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Mechanical Property of HVOF Inconel 718 Coating for Aeronautic Repair

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Abstract

The module of elasticity is one of the most important mechanical properties defining the strength of a material which is a prerequisite to design a component from its early stage of conception to its field of application. When a material is to be thermally sprayed, mechanical properties of the deposited layers differ from the bulk material, mainly due to the anisotropy of the highly textured coating microstructure. The mechanical response of the deposited layers significantly influences the overall performance of the coated component. It is, therefore, of importance to evaluate the effective module of elasticity of the coating. Conventional experimental methods such as microindentation, nanoindentation and four-point bending tests have been investigated and their results vary significantly, mainly due to inhomogeneous characteristics of the coating microstructure. Synchrotron radiation coupled with a tensile test rig has been proposed as an alternative method to determine the coating anisotropic elastic behavior dependence on crystallographic orientations. The investigation was performed on Inconel 718 (IN718) HVOF coatings sprayed on IN718 substrates. Combining these experimental techniques yield a deeper understanding of the nature of the HVOF coating Young’s modulus and thus a tool for Design Practice for repair applications.

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Acknowledgments

The authors acknowledge the financial support of the VINNOVA (Swedish Governmental Agency for Innovation Systems) funded NFFP5 project and the technical supports from the Thermal Spray Department of GKN Aerospace (Trollhättan, Sweden). A. Manescu and both local contacts T. Pirling at the Institute Laue-langevin (ILL) and C.C. Curfs at the European Synchrotron Radiation Facility (ESRF) respectively, are gratefully acknowledged for their technical supports in performing synchrotron experiments. Last but not least, special thanks are addressed to J. Nohava from CSM-Instrument (Switzerland) for the nanoindentation experiments.

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  1. Production & Engineering Science, University West, Trollhättan, Sweden

    Christophe Lyphout, Angelica Fasth & Per Nylen

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  1. Christophe Lyphout
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  2. Angelica Fasth
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  3. Per Nylen
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Correspondence to Christophe Lyphout.

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Lyphout, C., Fasth, A. & Nylen, P. Mechanical Property of HVOF Inconel 718 Coating for Aeronautic Repair. J Therm Spray Tech 23, 380–388 (2014). https://doi.org/10.1007/s11666-013-0007-8

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  • DOI: https://doi.org/10.1007/s11666-013-0007-8

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