae Sang Lee,Hyung Yong Ra ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.3
N/A It is well known what is impossible to refine primary and eutectic Si simultaneously by addition of both Cu-P and Sr(or Na). Because of the formation of compound Sr₃P₂(or Na₃P) in the melt, in the result, both effects disappear. In this study Al-Cu-P alloy that comprises AlP compounds inside is added in the melt with Sr simultaneously. As AlP compounds that act on nucleation sites of primary Si are not formed but added directly an the melt, it is difficult to form Sr₃P₂by reaction with Sr. Therefore it is possible to refine primary and eutectic Si simultaneously in the general casting process by use of Al-Cu-P alloy and Sr.
기계적합금화법에 의한 과공정 Al-Si 합금 미세화제 개발 및 개량효과에 관한 연구
박재영,이재상,나형용 ( Jae Young Park,Jae Sang Lee,Hyung Yong Ra ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A Recently Al-Cu-P alloys are used to refine primary Si of hypereutectic Al-Si alloys. Because it has inside AlP compound that acts as nucleation site in the melt, Al-Cu-P alloy has good refinement effect in lower holding temperature and after shoter holding times. In this study Al-Cu-P refinement agent was made by mechanical alloying method. When Al-13.5wt%Cu-1.5wt%P was alloyed mechanically for 30hr in Ar atmosphere by high energy ball mill, it had the refinement effect that showed primary Si size of about 30㎛ in Al-20wt%Si at 760℃, treated for 15min.
스트랩캐스팅한 구상흑연주철 박판의 미세조직과 기계적 성질에 관한 연구
최규택(Kyu Taek Choi),박재영(Jae Young Park),나형용(Hyung Yong Ra) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.1
N/A Strip casting process, a new casting technology which makes thin strip of 0.5∼5 ㎜ thickness directly from molten metal, has been dramatically developed for past 10 years and faced commercialization in the case of STS304 strip. In this study, ductile cast iron strip which is 1.1 ㎜ thick and 100 ㎜ wide is manufactured by the twin roll strip caster. Graphite and matrix structure of the strip can be controlled through heat treatments and the mechanical properties are examined. The microstructure of the as-cast strip consists of cementite and pearlite. Especially the equiaxed crystal zone of pearlite exists in the center region of the thickness due to the characteristics of the strip casting process. Matrix structure can be transformed into fully ferrite or ferrite/pearlite mixed structures by the different graphitization heat treatments. The heat-treated strip with ferrite/pearlite matrix structure showed higher hardness and tensile strength than that with full ferrite matrix structure. (Received December 14, 1998)