The microstructure and mechanical properties of FSPed HSLA steel
Journal Title: Journal of Achievements in Materials and Manufacturing Engineering - Year 2016, Vol 75, Issue 2
Abstract
Purpose: High-strength low-alloy (HSLA) steels have been used in a wide range of applicationsfrom automotive to ship building industry due to their low weight, formability and good weldability.However, especially in the automotive industry, it is still attempted to improve this steel for thebetter formability and strength properties. Grain refinement is a well-known method to improvemechanical properties of metallic materials without changing their chemical compositions. Frictionstir processing (FSP) is a new method of enhancing the properties of metals as a result of grainrefinement by severe plastic deformation, which is based on the basic principles of Friction StirWelding (FSW) technique. The purpose of this study is to investigate microstructural alteration andthe main mechanical properties of HSLA after friction stir processing.Design/methodology/approach: HSLA steel sheet with a thickness of 1.5 mm was processedusing a tungsten carbide (WC) tool consisting of a cylindrical shoulder and a cylindrical conicalpin. The parameters of FSP are kept to a fixed tool rotation speed of 1600 rpm, traverse speedof 170 mm.min-1 and downforce of 5 kN. The evaluation after and before FSPed of HSLA steelwas performed by optical microscope, scanning electron microscope, tensile test and hardnessmeasurement.Findings: After FSP, refined microstructure brought about a considerable increase in bothhardness and strength values. The increase in the yield and tensile strength after FSP was about30% and 34%, respectively.Research limitations/implications: Electron backscatter diffraction (EBSD) mapping couldnot be done in this study. The EBSD mapping should be performed for detailed microstructuralcharacterization of processed zone such as grain size distribution and misorientation angledistribution.Practical implications: FSP can be applied to other steel to obtain high strength steel withoutany decrease in their ductility properties by means of grain boundary strengthening mechanism.Originality/value: FSP, as a severe plastically deformation technique, is applied to manyaluminium alloys and steels. However, only few studies were reported on FSPed HSLA steels.Moreover, further investigations are needed to identify the microstructural and mechanicalproperties of the FSPed HSLA steels.
Authors and Affiliations
S. M. Aktarer, T. Küçükömeroğlu
Keywords
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