Influence of Heat Transfer Coefficient on Crystallization and Defect Formation in EN-GJL-200 Gray Cast Iron Castings During Molding in GS-MM

The article investigates the influence of the heat transfer coefficient on the casting process of EN-GJL-200 gray cast iron into a Green Sand - Machine Molded (GS-MM) sand-clay mold using ProCAST software. The relevance of the study is driven by the need to improve the quality of cast iron castings and to reduce the probability of defect formation in foundry production. The aim of the work is to determine the optimal heat transfer coefficient value that allows minimizing the risk of rejects and improving crystallization, heat removal, and cooling rate parameters for gray cast iron castings. The study was conducted using computer simulation at various heat transfer coefficient values (h = 200, 2000, 4000, 8000, and 10000 W/(m2·°C)) with an analysis of the graphs of cooling rate, temperature, solid phase fraction, and the Niyama criterion. It was established that increasing the heat transfer coefficient accelerates the cooling and solidification of EN-GJL-200 castings and reduces the probability of defect formation. The optimal range of the heat transfer coefficient for obtaining high-quality cast iron castings is from 4000 to 8000 W/(m2·°C). The obtained results confirm the effectiveness of using ProCAST for improving the technological processes of gray cast iron casting.

Hali tarjima qilinmagan