Study of the mechanical properties of chromonicelevanadium steels with ceramic-metallic (tin-cu) nanostructural coating used in machine building

Abstract

This article examines the study of nanoindentation, scratch testing of a ceramic-metal nanostructured coating  TiN-Cu on melted chromium-nickel-vanadium steels. The nanoindentation method, namely, the analysis of the mechanical response of the TiN-Cu coating surface to the indentation of the atomic force microscope (AFM) nanosensor, is used for direct observation of such phenomena as the appearance of dislocations, the occurrence of shear instability, phase transitions, etc. The mechanisms of destruction of the TiN-Cu coating deposited on substrates in the form of melted new EO5 samples with different copper (7%,14%)   content were studied by the method of scratch testing. It is shown that the destruction of coatings begins with the formation of cracks in the tops of the piles, which are formed along the scratches due to plastic impression of the substrate material. With each increase in the load on the indenter, the nature of the destruction changes.