Lazko H. Special feature of structural and ways of increase of properties of the barrier layers on stainless steels, formed by laser alloying

Object of research is processes of gelation in the superficial layers of stainless steels during the laser alloying. A purpose is establishment of features of mechanism of gelation and rational modes of the laser alloying for forming on stainless steels of barrier layers of enhanceable wear resistance. Put in the work of task solved complex on the basis of fundamental positions of alloying theory and phase transformation, utillizing optical and electronic sweepable microscopy; magnetic phase analysis. The thermodynamics prognosis of probability of formation of the second phases in the synthesized layers was carried out after the calculations of isobar-isothermal potentials. Distributing of character of the temperature field after depth of mellting layer was determined as a result of computer design with development and testing of the proper program. Prognostications of descriptions of wear resistance of superficial layers, formed as a result of the laser alloying, carried out of informative design. The rational modes of the laser alloying, which together with the purposeful choice of composition of alloying mixtures allow to form the superficial layers of the set structure and phase composition on the set depth, are set. The features of mechanism of gelation are first set in superficial layers after the laser alloying of stainless steels: is an external layer characterized the cell structure of composite type, and internal - by a structure high-alloy solid solutions, reinforced including of the proper phases the specific amount of which fluently falls after a depth. The results of the research found its application in the improvement for the increase of wear resistance of workings surfaces of metalwares for the Ukrainian enterprises as well as in the educational process of the Lviv Polytechnic National University.