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RISS 인기검색어
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- 저자 : 윤의박 ( Soon Hyoung Cho (검색결과 3 건)
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윤의박,조순형 ( Eui Pak Yoon,Soon Hyoung Cho ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.2
In this paper analytical and numerical methods fur analysis of solidification of castings are described, and the matrix method, one of numerical method, where the nodal point is designated on the element boundary was adapted. The cooling curve obtained by experimental values, when cast steel (0.29%C. 0.62%Si) was poured into CO₂mold, is compared with that of computed values by exploiting computer (V77-600 Data Proceeding System, UNIVAC). The computed value is nearly approximation to the experimental. But the computed value shows a tendency that is a little higher than the experimental in solid-liquid coexisting temperature ranges and much lower than the experimental after solidification. It is considered to result from the lacks and difficulties of ultimately appropriate adaptation of various physical properties and also air cap between castings and mold.
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Single Roller 법에 의한 Al-Cr 계 합금의 급냉응고 조직과 상분해
조순형,윤의박 ( Soon Hyoung Cho,Eui Pak Yoon ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.2
Al-Cr alloy with composition in the range from 1.5wt% to 10wt% Cr were rapidly solidified from the melt by the single roller method. The supersaturated solid solution was obtained up to 6wt% Cr in Al-Cr alloy for 20㎛ thickness. Lattice parameter decreased with increasing Cr content at the rate of 0.00456A perwt% Cr up to 6wt% Cr. Microhardness increased with increasing Cr content at the rate of 10㎏/㎟ per wt% Cr up to 6wt% Cr. Microhardness measurements on the Al-6wt% Cr supersaturated solid solution annealed isothermally showed no sign of age hardening. Decomposition temperature, determined by lattice parameter changes and microhardness changes, was 470℃ for Al-6wt% Cr supersaturated solid solution. Transmission electron microscopy showed that decomposition within one hour below 400℃ occurred at grain boundaries only, and also the additional decomposition within grains being evident at 450℃. The coarse precipitate structure showed at 500℃ and 550℃, respectively. The coarse precipitate structure is considered Al_7Cr.
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급냉응고한 Al-Cr 계 합금의 응고조직에 미치는 응고속도와 두께의 영향
조순형,남태운,윤의박 ( Soon Hyoung Cho,Tae Yoon Nam,Eui Pak Yoon ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.2
The thickness ranges and conditions to form the supersaturated solid solution in Al-Cr alloys were investigated with various rapid solidification conditions. Al-Cr alloys, rapidly solidified by using the small droplet chill quenching method, were examined by means of micro-vickers hardness, lattice parameter, thermal analysis and microscopic observation. The results obtained were as follows; 1. With the increase of solidification rate, the solidified structures were changed to intermetallic compound + solid solution, incompletely supersaturated solid solution, completely supersaturated solid solution, in turn. 2. The minimum solidification rate required to form completely supersaturated solid solution was 2.5×10^(-2)㎝/sec, 3.6×10^(-2)㎝/sec and 6.0×10^(-2)㎝/sec for Al-1.0wt%Cr, Al-1,2wt%Cr and Al-1.5wt%Cr, respectively. 3. The maximum distance from the chill surface required to form completely supersaturated solid solution was 5㎜, 1.3㎜ and 0.3㎜ for Al-1.0wt%Cr, Al-1.2wt%Cr and Al-1.5wt% Cr, respectively.
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