Abstract
The influence of Re and Ru on segregation and microstructure evolution during heat treatment has been investigated in four Ni-based single-crystal superalloys with varied contents of Re (3%-6%, mass fractions) and Ru (0% and 3%). The additions of Re and Ru lead to the more severe segregation of alloying elements in as-cast structures. However, the effects of Ru on as-cast segregation can be neglected after the stepwise solution heat treatments. The additions of Re and Ru lead to the lower γ'-coarsening rate, more cuboidal γ'-morphology and reduced γ'-size. Electron microprobe analysis (EPMA) indicates that Al, Ta and Ni partition to the γ'-precipitates, whereas Re and Cr strongly partition to the γ-matrix. In comparison to Re and Cr, Ru and W show the less tendency to partition to the γ-matrix. Additionally, Re increases the supersaturation of Re, Cr, Co and W in the γ-matrix, whereas Ru only slightly suppresses the partition of these TCP-forming elements to the γ-matrix.
| Original language | English |
|---|---|
| Pages (from-to) | 845-852 |
| Number of pages | 8 |
| Journal | Jinshu Xuebao/Acta Metallurgica Sinica |
| Volume | 48 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2012 |
Keywords
- Microstructure
- Re
- Ru
- Segregation
- Single-crystal superalloy
- γ'-morphology
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