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)
PublisherTrans Tech Publications Ltd
Pages280-285
Number of pages6
ISBN (Print)9783037858493
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)0255-5476
ISSN (Electronic)1662-9752

Other

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

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

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