Bespalov S. Structural and morphological wear resistance principles and their implementation in the management of the low alloy steels operability

The thesis is devoted to the development of wear resistance principles, which based on connection regularities of structure formation with tribological contact geometry. These principles by targeted regulation of phase composition of constructural and tool steels by connection of microstructure elements with the contact interaction scheme of solid surfaces was realized and provides high wear resistance. It was revealed that the carbide phase morphology of 40X and 40XHM is one of the main factors affecting the equilibrium roughness, structural-geometric parameters, and the bearing capacity of the contact surface formed upon friction and affect their tribological characteristics. It is shown that obtaining in the structure of X6ВФ, 9XФ and 7ХНМФБ tool steels in the place of large refractory alloyed carbides of disperse martensite with the residues of these carbides contributes to a significant increase in the wear resistance of these steels due to the disappearance of the carbide matrix interfacial boundaries. According to the results of neural network modeling of certified structural-geometric parameters of the surface, depending on its roughness, the bearing capacity of the 40X steel contact surface during friction was analyzed