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H. Yanar, G.Pürçek, D.M. Sekban, S.M. Akterer, “Effect of friction stir processing on tribological performance of low carbon steels”, TURKEYTRIB 2015, 07 - 09 October 2015, 1st International Conference on Tribology, Istanbul, Turkey.
Abstract: Friction stir processing (FSP), a new solid state surface modification technique used for surface hardening through microstructural alteration, was applied to a plain carbon steel (with 0.20%C content) in order to enhance its near surface material properties. FSP transformed the coarse grained microstructure to the fine grained one inside the stir zone, resulting in significant increase in hardness and yield strength without a considerable decrease in ductility. The hardness increased from 140 Hv to about 230 Hv after one pass FSP. Dry friction and wear behavior of the alloy before and after FSP was investigated under different operating parameters using pin-on-disk type tribometer. This improvement in strength and hardness brought about an increase in wear resistance of steel depending on applied pressure. Reduced plasticity of the near-surface material of steel after FSP contributed such improvement in its wear behavior. In this study, metallurgical and mechanical effects on the improvement of wear behavior and any change in wear mechanisms after FSP have been investigated in details.
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