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Microstructural Analysis of Nickel-Based Composite Coatings and Their Effect on Micro-hardness and Nano-indentation Behavior

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Computational Methods and Experimental Testing In Mechanical Engineering

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

The coating reliability and failure are inextricably linked to its microstructure, from which all the other characteristics are derived. Based on the properties obtained from multiscale assessments, after a thermal flame spraying processing applied on X18 carbon steel, this investigation aims at expounding the contribution of the prior grit blasting treatment and the presence of the Ni-based bonding layer in determining the coating characteristics. For that, a NiCrBSi self-fluxing alloy reinforced with tungsten carbides was selected to realize the deposits in the open atmosphere, using the acetylene as fuel. The characterization of the coating was carried out through optical microscopy, micro-hardness measurements and nano-indentation tests. Quantitative data were estimated by processing the obtained optical micrographs. The results show that the coating contains fine precipitates and has dendritic microstructure surrounded by a eutectic phase. The micro-hardness profile proved that the prior grit blasting treatment had induced a substrate hardening near the interface where the hardness roughly achieves 500HV. The cooling in the air environment has activated the initiation of cracks. The nano-indentation results reveal that the elastoplastic response of the matrix differs depending on the nature and the proportion of phases.

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Authors and Affiliations

  1. Ecole Nationale Polytechnique, Département de Métallurgie, LSGM, 16200, Algiers, Algeria

    Rabah Azzoug & Fatah Hellal

  2. Centre de Développement des Technologies Avancées, Baba Hassen, Algiers, Algeria

    Yamina Mebdoua

Authors
  1. Rabah Azzoug
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  2. Fatah Hellal
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  3. Yamina Mebdoua
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Corresponding author

Correspondence to Rabah Azzoug .

Editor information

Editors and Affiliations

  1. Laboratory for Advanced Mechanics, University of Science and Technology Houari Boumediene (USTHB), Bab-Ezzouar, Algeria

    Taoufik Boukharouba

  2. Department of Mechanical Engineering, National School of Engineers of Sfax, Sfax, Tunisia

    Fakher Chaari

  3. Laboratory of Materials Science and Process, University of Paris 13, Villetaneuse, France

    Mounir Ben Amar

  4. Laboratory for Advanced Mechanics, University of Science and Technology Houari Boumediene (USTHB), Bab-Ezzouar, Algeria

    Krimo Azouaoui

  5. Department of Mechanical Engineering, University of Science and Technology Houari Boumediene (USTHB), Bab-Ezzouar, Algeria

    Nourdine Ouali

  6. National School of Engineers of Sfax, Sfax, Tunisia

    Mohamed Haddar

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Azzoug, R., Hellal, F., Mebdoua, Y. (2019). Microstructural Analysis of Nickel-Based Composite Coatings and Their Effect on Micro-hardness and Nano-indentation Behavior. In: Boukharouba, T., Chaari, F., Ben Amar, M., Azouaoui, K., Ouali, N., Haddar, M. (eds) Computational Methods and Experimental Testing In Mechanical Engineering. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-11827-3_6

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  • DOI: https://doi.org/10.1007/978-3-030-11827-3_6

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-11826-6

  • Online ISBN: 978-3-030-11827-3

  • eBook Packages: EngineeringEngineering (R0)

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