The synergetic effects of shot peening and laser-shot peening on the microstructural evolution and fatigue performance of a medium carbon steel. (January 2023)

• Record Type: Journal Article
• Authors: Zhang, Yating; Zhang, Kun; Hu, Zheng; Chen, Tianyu; Susmel, Luca; Wei, Bingchen
• Is Part Of: International journal of fatigue. Volume 166(2023)
• Publication Date: 2023-01
• Subjects: Shot peening -- Laser shot peening -- Fatigue life transition -- Microstructure -- Short crack; CRS Compressive residual stress -- FCG Fatigue crack growth -- FWHM Full width at half maximum -- PS Possible of survival -- LCF Low cycle fatigue -- HAGB High angle grain boundary -- EBSD Electron backscatter diffraction -- TEM Transmission electron microscope -- XRD X-ray diffraction -- HCF High cycle fatigue -- IPF Inverse pole figure -- SEM Scanning electron microscope; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107246
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: The synergetic effect of shot peening (SP) and laser shot peening (LSP) on the fatigue behavior of 30CrMnSiA steel compared with a baseline SP treatment was investigated. A fatigue life transition was observed in the SN curves, which indicates different fatigue mechanisms and the enhancement of SP and SP + LSP specimens in HCF and LCF. Different microstructural evolutions of SP and SP + LSP spceimens were observed. The short crack incubation and initial propagation were retarded explaining the fatigue life transition behavior. Abstract: The synergetic effect of shot peening (SP) and laser shot peening (LSP) on the fatigue behavior of a medium carbon steel was investigated. A fatigue life transition was observed in the SN curve, where the fatigue performance of the SP + LSP specimen was improved only at lower stress levels. This result is consistent with the short crack propagation behavior observed in the near-threshold region. The heterogeneous structures comprised by ultra-fine grains, dislocation tangles, and more high-angle grain boundaries were responsible for this behavior which effectively retard the short crack propagation.