Effect of Mold Temperature and Pouring Temperature on the Crack Behavior of Composite Water-Soluble Salt Cores

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.