Influence of Homogenization on Microstructure Character-istics of Yttrium-Modified GH3535 Alloy

Abstract:

The influence of homogenization parameters on element segregation, dendritic structure, and the precipitate evolution in the GH3535-0.08wt% Y alloy was investigated. Additionally, some specific homogenization parameters were maintained constant throughout the experiments. Results indicate that the heat treatment at 1150 °C for 10 h is the optimal homogenization condition. Following this optimal treatment, dendrite structures and element segregation are eliminated. Furthermore, both SiC and Y₅Si₃ precipitates in the as-cast alloy decrease significantly. Conversely, the homogenization at 1188 °C induces overheating defects within the alloy. Although SiC and Y₅Si₃ phases also decrease, some large M₆C phases can still be observed, adversely affecting subsequent forging processes.