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박실라,최답천,김관휴 ( Shil La Park,Dap Chun Choi,Kwan Hyu Kim ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.6
N/A The aim of this research is to investigate the effects of gas bubbles on the formation of spheroidal graphite in cast iron, Fe-Si-8%Mg alloy, mischmetal hydride(MmH₂) and CaCO₃, which discharge various amounts of Mg, H₂and CO₂gases, were added to Fe-3.9% C-2.0%Si melt and the melt was innoculated with 0.3wt% of 75%Fe-Si. The spheroidal graphites and/or compacted vermicular graphites were produced with more than 0.625㏄/g of Mg gas or more than 0.3125㏄/g of H₂gas while CO₂gas did not contribute to graphite spheroidization. Nodule counts increased with the amount of Fe-Si-Mg added ; but they decreased with the amount of MmH₂added because the number of effective gas bubbles decrease with the increase in Mm residual. The bull`s eye structure was revealed with 0.625㏄/g, 1.25㏄/g of Mg and 0.3125㏄/g of H₂; the ledeburite structure was revealed with more than 0.625㏄/g of H₂.