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Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces

Mridha, Shahjahan and Baker, Neville (2015) Overlapping tracks processed by TIG melting TiC preplaced powder on low alloy steel surfaces. Materials Science and Technology, 31 (3). pp. 337-343. ISSN 0267-0836

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Abstract

An overlapping composite track coating was produced on a steel surface by preplacing an 0.5 mm thick layer of TiC powder and then melting using a TIG torch of constant energy input. The influence of the overlapping operation on preheating of the substrate, the dissolution of TiC particulates and the subsequent depth and hardness of the composite layer was analysed. The melt microstructure consisted of both undissolved and partially dissolved TiC particulates, together with a variety of morphologies and sizes of TiC particles precipitated during solidification. Preheating, resulting from the overlapping operation occurred, producing additional melting of the TiC particulates and deeper melt depths but with a reduced volume fraction of TiC precipitates in the subsequent tracks. A maximum hardness of over 800 Hv was developed in the composite layer. The high hardness was unevenly distributed in tracks melted at the initial and final stages, while it varied across the melt depths in other tracks.

Item type: Article
ID code: 47012
Keywords: TIG melting, coating, steel, titanium carbide, overlapping, preheating, microstructure, hardness, Mechanical engineering and machinery, Mining engineering. Metallurgy, Mechanical Engineering, Mechanics of Materials, Metals and Alloys, Surfaces, Coatings and Films
Subjects: Technology > Mechanical engineering and machinery
Technology > Mining engineering. Metallurgy
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Pure Administrator
Date deposited: 28 Feb 2014 12:12
Last modified: 24 Apr 2019 19:51
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URI: https://strathprints.strath.ac.uk/id/eprint/47012
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