Title: Enhanced hardness and friction behaviour of 40Cr steel by laser surface texturing after ultrasonic surface rolling
Authors: Zhou Yang; Genshang Wu; Jinggan Shao
Addresses: School of Mechanical and Power Engineering, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, 450001, Henan, China ' Henan College of Transportation, Tong Hui Road, Baisha Vocational Education Park, Zhengdong New District, Zhengzhou, 450001, Henan, China ' Henan College of Transportation, Tong Hui Road, Baisha Vocational Education Park, Zhengdong New District, Zhengzhou, 450001, Henan, China
Abstract: This paper constructs a new type of wear-resistant layer on material surface by laser surface texturing and ultrasonic surface rolling. Different from the traditional anti-wear layer, there is no obvious mechanical property difference between the anti-wear layer and material matrix, which can effectively prevent the anti-wear layer falling off and improve fatigue life of material. Meanwhile, the anti-wear layer can also collect wear debris. A hardening layer is formed on the material surface by ultrasonic rolling, and then the surface texturing is machined on the hardening layer by laser. The friction behaviour of anti-wear layer is studied by friction and wears experiment. The experimental results show that the new anti-wear layer has low friction coefficient and surface roughness. The specimen with laser surface texturing (LST) and ultrasonic surface treatment (USR) has more smaller wear depth under the same conditions.
Keywords: laser surface texturing; LST; ultrasonic surface rolling; anti-wear layer; friction coefficient; wear depth.
International Journal of Surface Science and Engineering, 2021 Vol.15 No.3, pp.202 - 220
Received: 15 Dec 2020
Accepted: 20 Feb 2021
Published online: 17 Sep 2021 *