Characterisation of the residual stresses in HVOF WC-CO coatings and substrates

Andrew M. Venter, O. Philip Oladijo, Lesley A. Cornish, Natasha Sacks

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    Residual strains and stresses associated with the processing steps of the industrial highvelocity oxygen-fuel (HVOF) thermal spray technique, was non-destructively characterised in both the coatings and substrates. A range of substrates, having coefficients of thermal expansion different to that of the as-coated WC-Co material, have been considered to assess the potential role of the thermal misfit associated with the coating procedure. Surface and depth resolved studies of the inplane and normal components of residual strains have been investigated by exploiting the penetrating capabilities of high energy synchrotron X-rays in conjunction with micron sized gauge volumes to enable strain gradient determination with high positional resolution. Results reveal the presence of large residual strain/stress mismatches at the interface region in all the substrate materials, whereas the strains/stresses in the as-coated material are small, seemingly independent of the substrate material. The different contributions due to the HVOF process are qualitatively assessed in terms of an eigenstrains (plastic deformation) approach.

    Original languageEnglish
    Title of host publicationInternational Conference on Residual Stresses 9 (ICRS 9)
    Pages280-285
    Number of pages6
    Volume768-769
    DOIs
    Publication statusPublished - 2014
    Event9th International Conference on Residual Stresses, ICRS 2012 - Garmisch-Partenkirchen, Germany
    Duration: Oct 7 2012Oct 9 2012

    Publication series

    NameMaterials Science Forum
    Volume768-769
    ISSN (Print)02555476

    Other

    Other9th International Conference on Residual Stresses, ICRS 2012
    CountryGermany
    CityGarmisch-Partenkirchen
    Period10/7/1210/9/12

    Fingerprint

    Carbon Monoxide
    residual stress
    Residual stresses
    Oxygen
    coatings
    Coatings
    oxygen
    Substrates
    Coated materials
    plastic deformation
    sprayers
    coating
    thermal expansion
    synchrotrons
    Synchrotrons
    Gages
    Thermal expansion
    Plastic deformation
    gradients
    high resolution

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this

    Venter, A. M., Oladijo, O. P., Cornish, L. A., & Sacks, N. (2014). Characterisation of the residual stresses in HVOF WC-CO coatings and substrates. In International Conference on Residual Stresses 9 (ICRS 9) (Vol. 768-769, pp. 280-285). (Materials Science Forum; Vol. 768-769). https://doi.org/10.4028/www.scientific.net/MSF.768-769.280
    Venter, Andrew M. ; Oladijo, O. Philip ; Cornish, Lesley A. ; Sacks, Natasha. / Characterisation of the residual stresses in HVOF WC-CO coatings and substrates. International Conference on Residual Stresses 9 (ICRS 9). Vol. 768-769 2014. pp. 280-285 (Materials Science Forum).
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    abstract = "Residual strains and stresses associated with the processing steps of the industrial highvelocity oxygen-fuel (HVOF) thermal spray technique, was non-destructively characterised in both the coatings and substrates. A range of substrates, having coefficients of thermal expansion different to that of the as-coated WC-Co material, have been considered to assess the potential role of the thermal misfit associated with the coating procedure. Surface and depth resolved studies of the inplane and normal components of residual strains have been investigated by exploiting the penetrating capabilities of high energy synchrotron X-rays in conjunction with micron sized gauge volumes to enable strain gradient determination with high positional resolution. Results reveal the presence of large residual strain/stress mismatches at the interface region in all the substrate materials, whereas the strains/stresses in the as-coated material are small, seemingly independent of the substrate material. The different contributions due to the HVOF process are qualitatively assessed in terms of an eigenstrains (plastic deformation) approach.",
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    Venter, AM, Oladijo, OP, Cornish, LA & Sacks, N 2014, Characterisation of the residual stresses in HVOF WC-CO coatings and substrates. in International Conference on Residual Stresses 9 (ICRS 9). vol. 768-769, Materials Science Forum, vol. 768-769, pp. 280-285, 9th International Conference on Residual Stresses, ICRS 2012, Garmisch-Partenkirchen, Germany, 10/7/12. https://doi.org/10.4028/www.scientific.net/MSF.768-769.280

    Characterisation of the residual stresses in HVOF WC-CO coatings and substrates. / Venter, Andrew M.; Oladijo, O. Philip; Cornish, Lesley A.; Sacks, Natasha.

    International Conference on Residual Stresses 9 (ICRS 9). Vol. 768-769 2014. p. 280-285 (Materials Science Forum; Vol. 768-769).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    AB - Residual strains and stresses associated with the processing steps of the industrial highvelocity oxygen-fuel (HVOF) thermal spray technique, was non-destructively characterised in both the coatings and substrates. A range of substrates, having coefficients of thermal expansion different to that of the as-coated WC-Co material, have been considered to assess the potential role of the thermal misfit associated with the coating procedure. Surface and depth resolved studies of the inplane and normal components of residual strains have been investigated by exploiting the penetrating capabilities of high energy synchrotron X-rays in conjunction with micron sized gauge volumes to enable strain gradient determination with high positional resolution. Results reveal the presence of large residual strain/stress mismatches at the interface region in all the substrate materials, whereas the strains/stresses in the as-coated material are small, seemingly independent of the substrate material. The different contributions due to the HVOF process are qualitatively assessed in terms of an eigenstrains (plastic deformation) approach.

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    Venter AM, Oladijo OP, Cornish LA, Sacks N. Characterisation of the residual stresses in HVOF WC-CO coatings and substrates. In International Conference on Residual Stresses 9 (ICRS 9). Vol. 768-769. 2014. p. 280-285. (Materials Science Forum). https://doi.org/10.4028/www.scientific.net/MSF.768-769.280