Study on the effects of the shot peening intensity on the microstructure, friction and wear properties of high-strength steel

• Published in: PloS one Vol. 19; no. 12; p. e0314561
• Main Authors: Guan, Huashen, Zhang, Junjie, Zhang, Xiaoguang, Sun, Guofu, Duan, Chenfeng
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 19.12.2024; Public Library of Science (PLoS)
• Subjects: Analysis; Biology and Life Sciences; Compressive properties; Compressive strength; Engineering and Technology; Finite Element Analysis; Finite element method; Friction; Grain refinement; Hardness; High strength steels; Influence; Lasers; Materials Testing; Mechanical properties; Metal fatigue; Microstructure; Particle size; Physical Sciences; Raw materials; Residual stress; Service life; Shot peening; Steel; Steel - chemistry; Steel, High strength; Stress, Mechanical; Structure; Surface hardness; Surface Properties; Topography; Wear resistance; Wear tests; China
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0314561

The microstructure, hardness, residual stress, and friction and wear properties of 25CrNi2MoV steel with different particle diameters during shot peening strengthening were studied. Studies have shown that a grain refinement layer appeared on the surface of the material after shot peening. The shot peening intensity increased with increasing particle diameter; a greater shot peening intensity corresponded to a greater surface hardness of the material, the maximum hardness was 592 HV 0.2 , and the residual compressive stress on the material surface was 725 MPa. A shot peening finite element model was established to accurately predict the residual stresses in the samples after shot peening. The prediction errors were 1.4–7.9%. The finite element model indicates that the maximum residual stress occurs in the subsurface layer. After shot peening, the wear resistance of the sample significantly improved, and the amount of wear significantly decreased. Therefore, shot peening can significantly improve the mechanical properties and wear resistance of high-strength steel, which increases the service life of parts.