Abstract
The influence of substituting Mo for W on solidification characteristics of Re-containing single crystal superalloy was investigated via experimental analysis and thermodynamic calculation. W-rich single crystal superalloy (Alloy W) and Mo-rich single crystal superalloy (Alloy Mo) both had typical dendritic microstructure, while interdendritic precipitations of Alloy W and Alloy Mo were γ′ phase+γ/γ′ eutectic phases and γ′ phase+NiMo phase, respectively. Meanwhile, W significantly segregated to dendritic region in Alloy W, while Mo segregated to interdendritic region in Alloy Mo. Moreover, substituting Mo for W obviously decreased the microsegregation degree of Re and Al elements. The influence of substituting Mo for W on microsegregation behavior of alloying elements (e.g. Re) effectively decreased the tendency of forming freckle during solidification. Furthermore, substituting Mo for W decreased liquidus temperature and solidus temperature of single crystal superalloy.
| Original language | English |
|---|---|
| Pages (from-to) | 85-92 |
| Number of pages | 8 |
| Journal | Journal of Alloys and Compounds |
| Volume | 754 |
| DOIs | |
| State | Published - 25 Jul 2018 |
Keywords
- Microsegregation behavior
- Microstructure
- Ni based single crystal superalloy
- Solidification characteristic temperatures
- Substituting Mo for W
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