Litvinov O. Development of the self-protective powder wire for surfacing the details working in hydro-abrasive deterioration conditions

The dissertation is devoted to a question of improvement of technical characteristics on surfacing process and structure of a powder wire for arc surfacing details from complex alloyed steels, working in hydro-abrasive deterioration conditions.Object of research - engine driven arc surfacing of composit alloys by a powder wire. Subject of research - the characteristics of mass transfer process and alloyed metal during the fusion of the complex alloyed alloys by a self-protective powder wire. Research techniques. The primary goals of activity were decided by computational and experimental methods. The members of the theory of thermal processes, theory of elastic strength and plasticity, methods of mathematical statistics were trusted to in the basis of the mathematical models. With usage of software grounded on numerical solutions, the analytical investigations of local and integral parameters of process in the center of deformation are conducted. The main methods of experimental researches were a technique of an estimation of homogeneity of distribution of hardening fragments and fluoride of graphite in a mixture of components during manufacturing of a blend and distribution of components in a shell by production of powder ribbons; a technique of definition of a factor of splitting of components of the heart depending on value of compression of a powder ribbon; a technique of a state estimation of fragments of components in a structure of the heart of a powder ribbon after it's a manufacturing; a technique of definition of electric resistance between a shell and heart; a technique of definition of parasitic emanatings at a melting of powder ribbons. The complex theoretical and the experimental researches directed on development of methods of calculation, specification of the initial data, the decision optimization problems and, as a results, improvement of technical characteristics on surfacing process and structure of a powder wire for electro arc surfacing details from complex alloyed steels was carriedout.The structure of metal is developed (2,08% C; 2,36% Mn; 1,42% Si; 11,6% Cr; 1,82% V; 2,08% Mo; 0,88% Ti; 4,15% W) for restoration of details from complex alloyed steels, working in hydro-abrasive deterioration conditions, with an optimum combination of wear resistance and adaptability to manufacture. The powder wire with the contents gas and slag forming in amount of 20-25 % in core, providing good welding-technological properties. The developed technological process and powder wire have passed industrial tests in conditions of company "Factory of road machines" (Berdyansk of the Zaporozhye region) and are recommended to use in mechanical engineering for surfacing the details working in hydro-abrasive deterioration conditions.