The technological possibility of fabricating tools by the method of laser surfacing

The possibility of obtaining a layer of a high-hardness composite material on a tool of steel 65G by the method of laser surfacing with R6M5 powder st eel is studied. The use of laser radiation with a power exceeding 1 kW prov ides for creation of a high energy concentration on the surface of the mate rial and control over the temperature gradient in the volume of the tool. T his makes it possible to create coatings with a minimum effect on the compo sition of the substrate in the fusion zone, obtain cast high-speed steels i n which the primary carbides are distributed in the form of individual part icles, and combine the surfacing and the heat treatment of the coating in a single process. The surfacing includes deposition of the powder steel on t he surface of the treated part by means of a special batching crystallizer without any adhesive binder and treatment by a laser beam with a power of a bout 2 kW.