This study analyzes the effects of different pouring temperatures and mold temperatures on the crack behavior of NaCl–Na₂SO₄ composite water-soluble salt cores (WSSC). Firstly, calculate the solid fraction during the solidification process of the salt core using the Newton baseline method. Then predict the sensitivity of the salt core to thermal cracking using the cracking susceptibility coefficient model. Subsequently, the effects of different pouring temperatures and mold temperatures on the solidification and crack behavior of salt cores were compared. The results showed that when the pouring temperature was 800 °C and the mold temperature was 200 °C, the number of cracks significantly decreased, and the surface quality was the best. Finally, the microstructure and phase composition of WSSC were characterized using scanning electron microscopy. The results of this study indicate that increasing the mold temperature and selecting an appropriate pouring temperature can help improve the density of the salt core structure, reduce susceptibility of cracking, and enhance the surface quality of the salt core.

_{本研究分析了不同浇注温度和模具温度对NaCl-Na 2} SO ₄复合水溶性盐芯(WSSC)裂纹行为的影响。首先，采用牛顿基线法计算盐芯凝固过程中的固体分数。然后利用裂解敏感性系数模型预测盐芯对热裂解的敏感性。随后比较了不同浇注温度和模具温度对盐芯凝固和裂纹行为的影响。结果表明，当浇注温度为800℃、模具温度为200℃时，裂纹数量明显减少，表面质量最好。最后，利用扫描电子显微镜对 WSSC 的微观结构和相组成进行了表征。研究结果表明，提高模具温度和选择合适的浇注温度有助于提高盐芯结构的致密性，降低开裂敏感性，提高盐芯的表面质量。