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    EFFECT OF SEVERE PLASTIC DEFORMATION ON MECHANICAL PROPERTIES OF WELDED ST37-2 STEEL
    (2020-12-18) Sahhal, Abubaker H. Almabruk
    Cold treatment techniques are used to enhance the mechanical properties of metal alloys, while the most important characteristics are strength, roughness and microstructure. Severe plastic deformation (SPD) is formed in metals through processes, such as hydrostatic extrusion, which performs deformations in the metal at low temperatures, in comparison with other techniques. SPD results into a fine crystalline structure, that differs from the crystallographic structure of the original metal or alloy, through forming micrometric and submicrometric sub-grains in the coarse grain of the original material. SPD comes with different advantages and disadvantages that are related to the mechanical properties and performance of the material. ST37-2 is a low carbon mild steel that is mostly used as a structural metal due to several performance criteria it possesses. The alloy has excellent weldability and good ductility, which qualified it to be used in many applications, including shelters and water vessels, and can be shaped for several purposes as angles, strips, sheets, and plates. ST37-2 is non-alloy in its standard form processed through hot rolling. The aim of the 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 experiment 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. Data are provided for ST37-2 steel, as an original contribution to the literature, while comparing results with existing data. The tensile strength values indicate enhancements in yield strength and ultimate tensile strength values reaching up to 19.7% and 22.8% with CSP and SSP, respectively, while elongation decreased up to 27.2%, confirming the decrease in ductility with shot peening. Hardness of the alloy increased in treated samples, as well as changes in microstructure are indicated through XRF and XRD analyses. Deformation intensities are increased, as investigated through optical microscopy, while the layer thickness increase in the SSP case, in comparison with the CSP case, is observed in the FESEM study.