On the thermo-mechanical events during friction surfacing of high speed steels
This paper is concerned with the friction surfacing of high-speed steels, BM2, BT15 and ASP30 onto plain carbon steel plate. The events that the matrix and carbides experience as the coating material pass from the coating rod to the substrate, in forming the coating, is described. The coating is observed to harden automatically within a few seconds of being deposited onto the cold substrate. This autohardening is observed to be an inherent feature of the friction surfacing process and the only post-coating heat treatment required is tempering, as with traditionally hardened high-speed steels. The mechanism of autohardening is discussed in terms of the mechtrode/coating/substrate thermal system.
Investigation on the wear and corrosion behaviour of friction surfaced mild steel
It is one of the methods used by friction surfacing in mild steel where wear resistance and corrosion resistance improved. This work is done by using end milling machine. Hardness, wear and corrosion resistance were conducted by the corresponding ASTM standard and results were compared with the base metals. Enhancement in mechanical properties were found with the new specimen and the friction surfacing was found to be the suitable process that can improve the mechanical properties like hardness, wear and corrosion.
Deposition of Hard Coating Layer by Friction Surfacing.
Although there have been proposed and applied several surfacing technologies, no appropriate process was appeared to coat 1 mm thickness layer on substrate. This paper deals with the fundamental approach to establish friction surfacing as a technique to coat a hard layer -1 mm thick.Experiments clarify the effect of operating parameters on surface quality using conventional friction welding machine equipped sliding stage. Material was selected a martensitic stainless steel with 1C-17Cr as a coated material, and a low carbon structural steel as a substrate.A stable hardened coated layer was obtained with dimensions of 20 mm width and 1 mm thickness. No dilution was observed in this process. Hardness values reached around 500 to 600 Hv in as-coated condition. Dimensions of coated layer are depended on friction speed (rotating speed) of coated material, and lower friction speed can make thicker and wider coatings. Deposition speed is slightly less than those of conventional arc welding processes under the conditions of this experiment.