Abstract
The mechanism of stray grain formation at the platform of turbine blade simulator and the effect of withdrawal rate (V) on the stray grain phenomenon have been investigated using a macro-scale ProCAST coupled with a 3D Cellular Automaton Finite Element (CAFE) model. The results indicate that the stray grains nucleate at the edges of platform at V =150 μm·s-1 and 200 μm·s-1. Using ProCAST computer simulation software, it was proven that the stray grain formation is significantly dependent on the undercooling and the temperature field distribution in the platform. The macroscopic curvature of the liquidus isotherm becomes markedly concave with an increase in the withdrawal rate. The probability of stray grain formation at the edges of platform can be increased by increasing the withdrawal rate in the range of 70 μm·s-1 to 200 μm·s-1.
| Original language | English |
|---|---|
| Article number | 1672-6421(2015)02-118-05 |
| Pages (from-to) | 118-122 |
| Number of pages | 5 |
| Journal | China Foundry |
| Volume | 12 |
| Issue number | 2 |
| State | Published - 2015 |
Keywords
- Directional Solidification
- Nickel-based single crystal superalloy
- Stray grains
- Undercooling