Effect of energy density on the consolidation mechanism and microstructural evolution of laser cladded functionally-graded composite Ti-Al system

E. O. Olakanmi, M. Sepako, J. Morake, S. Kutua, S. E. Hoosain, S. L. Pityana

Research output: Contribution to conferencePaper

Abstract

The engagement of additive manufacturing (AM) technology in developing intermetallic coatings involves additional heat treatment with a view to obtaining desirable microstructure and mechanical properties. This eventually increases the lead time and the manufacturing cost. To address these challenges, this study explores the fabrication of gradient and laminar structures of titanium aluminide (Ti-Al) composite coatings deposited on Ti-6Al-4V substrate via a single step laser cladding (LC). The alterations in microstructural properties, chemical composition and phase analysis of the coatings reinforced with TiC were investigated as a function of laser energy density. Evaluation of the deposited samples reveals that FGM composite clads were fabricated from Ti-Al blended with TiC when LED was set at 17.50 J/mm2. At the selected LED, a thermo-positive reaction between the constituents' materials was induced and it resulted in the formation of intermetallic compounds (e.g. Ti2AlC, ? and a2 matrix phases) with a microhardness more than that of the substrate (Ti-6Al-4V alloy). This study provides new insights on the selection of process parameters for the coating manufacturers while employing low cost- and time-effective LC process for fabricating functional graded Ti-Al coatings.

Original languageEnglish
Pages1422-1438
Number of pages17
Publication statusPublished - 2020
Event29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018 - Austin, United States
Duration: Aug 13 2018Aug 15 2018

Conference

Conference29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018
CountryUnited States
CityAustin
Period8/13/188/15/18

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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    Olakanmi, E. O., Sepako, M., Morake, J., Kutua, S., Hoosain, S. E., & Pityana, S. L. (2020). Effect of energy density on the consolidation mechanism and microstructural evolution of laser cladded functionally-graded composite Ti-Al system. 1422-1438. Paper presented at 29th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2018, Austin, United States. https://www.semanticscholar.org/paper/Effect-of-energy-density-on-the-consolidation-and-Olakanmi-Sepako/bc08152d6ee7efb0d56448423ad8f3cdda9e9f57