Accumulated damage process of thermal sprayed coating under rolling contact by acoustic emission technique

Abstract

The accumulated damage process of rolling contact fatigue (RCF) of plasma-sprayed coatings was investigated. The influences of surface roughness, loading condition, and stress cycle frequency on the accumulated damage status of the coatings were discussed. A ball-on-disc machine was employed to conduct RCF experiments. Acoustic emission (AE) technique was introduced to monitor the RCF process of the coatings. AE signal characteristics were investigated to reveal the accumulated damage process. Result showed that the polished coating would resist the asperity contact and remit accumulated damage. The RCF lifetime would then extend. Heavy load would aggravate the accumulated damage status and induce surface fracture. Wear became the main failure mode that reduced the RCF lifetime. Frequent stress cycle would aggravate the accumulated damage status and induce interface fracture. Fatigue then became the main failure mode that also reduced the RCF lifetime.

Key words： accumulated damage; spray coating; rolling contact fatigue; acoustic emission

Acknowledgment

This study was financially supported by the Distinguished Young Scholars of National Natural Science Foundation of China (Grant No. 51125023), the 973 Project (Grant No. 2011CB013405), the National Natural Science Foundation of China (Grant Nos. 51305397 and 51375457), and the Open Foundation of the State Laboratory of Fluid Power Transmission and Control (GZKF-201411) (Grant Nos. 2014C31099 and EM2015042003).

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