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A methodology has been developed for repairing shrouds of turbine blades made of titanium alloy VT41 by creating a wear-resistant coating using a 2-stage technology for obtaining a wear-resistant coating. Based on the results of a numerical calculation of heating with subsequent melting of the coating under the Stefan boundary conditions, the level of the heat flux power density and the time of its action during laser melting of the coating was determined. The distribution of temperature in the coating up to the moment of its fusing to the base is determined. The values of the heat flux for the preservation of the strengthening phase of aluminum oxide in the coating are determined. The prospects of the process of laser cladding of coatings containing particles of aluminum oxide for wear protection of friction surfaces of shrouds of turbine blades made of titanium alloy are confirmed. [ABSTRACT FROM AUTHOR]

A computational technique for creating a wear-resistant coating on shrouds of turbine blades is developed from a heat-resistant alloy by laser cladding of a metal-ceramic coating. On basis of numerical simulation of heating and melting of a two-layer semi-bounded body with Stefan boundary conditions, the values of the heat flux and the time of its action during laser melting of the coating are determined. The distribution of temperature in the coating up to the moment of its fusing to the base is determined. The values of the heat flux for preservation of the strengthening phase of aluminum oxide in the coating are determined. The prospects of laser cladding of coatings containing particles of aluminum oxide for wear protection of friction surfaces of shrouds of turbine blades made of heat-resistant steel are confirmed. [ABSTRACT FROM AUTHOR]