FORMATION OF TiC/STEEL NANO-COMPOSITE SURFACE LAYER ON MILD STEEL USING FRICTION STIR PROCESSING |
Paper ID : 1598-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. FSP parameters such as tool rotation and substrate advancing speeds were adjusted to mix TiC particles with the plasticize matrix. Composite surface layers were formed containing clusters of TiC. Increasing the ratio of tool rotation to substrate advancing speed resulted in break down of TiC clusters. A TiC/steel nano-composite surface layer with uniform dispersion of nano-sized TiC powder was achieved using a tool rotation and substrate advancing speed of 1120 rpm and 31.5mm/s, respectively. The nano-composite surface layer exhibited a micro hardness value about three times more than that of the as-received mild steel; this is attributed to the presence of hard TiC ceramic reinforcements in a matrix of refined acicular-type ferrite. |
Keywords: |
Key words: FSP,Nano-composites,Microstructure,Hardness |
Status : Paper Accepted (Poster Presentation) |