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Vol.25, No.11, 798 ~ 808, 1987
Title
A Study of the Effects of δ- ferrite on Crack Propagation in Cast Duplex Stainless Steel
이경섭Kyung Sub Lee, 이호종Ho Jong Lee
Abstract
The effects of δ-ferrite on crack propagation were studied on CF-type cast duplex stainless steel at room temperature under constant load and under alternating load. The crack propagation rate of CF-8 decreased as the amount of δ-ferrite increased. The crack propagation rate of CF-3 with 9.3% δ-ferrite was lower than that of CF-8 with 7.7% δ-ferrite, but higher than that of 8% δ-ferrite. In case of CF-8 with 12% δ-ferrite. the role of δ-ferrite as a crack arrester in non-heat-treated material was small compared to that in heat-treated one. Wrought 304 stainless steel had a slower crack propagation rate than CF-8 with 0% δ-ferrite.
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