Abstract
The experiments of friction coating under water were carried out in a water bath. A quench hardenable martensitic stainless steel with 1%C-17%Cr was utilized as a coating material and low carbon structural steel as a substrate, using a vertical friction welding machine with a traverse sliding stage.
The results showed that the uniform hardness distribution across the transverse section of coatings with refined microstructures had been achieved. The deposition efficiencies of consumable material under water condition were greater than those obtained in air owing to the cooling effect of water. The quenching crack defect had not been observed due to the unique process of friction coating, in which the cooling rate of deposited metals can be adjusted by combination of process parameters.
Meanwhile, an attempt had been made to deposit aluminum alloy consumable metals, using the process of underwater friction coating to restrain the formation of upset roll. The sound bonding coatings with substrate had been obtained in a stabilized coating process.
