The Structure and Interdiffusional Degradation of Aluminide Coatings on Oxide Dispersion Strengthened Alloys PDF Download
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Category :
Languages : en
Pages : 18
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Book Description
A study of the effects of oxide dispersion strengthened {ODS) superalloy composition and coating processing on the structure and diffusional stability of aluminide coatings was undertaken. Increasing substrate aluminum content results in the formation of a more typical nickel base superalloy aluminide coating structure that is more resistant to spallation during high temperature isothermal exposure. The coating application process also affected coating stability, a low aluminum, outward diffusion type resulting in greater apparent stability. A SEM deep etching and fractography examination technique was used in an attempt to establish the location and kinetics of void formation. Alurninide protective lifetimes are still found to be far short of the alloys rnechnital property capabilities.
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Category :
Languages : en
Pages : 18
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Book Description
A study of the effects of oxide dispersion strengthened {ODS) superalloy composition and coating processing on the structure and diffusional stability of aluminide coatings was undertaken. Increasing substrate aluminum content results in the formation of a more typical nickel base superalloy aluminide coating structure that is more resistant to spallation during high temperature isothermal exposure. The coating application process also affected coating stability, a low aluminum, outward diffusion type resulting in greater apparent stability. A SEM deep etching and fractography examination technique was used in an attempt to establish the location and kinetics of void formation. Alurninide protective lifetimes are still found to be far short of the alloys rnechnital property capabilities.
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Category : Power resources
Languages : en
Pages : 868
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Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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Category : Aeronautics
Languages : en
Pages : 28
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Author: Shojiro Ochiai
Publisher: CRC Press
ISBN: 9780824791162
Category : Technology & Engineering
Languages : en
Pages : 832
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Book Description
Provides coverage of dispersion-hardened and fibre-reinforced alloys, addressing principal mechanisms, processing and applications. Mechanical behaviour based on dislocation theory and elastic-plastic mechanics is dealt with and data on advanced composites are provided.
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Category :
Languages : en
Pages : 24
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Category : Mechanical engineering
Languages : en
Pages : 542
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Category : Finishes and finishing
Languages : en
Pages : 486
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Category :
Languages : en
Pages : 5
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A multi-year effort has been focused on optimizing the long-term oxidation performance of ingot-processed (IP) and oxide-dispersion strengthened (ODS) Fe3Al and iron aluminide-based coatings. Based on results from several composition iterations, a Hf-doped alloy (Fe-28Al-2Cr-0.05at.%Hf) has been developed with significantly better high temperature oxidation resistance than other iron aluminides. The scale adhesion is not significantly better; however, the [alpha]-Al2O3 scale grows at a slower rate, approximately a factor of 10 less than undoped iron aluminide. The benefit of Hf is greatest at 1100-1200 C. Long-term oxidation resistance of commercially fabricated ODS Fe3Al has been determined and compared to commercially available ODS FeCrAl. Scale spallation rates for ODS Fe3Al are higher than for ODS FeCrAl. To complement studies of iron-aluminide weld-overlay coatings, carbon steel was coated with Fe-Al-Cr by thermal spraying. These specimens were then exposed in air at 900 and 1000 C and in air-1%SO2 at 800 C. Most likely due to an inadequate aluminum concentration in the coatings, continuous protective Al2O3 could not be maintained and, consequently, the corrosion performance was significantly worse than what is normally observed for Fe3Al.
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Category : Alloys
Languages : en
Pages : 1000
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 932
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