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| Naji, M. |
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Abro, Shahid
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Publications (4/4 displayed)
- 2020Understanding the Effect of Aluminum Addition on the Forming of Second Phase Particles on Grain Growth of Micro-Alloyed Steel
- 2018Effect of Temperature and Time on Nickel Aluminide Coating Deposition
- 2018Influence of Austenite Phase Transformation on Existing Microstructure of Low C-Mn Steel
- 2018Effect of Heating Rate on Microstructural Developments in Cold Heading Quality Steel used for Automotive Applications
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document
Effect of Temperature and Time on Nickel Aluminide Coating Deposition
Abstract
The βNiAl coating was deposited onto Nickel based CMSX-4 superalloy by in-situ CVD (Chemical Vapor Deposition) method. Main focus of this contribution was to study the influence of aluminizing time and temperature on the microstructure and thickness of the coating; this was followed by examination by XRD (X-Ray Diffraction), electron microscope. Results suggest that an incremental variation in temperature alters the coating activities from HA (High Activity) to LA (Low Activity). This is exhibited by the resultant CT (Coating Thickness) since HA coatings are thicker than LA counterparts. The microstructure of the coating formed at low temperature (or HA ones) showed a large amount of α-Cr precipitates while one formed at high temperature (or LA ones) exhibited lower amounts of such precipitates. Moreover, incremental aluminizing time showed linear trend of CT at initial stage, thereafter (10 hrs) it leveled off. Whereas it does not affect microstructure of the coating