Fatigue failure mechanisms of plasma-sprayed CrC-NiCr cermet coatings in rolling contact
The aim of the present study was to address the fatigue behavior and failure modes of a series of plasma-sprayed CrC-NiCr cermet coatings in rolling contact under the same tribological condition at room temperature. The Weibull distribution plot of fatigue lives of the coated specimens was obtained. The failure modes and mechanisms of the coatings were studied on the basis of the worn surface observations of the failed coatings. Experiment results the RCF life data of the coatings exhibited higher scattering, since the bimodal distribution of the fatigue life data of the coatings was observed in the Weibull plot. Different failure modes, i. e., spalling and delamination, were observed during this investigation. However, the failure modes might be associated with the magnitude of contact stress, the microstructure of the coatings, the depth of the orthogonal shear stress and/or the maximum shear stress, and the bonding strength of the coatings. The coatings failed in the spalling type of failure generally exhibited the relatively high fatigue lives and the coatings failed in the interfacial delamination type of failure exhibited the low lives, resulting in the bimodal distribution of the fatigue life data in the Weibull plot.
Rolling contact fatigue CrC-NiCr cermet coating Plasma spraying Weibull distribution Failure mechanisms
Xiancheng Zhang Binshi Xu Fu-Zhen Xuan
National Key Lab. of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, China S National Key Lab. for Remanufacturing, Beijing 100072, China School of Mechanical and Power Engineering, East China University of Science and Technology, Shangha
国际会议
国际断裂力学2007年会(Fracture Mechanics and Applications 2007)
长沙
英文
69-78
2007-11-01（万方平台首次上网日期，不代表论文的发表时间）