Bloshchitsyn M. The intensification of the process of laser-powder surfacing using energy plasma stream

In the present dissertation there was determined a mechanism as well as there was proposed for the first time a fundamentally new high-efficiency combined method of laser-plasma deposition with separate functions energy. Here the energy of the plasma is used exclusively for the preparatory stage of transport and heating the powder material. This powder material heats up to the desired temperature (0,8-0,9)Tpl that is determined by the location of the powder in the stream. At the same time laser beam does not lose locality of the process during heating the powder mix-ture by the plasma stream but melts a base material, creating a bath of fusion. The powder that was heated by the plasma stream gets into the fusion which due to tem-perature of the fusion bath and influence of laser radiation is heated to the melting point; by mixing the molten base material and molten material powder it is created a metallurgical connection that let radically improve productivity and quality while re-ducing the cost of the process. The determined basic patterns of changes in the microstructure, the size and na-ture of the distribution of residual stress, adhesion strength, fracture toughness and wear resistance of the surface layers obtained by laser-plasma deposition make possi-ble to predict and improve physical and mechanical properties of surface layers de-posited heavily loaded nodes machine parts.