Influences of W and Al on the Microstructure and Stress-Rupture Property of Re-Free Ni-Based Single Crystal Superalloys
| Autor: | Cheng Bo Xiao, Qing Li, Ming Jun Zhang, Xin Tang, Jing Yang Chen |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Alloy Analytical chemistry chemistry.chemical_element 02 engineering and technology Liquidus Solidus Tungsten engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Superalloy chemistry Mechanics of Materials 0103 physical sciences Volume fraction engineering General Materials Science 0210 nano-technology Single crystal |
| Zdroj: | Materials Science Forum. 898:492-497 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.898.492 |
| Popis: | The influence of W and Al on the solidus and liquidus temperatures, microstructure and stress-rupture property at 980 °C/250 MPa was investigated in three Re-free experimental Ni-based single crystal superalloys. The results indicated that the solidus temperature increased for 14.0 °C and 9.8 °C by adding 0.84 wt.% W only and adding 0.45 wt.% Al and 0.44 wt.% W to the base alloy, respectively. The γ′ morphology changed from nearly cuboidal in the base alloy to cuboidal by adding 0.45 wt.% Al and 0.44 wt.% W. The volume fraction of γ′ precipitates increased, while the γ channel width decreased after adding Al and W. The additions of Al and W improved the stress-rupture life at 980 °C/250 MPa because of higher γ′ volume fraction, narrower γ matrix channel and more complete rafting structure. |
| Databáze: | OpenAIRE |
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