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Open AccessArticle

Effect of Centrifugal Shot Peening on the Surface Properties of Laser-Cut C45 Steel Parts

Department of Production Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, 36 Nadbystrzycka Street, 20-618 Lublin, Poland
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Materials 2019, 12(21), 3635; https://doi.org/10.3390/ma12213635
Received: 5 October 2019 / Revised: 29 October 2019 / Accepted: 4 November 2019 / Published: 5 November 2019
(This article belongs to the Section Carbon Materials)
This article presents the results of experimental studies of the impact of centrifugal shot peening parameters on the roughness, microstructure, and microhardness of the surface layer of laser-cut C45 steel parts. Residual stress distributions and the presence of iron oxides on the surface of these elements were also examined. Centrifugal shot peening tests were performed on an FV-580a vertical machining center while using a specially designed peening head. The parameters that were varied during centrifugal shot peening included tangential speed of the tool vg and feed rate vf. The use of centrifugal shot peening for finish machining of laser-cut C45 steel parts allowed for obtaining a four-fold reduction in the surface roughness parameters Ra and Rz. As a result of shot peening, the geometrical structure of the surface of the steel parts was modified and it acquired new beneficial features, such as large values of the rounding radii of the micropeaks and high material ratios (Rmrmax = 92%). At the same time, the surface layer was hardened (microhardness increased by 16%) and a compressive residual stress layer was produced on the surface of the workpieces. Additionally, as the shot impacted the processed surface, combustion products were “blasted” or “sheared” off it. Shot peening using the proposed technique can be successfully performed while using CNC machines. View Full-Text
Keywords: laser cutting; centrifugal shot peening; surface roughness; microstructure; microhardness; residual stress laser cutting; centrifugal shot peening; surface roughness; microstructure; microhardness; residual stress
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Skoczylas, A.; Zaleski, K. Effect of Centrifugal Shot Peening on the Surface Properties of Laser-Cut C45 Steel Parts. Materials 2019, 12, 3635.

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