| Autor: |
Anthony Dowson, M H Jacobs, Mark Barratt |
| Rok vydání: |
2004 |
| Předmět: |
|
| Zdroj: |
Materials Science and Engineering: A. 383:69-77 |
| ISSN: |
0921-5093 |
| DOI: |
10.1016/j.msea.2004.02.042 |
| Popis: |
Centrifugal spray deposition (CSD) is explored as an alternative route for manufacturing ring-shaped pre-forms for casings in gas turbines. CSD offers metallurgical and economic benefits compared with conventional routes. Research centred on optimising CSD processing to produce nickel alloy rings suitable for thermo-mechanical processing. Alterations to the mass flow-rate and substrate motion produced microstructures characteristic of hot and cold deposits. Hot deposits contained coarse inter-dendritic microstructures and solidification shrinkage. Cold deposits had a banded equiaxed grained microstructure comprising layering, prior droplet boundaries, and inter-splat porosity. Intermediate mass flow-rates created microstructures common to both deposition conditions. Increasing reciprocation speed led to more layering and inter-splat porosity. Slowing reciprocation produced a near optimised microstructure of equiaxed grains, some layering adjacent to the substrate and minimal porosity (≤1.0%). Following thermo-mechanical treatments, tensile properties consistent with commercial specifications were achieved. Improvements in mechanical performance are expected through future process optimisation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect