High temperature oxidation and γ′ depletion in the single-crystal superalloy PWA 1484
| Autor: | Stephen D. Antolovich, Preet M. Singh, Robert L. Amaro, Richard W. Neu |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Work (thermodynamics) Materials science Turbine blade Mechanical Engineering Metallurgy Kinetics Metals and Alloys 02 engineering and technology Rate equation 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention Superalloy Stress (mechanics) Mechanics of Materials law 0103 physical sciences Materials Chemistry Ceramics and Composites Surface roughness Composite material Deformation (engineering) 0210 nano-technology |
| Zdroj: | Materials at High Temperatures. 33:476-488 |
| ISSN: | 1878-6413 0960-3409 |
| Popis: | Single-crystal Ni-base superalloys are a favoured material for blades in the hot section of aero turbines. These materials exhibit excellent dimensional stability, deformation response and oxidation behaviour at higher temperatures, relative to other metals. Due to the high service temperatures and fluctuating loads experienced by turbine blades, a complete understanding of the material’s oxidation and γ′ depletion kinetics is sought to characterise this aspect of the material’s deformation response. This work provides the results and subsequent analysis of stress-free γ′ depletion tests performed on the single-crystal Ni-base superalloy PWA 1484. It was determined that the γ′ depletion kinetics of this material followed a sub-parabolic rate law. Furthermore, γ′ depletion kinetics were dependent upon surface roughness. Surface roughness can be an issue in practical application of oxidation principles and data. A relationship is developed, based on the literature and current work, which relates the stress-... |
| Databáze: | OpenAIRE |
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