Investigation on Microstructure and Fretting Wear Properties of GCr15 Bearing Steel Modified by Fine Particle Bombardment

Abstract

Fretting wear occurring on the roller and raceway of rolling bearings is prone to reduce the reliability of bearings. In this study, fine particle bombardment (FPB) under different air pressures (0.3 and 0.6 MPa) was performed on GCr15 bearing steel, and the microstructure and fretting wear properties of GCr15 bearing steel modified by FPB were systematically investigated. The results show that the surface structure of the samples underwent severe plastic deformation, which led to surface grain refinement and increased in dislocation density. Also, the martensite bundle size decreased, and the densities of low-angle grain boundaries (LAGBs) and high-angle grain boundaries (HAGBs) increased. Moreover, the FPB improved the microhardness and thickness of the deformed layer. The enhancement was positively correlated with the air pressure of FPB. Compared with the untreated sample, the wear volume of the FPB samples increased by 10.1% (0.3 MPa) and 19.0% (0.6 MPa), respectively. Thus, the fretting wear resistance was significantly improved. The main wear mechanism changed from severe adhesive wear, abrasive wear, and fatigue wear to slight adhesive wear owing to the application of FPB.

Keywords:

• Fine particle bombardment
• GCr15
• microstructure
• fretting wear

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.

Data availability statement

Data will be made available on request.

Additional information

Funding

This work was supported by the Key Research and Development Plan of Liaocheng (2021ZD03), Science and Technology SMEs Innovation Capacity Improvement Project of Shandong Province (2022TSGC1364 and 2022TSGC1366), and National Natural Science Foundation of China (no. 52105185).