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On the Evolution of Microstructure of Gamma Prime + Gamma Platinum Bond Coats Deposited on Ni-Based Superalloys and Their Oxidation Resistance: Role of Superalloy Substrate

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Abstract

The sequence of events leading to the development of γ′ + γ Pt bond coats by diffusing a 10-μm electroplated Pt layer into Ni-based superalloys is elucidated. Most evidence points out that a Pt3Al layer is initially formed at the Pt–superalloy interface during the diffusion heat treatment at 1150 °C. With continued interdiffusion through the Pt3Al layer, the Pt–Pt3Al interface is displaced outward, and the Pt3Al–superalloy interface is displaced inward. This leads to formation of a surface layer of Ni-rich Pt3Al-based γ′-phase, which is eventually transformed into Pt-rich Ni3Al-based γ′-phase leaving behind inner layers depleted in γ′-forming elements and consisting of various mixtures of γ′- and γ-phases. It is shown that the composition of the superalloy particularly the Ti content influences both the thickness and oxidation resistance of the bond coat. Although a higher Ti content promotes a thicker coating, it can have an adverse effect on oxidation resistance.

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Notes

  1. CMSX is a trademark of the Cannon Muskegon Corporation.

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Acknowledgments

The author is grateful for the continued support provided by King Fahd University of Petroleum and Minerals.

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  1. Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, P.O. Box 1639, Dhahran, 31261, Saudi Arabia

    H. M. Tawancy

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Tawancy, H.M. On the Evolution of Microstructure of Gamma Prime + Gamma Platinum Bond Coats Deposited on Ni-Based Superalloys and Their Oxidation Resistance: Role of Superalloy Substrate. Metallogr. Microstruct. Anal. 6, 315–323 (2017). https://doi.org/10.1007/s13632-017-0364-7

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  • DOI: https://doi.org/10.1007/s13632-017-0364-7

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