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.
Finite Difference Modeling on the Temperature Field of Substrate in Friction Surfacing
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. As a kind of thermal processing technology, the temperature profile and changes of the substrate in friction surfacing are important factors to get coatings of high quality. In this paper, the temperature field of the substrate during the process is simulated by finite difference method. The results are consistent with experiments, reappearing the temperature change of the substrate during friction surfacing, allowing further study on figuration and quality of coatings.
Friction Welding of Cast Iron and Stainless Steels.
Ductile cast iron (FCD450) and stainless steels (SUS304, SUS430) were friction-welded. Heat content of each joint was measured by calorimetry and tensile test was made.No defect was observed in joints of cast irons. In the present study, a simplified model has been proposed for calculating the heat input rate in dissimilar joints of friction welding using one dimensional thermal conductivity equation. If the burn-off rate is taken into consideration, a correlation between this heat input rate and tensile property of joints examined appeared to exist. In addition, the values obtained by modeling and measured ones were in good agreement.