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Numerical modelling and microstructural evolution of hybrid Ti-6Al-4V/Ti-Al-Si-Cu composite coating

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Abstract

Additive manufacturing is a commercially competitive manufacturing technique with the possibility of altering the entire perception of design and fabrication. It offers suitable capabilities for the building and repairing applications in the aerospace industry, which usually requires high level of accuracy and customization of parts which usually use materials known to pose difficulties in fabrication such as titanium alloys. The major factors that determine the formation of the dendritic structure are the thermal gradients within the substrate during cooling and the cooling rates. The rapid cooling and input of heat locally during the laser deposition process resulted in metallurgical modifications such as the formation of a complete martensitic structure, a mixture of columnar grains and layer of bands. During the deposition process, the metal solidified, and the developed model enabled predictability of microstructural development and the sizes of the grain growth. The 3D numerical investigation provided clarification and had substantial effects in the prediction of the overall resulting molten pool size and geometry size

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Acknowledgements

The authors wish to acknowledge NRF South Africa-Namibia Joint Science and Technology Research Collaboration NAMG160403161462/105938 for the funding and National Laser Center, CSIR South Africa for the laser equipment.

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Authors and Affiliations

  1. Department of Mechanical Engineering Science, University of Johannesburg, Auckland Park, Johannesburg, South Africa

    Olawale Samuel Fatoba & Lester Caleb Naidoo

  2. College of Aeronautics and Engineering, Kent State University, Kent, OH, USA

    Olawale Samuel Fatoba

  3. Pan African University for Life and Earth Sciences Institute (PAULESI), Ibadan, Nigeria

    Esther Titilayo Akinlabi

  4. Department of Metallurgy and Mining Engineering, University of Namibia, P.O. Box 3624,, Ongwediva, Namibia

    Oluwagbenga Temidayo Johnson

  5. Department of Metallurgy, School of Mining, Metallurgy, and Chemical Engineering, University of Johannesburg, Doornfontein, Johannesburg, South Africa

    Oluwagbenga Temidayo Johnson

  6. Department of Mechanical Engineering, Walter Sisulu University Butterworth Campus, Eastern Cape, South Africa

    Stephen Akinwale Akinlabi

  7. Department of Mechanical Engineering, University of Namibia, Ongwediva, Namibia

    Mutiu Folorunsho Erinosho

Authors
  1. Olawale Samuel Fatoba
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  2. Esther Titilayo Akinlabi
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  3. Oluwagbenga Temidayo Johnson
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  4. Stephen Akinwale Akinlabi
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  5. Lester Caleb Naidoo
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  6. Mutiu Folorunsho Erinosho
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Correspondence to Olawale Samuel Fatoba.

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Fatoba, O.S., Akinlabi, E.T., Johnson, O.T. et al. Numerical modelling and microstructural evolution of hybrid Ti-6Al-4V/Ti-Al-Si-Cu composite coating. Int J Adv Manuf Technol 110, 967–975 (2020). https://doi.org/10.1007/s00170-020-05863-0

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