Abstract
Cold treatment techniques are used to enhance the mechanical properties of metal alloys, whose most important characteristics are strength, roughness, and microstructure. The aim of this research is to test the effect of Conventional Shot Peening (CSP) and Severe Shot Peening (SSP) on the mechanical properties of ST37-2 steel. The results of the experiments showed enhancements in surface roughness and tensile strength. However, shot peening decreased the ductility of the metal and caused changes in its microstructure that are indicated in the XRF and XRD tests. Results’ data are provided as an original contribution to the literature while they are compared with the existing data.
Highlights
Surface treatment using cold techniques is widely used to enhance the mechanical properties of metal alloys [1]
The results show a significant increase in roughness between the untreated metal and the Conventional Shot Peening (CSP) cases, while more increase in roughness can be observed in the Severe Shot Peening (SSP) cases
The current research aims to investigate the effects of conventional (CSP) and severe (SSP) shot peening on the mechanical properties of ST37-2 steel through their comparison with untreated specimens, and performing an arc weld as severe plastic deformation (SPD)
Summary
Surface treatment using cold techniques is widely used to enhance the mechanical properties of metal alloys [1]. Shot peening is one of these processes that has an impact on surface roughness, residual stresses, microstructure, and folding of the metal [2]. SPD results into a fine crystalline structure that differs from the crystallographic structure of the original metal or alloy, through forming micrometric and submicrometric subgrains in the coarse grain of the original material [4]. The advantages of SPD on the performance and mechanical properties derive from its ability to achieve deformations in the microstructure through fine grains, which reflects on the performance results of hardness and yield stress to saturation levels [5]. The disadvantages of SPD are embodied mainly in the decreased ductility and decreased metal ability to undergo plastic deformation under stress [6]
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