Abstract
The flat plate specimens of nickel-base single crystal superalloy DD6 with different numbers of laser-processed cooling film holes were used to study the low cycle fatigue properties at 900℃. The test data and SEM fracture images were analyzed. The results show that the life of single-hole specimens is ten times of that of the close-spaced holes specimens in the same experimental condition. A number of microcracks are found around the cooling film hole and the destruction of the specimens with cooling film holes is a typical multi-source rupture. The cracks propagate along the {001} planes for single-hole specimens and the middle holes of the close-spaced holes specimens, but the cracks extend along a plurality of slip plane for up and bottom holes of the specimens with close-spaced holes.
| Original language | English |
|---|---|
| Pages (from-to) | 1173-1176 |
| Number of pages | 4 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 44 |
| Issue number | 5 |
| State | Published - 1 May 2015 |
Keywords
- Low cycle fatigue
- Modeling specimen
- Nickel-base single crystal superalloy