Abstract
The incipient melting process of a B bearing third generation single crystal superalloy was investigated by Thermol-Calc software. The simulation data was obtained by EPMA. The results show that the incipient melting phase is M2B and the incipient melting temperature is 1265℃, which is significantly lower than the melting temperature of eutectic (1352℃) obtained by DSC. The dissolution of γ/γ' eutectics was studied by SEM. It is indicated that more time and higher temperature are necessary to dissolve the coarse γ' in eutectics than mosaic-like eutectics and fan-like eutectics. The eutectics shape of the incipient melting region is round. Homogenous nucleation could be found in incipient melting region due to the fast cooling rate of air cooling. The resolidification structure owns mosaic-like eutectics and fan-like eutectics which are dissolved in the early stage of solution heat treatment.
| Original language | English |
|---|---|
| Pages (from-to) | 3105-3110 |
| Number of pages | 6 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 46 |
| Issue number | 10 |
| State | Published - 1 Oct 2017 |
Keywords
- Eutectic
- Incipient melting
- Solution heat treatment
- Superalloy