Effect of Structural Features on Microstructure and Properties Homogeneity Based on Quantification and Statistical Analysis for Large-Scaled Complex Titanium Alloy Castings

In order to facilitate the optimization of the casting process for the large-scaled complex titanium alloy casting (LCTAC), a quantification and statistical analysis method for the LCTAC was developed to elucidate the distribution characteristics of microstructure and mechanical properties throughout the entire casting. The homogeneity coefficient was employed to investigate the relationships between casting structural features and the homogeneity of microstructure-properties. The findings indicate a skewed distribution of grain size in the whole casting, with a notable linear positive correlation between grain size distribution characteristics and wall thickness. Correspondingly, a mere 90% reduction in wall thickness leads to more than a 10% increase in strength or hardness. Furthermore, a comparative analysis revealed that the microstructure homogeneity coefficient for wall thickness exhibited a significant influence of over 50% compared to the homogeneity attributed to wall position, suggesting that wall thickness exerts a more pronounced impact on the homogeneity of LCTAC. Graphical Abstract: (Figure presented.)