발간논문

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Vol.39, No.7, 771 ~ 778, 2001
Title
Mechanism of Hot Cracks Formation During Continuous Casting of 36 wt. % Ni-Fe Alloys
김선구Sun Koo Kim , 심상대Sang Dae Shim , 김지준Ji Joon Kim , 김종완Jong Wan Kim , 이용득Yong Deuk Lee , H . Fredriksson
Abstract
Hot cracking formation and its mechanism in invar alloys during continuous casting were investigated. It was found that the solidification range was not related to the hot cracking susceptibility in invar alloys. The hot cracking range (= liquidus temperature - ductile to brittle transition temperature), was found a reliable index for the prediction of hot cracks. Hot cracking susceptibility in invar alloys is greatly affected by cooling rates. With increase in cooling rates from 10 to 100 ℃/min, the ductile to brittle transition temperature shifted significantly to the higher temperature from 1320 to 1390℃ (ΔT=70℃). A hot cracking mechanism for invar alloys has been proposed. Hot cracks formed in fast-cooled alloys occurred between the primary dendrites due to the equiaxed structure. However, hot cracks formed in slow-cooled alloys occurred between the grain boundaries due to the columnar structure.
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