均匀化对钇改性GH3535合金微观组织特征的影响

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

摘要:

研究了均匀化参数对GH3535-0.08wt% Y合金中元素偏析、枝晶组织和析出相演变的影响。此外，在整个实验过程中，特定的均匀化参数保持不变。结果表明，在1150 ℃下加热10 h是最佳的均匀化条件。在这种条件均匀化处理后，枝晶结构和元素偏析被完全消除。铸态合金中存在的SiC和Y₅Si₃相均显著减少。然而，在1188 ℃时进行均匀化会导致合金内部出现过热缺陷；尽管SiC和Y₅Si₃也减少，但观察到一些较大的M₆C相，这会对后续的锻造工艺产生不利影响。

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.