Abstract
The microstructure evolution and the tensile properties of the second generation single crystal superalloy DD6 were investigated after full heat treatment and aging process at 980~1200℃. The results indicate that the morphological instability occurs at relatively high temperature, and the γ' phase gradually connects and rafts after aged for 800 h at 1050℃. After aged for 100 h at 1200℃, the γ/γ' microstructure cubicity gradually becomes weaker and transforms into spherical boundary, accompanied with a few finer matrix phase embedded into strengthening phases. Whereas the dislocation lines are homogeneously distributed in the γ/γ' interface area, and dislocation motions are also strengthened with increasing of aging time and temperature. After aged at 1050℃ for 1000 h, the precipitation phase in the form of blocky appears in the enrichment areas of solution strengthening elements and its brittle characteristics will pile up dislocation motions at lower temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 1873-1878 |
| Number of pages | 6 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 44 |
| Issue number | 8 |
| State | Published - 1 Aug 2015 |
Keywords
- Dislocation
- Long-term aging
- Microstructure
- Raft
- Tensile property