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Laser and GTAW torch processing of Fe-Cr-B coatings on steel : Part II - microstructure and hardness

Idriss, A.N. and Mridha, Shahjahan and Baker, neville (2015) Laser and GTAW torch processing of Fe-Cr-B coatings on steel : Part II - microstructure and hardness. Materials Science and Technology, 31 (3). pp. 355-360. ISSN 0267-0836

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    Abstract

    A comparison has been made of the relationship between microstructure and microhardness developed by surface melting Nanosteel SHS 7170 Fe-Cr-B alloy powder onto a plain carbon steel surface. This powder was initially developed as a high velocity oxy fuel sprayed coating giving a strength ten times that of mild steel, and is particularly suitable for surface protection against wear and corrosion. In this study, the alloy powder was injected into the laser melted surface, while a preplaced powder was melted using the gas tungsten arc welding (GTAW) technique. The laser track consisted of fine dendrites and needle-like microstructures which produced a maximum hardness value of over 800 HV, while the GTAW track produced a mixture of equiaxed and columnar grain microstructures with a maximum hardness value of 670 HV. The lower hardness values are considered to be associated with dilution and grain size.

    Item type:Article
    ID code:47287
    Keywords:coating, steel, Fe-Cr-B powder , laser, GTAW torch, 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:02 Apr 2014 09:11
    Last modified:10 May 2019 13:50
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    URI:https://strathprints.strath.ac.uk/id/eprint/47287
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