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오스템퍼드 구상흑연주철품의 기계적 성질에 미치는 잔류오스테나이트량의 영향
최준오(J. O. Choi),이상학(S. H. Lee),최창옥(C. O. Choi),박성택(S. T. Park) 한국열처리공학회 2002 열처리공학회지 Vol.15 No.4
Austempered Ductile Iron (ADI) castings having various chemical composition and heat treatment conditions were investigated. Especially, this study was investigated the influence of various parameters on austempering temperature and alloying elements. The addition of Mo, Cu, and Ni individually or combined in these alloys also investigated. The alloying elements influence the austempering reaction, the microstructures, mechanical properties and amount of retained austenite. In this study, the mechanical properties (ultimate tensile strength(UTS), hardness, elongation) are analysed to show the relationship between alloying elements, austempering temperatures and amount of retained austenite. The amount of retained austenite was the range of 15 - 40%. In case of the alloy to witch Mo, Cu, and Ni was added, the amount of retained austenite was the largest at a constant austempering temperature.
연청동주물의 (鉛靑銅鑄物) 조직에 미치는 용해 및 주입조건의 영향에 관한 연구
이운환,최창옥 ( W . W . Lee,C . O . Choi ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.1
The effects of melting and casting conditions on cast structures of Cu-Sn-Pb alloys were studied. Specimens were prepared at different pouring temperatures of 1100℃ to 1260℃ with use of various kind of molds, green sand mold, CO₂sand mold, shell mold, furan sand mold and metallic mold. (1) The transition of equiaxed to columnar structure greatly influenced by adding elements and mold binders. (2) The change of equiaxed structure according to pouring temperatures were expressed by separation theory. Lower pouring temperature and rapid cooling rate increase hardness and it`s further increase was shown in the region of columnar structure. (3) Proper controls of pouring temperature, cooling rate and mold binder were important factors to improve wear properties of Cu-Sn-Pb alloys castings.