Acoustic Emission Investigation of Rolling/Sliding Contact Fatigue Failure of NiCr–Cr3C2 Coating

• Published in: Journal of thermal spray technology Vol. 25; no. 7; pp. 1365 - 1372
• Main Authors: Guolu, Li, Zhonglin, Xu, Tianshun, Dong, Haidou, Wang, Jinhai, Liu, Jiajie, Kang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-10-2016
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Machines; Manufacturing; Materials Science; Processes; Surfaces and Interfaces; Technical Note; Thin Films; Tribology; C; coating; AE; rolling/sliding contact fatigue; NiCr–Cr; SPS
• ISSN: 1059-9630; 1544-1016
• DOI: 10.1007/s11666-016-0436-2

NiCr–Cr
3
C
2
coating was fabricated using supersonic plasma spraying technology. Subsequently, rolling/sliding contact fatigue (R/SCF) testing was carried out, using acoustic emission (AE) technology to monitor the failure process. The results showed that R/SCF consists of three failure modes, namely abrasion, spalling, and delamination. Abrasion is the main failure mode, but delamination is the most severe. The AE monitoring results indicated that the R/SCF failure process is composed of normal contact, crack initiation, crack propagation, and material removal stages. The frequency of each stage was analyzed by fast Fourier transform, revealing a peak frequency for each stage mainly distributed from 200 to 250 kHz.