Abstract
Effect of melt degassing on the hot tearing susceptibility of A206 alloy was examined using the ICTC apparatus. The results of thermal and load analyses, as well as macroscopic examinations, were then used to evaluate predictions of Davies’s criterion, Load Rate criterion and NNC. Load Rate criterion and NNC predicted that degassing increased the hot tearing susceptibility due to increasing the contraction load of the alloy which was consistent with the results of macroscopic investigation of the castings. Davies’s criterion predicted that degassing decreased the hot tearing susceptibility which was in contrast to the other two criteria and the actual observations.
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