Fretting Wear Performance of CrN Coating after Laser Shock Peening

作者：Chuangming Ning, Ke Li, Guocan Tang, Yujie Xie, Lunlin Shang, Guangan Zhang, Zhenbing Cai · 发表于：Chinese Journal of Mechanical Engineering · 年份：2025 · DOI：10.1186/s10033-025-01256-0 · 被引用次数：4 · 研究领域：Surface Treatment and Residual Stress、Diamond and Carbon-based Materials Research、Metal and Thin Film Mechanics

Abstract CrN coatings are also employed to protect structural materials in nuclear power plants. It should be noted that the preparation process utilizing physical vapor deposition (PVD) techniques inevitably entails certain defects. Such a phenomenon will affect the protective properties of CrN coatings. In this study, low-energy laser shock peening (LE-LSP) with varying energies was employed for the post-treatment of CrN coatings. The effects of different laser energy LE-LSP treatments on the surface morphology, crystal structure and fretting wear properties of CrN coatings were investigated. The results revealed that the surface of the CrN coatings subjected to LE-LSP underwent significant plastic deformation and displayed a regular texture structure. The surface roughness and Vickers hardness of the CrN coatings exhibit a significant increase. Under a laser energy of 150 mJ, the surface hardness exhibits a maximum increase of 2.35 times. The residual stress of CrN coatings diminishes with the augmentation of laser energy due to the formation of surface cracks. Following LE-LSP treatment, the columnar crystal structure of the CrN coating was disrupted and fragmented into fine grains due to the impact force. As the laser energy augments, the fragmented CrN grains undergo further compaction. During fretting wear, all specimens were in the gross slip regime. The wear mechanism of the CrN coating, 120 and 150 mJ specimens are primarily dominated by abrasive wear, and accompani...