Laser surface alloying of aluminium with WC + Co + NiCr for improved wear resistance

Subhasisa Nath, Jyotsna Dutta Majumdar, Sisa Pityana

    Research output: Contribution to journalArticle

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    Abstract

    In the present study, laser surface alloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 to 3.5 kW and scan speed from 0.012 m/s to 0.04 m/s by simultaneous feeding of precursor powder (at a flow rate of 1 × 10− 5 kg/s) and using He shroud at a gas flow rate of 3 × 10− 6 m3/s. The effect of laser power and scan speed on the characteristics (microstructures, phases and composition) and properties (wear and corrosion resistance) of the surface alloyed layer have been investigated in details. Laser surface alloying leads to development of fine grained aluminium with the dispersion of WC, W2C, Al4C3, Al9Co2, Al3Ni, Cr23C6, and Co6W6C. The microhardness of the alloyed zone is significantly improved to a maximum value of 650 VHN as compared to 22 VHN of the as-received aluminium substrate. The mechanism of microhardness enhancement has been established. The fretting wear behavior of the alloyed zone was evaluated against WC by Ball-on-disc wear testing unit and the mechanism of wear was established.

    Publisher Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Surface and Coatings Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Surface and Coatings Technology, [206, 15, (2012)] DOI: 10.1016/j.surfcoat.2012.01.038

    © 2012, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
    Original languageEnglish
    Pages (from-to)3333-3341
    Number of pages9
    JournalSurface and Coatings Technology
    Volume206
    Issue number15
    DOIs
    Publication statusPublished - 25 Mar 2012

    Fingerprint

    Aluminum
    wear resistance
    Alloying
    alloying
    Wear resistance
    aluminum
    Lasers
    microhardness
    lasers
    coating
    Wear of materials
    flow velocity
    Microhardness
    shrouds
    coatings
    fretting
    editing
    Flow rate
    continuous wave lasers
    quality control

    Keywords

    • Laser surface alloying
    • Aluminium
    • WC
    • Microstructure
    • Microhardness
    • Wear

    Cite this

    Laser surface alloying of aluminium with WC + Co + NiCr for improved wear resistance. / Nath, Subhasisa; Dutta Majumdar, Jyotsna; Pityana, Sisa.

    In: Surface and Coatings Technology, Vol. 206, No. 15, 25.03.2012, p. 3333-3341.

    Research output: Contribution to journalArticle

    Nath, Subhasisa ; Dutta Majumdar, Jyotsna ; Pityana, Sisa. / Laser surface alloying of aluminium with WC + Co + NiCr for improved wear resistance. In: Surface and Coatings Technology. 2012 ; Vol. 206, No. 15. pp. 3333-3341.
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    AB - In the present study, laser surface alloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 to 3.5 kW and scan speed from 0.012 m/s to 0.04 m/s by simultaneous feeding of precursor powder (at a flow rate of 1 × 10− 5 kg/s) and using He shroud at a gas flow rate of 3 × 10− 6 m3/s. The effect of laser power and scan speed on the characteristics (microstructures, phases and composition) and properties (wear and corrosion resistance) of the surface alloyed layer have been investigated in details. Laser surface alloying leads to development of fine grained aluminium with the dispersion of WC, W2C, Al4C3, Al9Co2, Al3Ni, Cr23C6, and Co6W6C. The microhardness of the alloyed zone is significantly improved to a maximum value of 650 VHN as compared to 22 VHN of the as-received aluminium substrate. The mechanism of microhardness enhancement has been established. The fretting wear behavior of the alloyed zone was evaluated against WC by Ball-on-disc wear testing unit and the mechanism of wear was established.Publisher Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Surface and Coatings Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Surface and Coatings Technology, [206, 15, (2012)] DOI: 10.1016/j.surfcoat.2012.01.038© 2012, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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