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The Effect of Mold Density and Evacuation on Surface Defect in Lost Form Casting of High Chromium Cast Irons  

Lee, Kue-Hee (Dept.of Metallurgical & Materials Engineering, yeungnam University)
Yoo, Kook-Jong (Dept.of Metallurgical & Materials Engineering, yeungnam University)
Baek, Eung-Ryul (Dept.of Metallurgical & Materials Engineering, yeungnam University)
Choi, Hyun-Jin (Korea Institute of Industrial Technology)
Lee, Kyung-Whoan (Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.22, no.6, 2002 , pp. 309-314 More about this Journal
Abstract
The effect of mold density and evacuation on surface defect of high chromium cast iron upon EPC process was investigated. Under evacuation of $0.1{\sim}0.3$ atm, surface defects were carbon defect, burn on and misrun. Carbon defect was augmented by increasing mold density from 0.011 g/$cm^3$ to 0.03 g/$cm^3$ under evacuation of $0.1{\sim}0.3$ atm, but carbon defect was decreased by increasing evacuation from 0.1 to 0.3 atm. Burn-on wasn't found under evacuation of 0.1 atm regardless of mold density, but burn-on was augmented by increasing evacuation from 0.2 to 0.3 atm and decreased by reducing mold density. Misrun was only found under 0.1 atm evacuation and 0.011 g/$cm^3$ mold density.
Keywords
EPC process; high chromium cast Iron; surface defect; mold density; evaluation; carbon defect; Burn-on; Misrun;
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  • Reference
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