Abstract
High-resistant coatings obtained by thermochemical methods are almost always characterized by the presence of such macroscopic defects as voids and inclusions and by quite high levels of residual tensile and compressive macrostresses. We deduce statistical equations aimed at the description of the characteristics of the distribution of density of structural heterogeneities in terms of the density of defects. We establish physical and geometric regularities of the surface damage to thermodiffusion coatings caused in the process of sliding friction. It is shown that structural heterogeneity significantly affects the process of cracking. According to the data of fractographic analysis of the wearing surfaces of coatings, cracks are initiated on macrodefects, propagate to the nearest inclusion or pore, and close there. In coatings with heterogeneous structure, cracking induced by friction is characterized by a certain shape of the cracked cavity with predominance of quadrangle configurations for thermodiffusion layers. We propose a physical model for the analysis of concentration macrostresses in the operating zones of structural macrodefects.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
