Influence of laser power and powder feed rate on the microstructure evolution of laser metal deposited Ti-5553 on forged substrates

Hicks, C. and Konkova, T. and Blackwell, P. (2020) Influence of laser power and powder feed rate on the microstructure evolution of laser metal deposited Ti-5553 on forged substrates. Materials Characterization, 170. 110675. ISSN 1044-5803

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    Abstract

    In this work, titanium blocks of Ti-5Al-5Mo-5V-3Cr (Ti-5553) have been Laser Metal Deposited (LMD) on forged substrate of the same alloy under varying laser power and powder feed rates. The microstructure has been characterized using optical microscopy, scanning electron microscopy and Electron backscatter diffraction (EBSD) techniques. Microstructure was predominantly large columnar β-grains aligned with the build direction interspersed with fine equiaxed β-grains. Increase in the powder feed rate was found to reduce the average β-grain size and promoted clusters of fine grains to be retained during the deposition of subsequent layers. Increase in the laser power also reduced the average β grain size and promoted greater nano-scaled α precipitates at the substrate interface and initial deposited layers which significantly increased the microhardness in this area. Dendrites exist due to micro-segregation of solutes during rapid solidification which create preferential regions for α nucleation. A difference in texture was observed between specimens manufactured with varying laser powers: a low laser power produced a cube texture and a higher laser power produced a <001> // BD fibre texture.

    Creators(s): Hicks, C., Konkova, T. ORCID logoORCID: https://orcid.org/0000-0001-7495-7495 and Blackwell, P. ORCID logoORCID: https://orcid.org/0000-0001-9740-7971;
    Item type:Article
    ID code:74116
    Keywords:laser metal deposition, β-titanium alloy, microstructure, microhardness, texture, electron backscatter diffraction (EBSD), Manufactures, Mechanical engineering and machinery, Mechanics of Materials, Materials Science(all), Mechanical Engineering, Condensed Matter Physics
    Subjects:Technology > Manufactures
    Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Design, Manufacture and Engineering Management
    Strategic Research Themes > Advanced Manufacturing and Materials
    Depositing user: Pure Administrator
    Date deposited:07 Oct 2020 09:18
    Last modified:01 Jan 2021 13:54
    URI:https://strathprints.strath.ac.uk/id/eprint/74116
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