TY - GEN
T1 - Characterisation of the residual stresses in HVOF WC-CO coatings and substrates
AU - Venter, Andrew M.
AU - Oladijo, O. Philip
AU - Cornish, Lesley A.
AU - Sacks, Natasha
PY - 2014
Y1 - 2014
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=84885994366&partnerID=8YFLogxK
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U2 - 10.4028/www.scientific.net/MSF.768-769.280
DO - 10.4028/www.scientific.net/MSF.768-769.280
M3 - Conference contribution
AN - SCOPUS:84885994366
SN - 9783037858493
VL - 768-769
T3 - Materials Science Forum
SP - 280
EP - 285
BT - International Conference on Residual Stresses 9 (ICRS 9)
T2 - 9th International Conference on Residual Stresses, ICRS 2012
Y2 - 7 October 2012 through 9 October 2012
ER -