Effect of friction stir processing on the tribological performance of steel/TiC nano-composite |
Paper ID : 1596-UFGNSM-FULL |
Authors: |
ahmad ghasemi kahrizsangi1, seyed farshid kashani bozorg *2 1Department of Material Science and Engineering, University of Tehran, North Karegar Street, Tehran, Iran 2: Department of Material Science and Engineering, University of Tehran, North Karegar Street, Tehran, Iran |
Abstract: |
In this study, the almost new processing technique, friction stir processing (FSP) was employed to produce nano-composite surface layers on mild steel. Nano-sized TiC particulates were introduced to the stir zone by means of a pre-made groove. A tungsten carbide tool was used to plasticize the mild steel substrate. The process transformed the original pearlite microstructure to acicular-type ferrite ,resulting in significant increase in surface hardness.This surface hardening produced a significant benefit for friction and wear behavior of the steel as measured by unidirectional sliding pin-on-disk testing.Under sliding,FSP reduced friction coefficient and wear rate and increase wear properties about ten times more than that of the as-received mild steel.The surface nano-composite layer produced by four FSP passes showed superior wear resistance; this is attributed to its greater micro hardness value (due to presence of finer matrix grains and uniform dispersion nano-sized TiC particles). |
Keywords: |
Key words: Metal-matrix nanocomposite,FSP,Tribology,Friction |
Status : Paper Accepted (Poster Presentation) |