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.

中文翻译：

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脱气对A206铝合金铸件热撕裂倾向的影响

使用ICTC设备检查了熔体脱气对A206合金热撕裂敏感性的影响。然后，将热分析和载荷分析的结果以及宏观检查结果用于评估Davies准则，载荷率准则和NNC的预测。负荷率标准和NNC预测，由于合金的收缩负荷增加，脱气会增加热撕裂敏感性，这与铸件的宏观研究结果一致。戴维斯准则预测，除气会降低热撕裂敏感性，这与其他两个准则和实际观察结果相反。