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Stress‐dependent fatigue mechanisms of CrC–NiCr coatings in rolling contact
Author(s) -
ZHANG X. C.,
XUAN F. Z.,
XU J. S.,
TU S. T.,
XU B.S.
Publication year - 2011
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2011.01538.x
Subject(s) - materials science , spall , delamination (geology) , composite material , contact mechanics , tribology , stress (linguistics) , coating , weibull distribution , metallurgy , forensic engineering , structural engineering , finite element method , paleontology , linguistics , philosophy , statistics , mathematics , biology , subduction , tectonics , engineering
The rolling contact fatigue (RCF) behaviour of the plasma‐sprayed CrC–NiCr cermet coatings under different tribological conditions of contact stress was investigated. Four sets of fatigue life data of coatings were characterized by Weibull distributions. The failure modes of the coatings were classified on the basis of worn surface observations of the failed coatings. Results showed that the failure mode of the coating was related to the magnitude of contact stress. The RCF life data of the coatings tested at high contact stresses exhibited high scattering, because the bimodal distribution of the fatigue life data was seen in the Weibull plot. Generally, when the contact stress was relatively low, the coatings were prone to fail in spalling and cohesive delamination. However, at high contact stress, the coatings often failed due to interfacial delamination. At different contact stress levels, the maximum shear stress amplitude was the main reason for the generation of spall and delamination.