Failure analysis of screw propellers and increase of fail safety by surface modification with multicomponent materials with shape memory effect

摘要

Based on the failures analysis of screw propellers we defined quantitative characteristics of the damage. It is shown that most failures are related to the cracks formation and corrosion-erosion lesions. To increase fail safety and prolong product life cycle, we suggested forming a composite surface layer by means of multicomponent materials with shape memory effect (SME) by high-velocity oxy-fuel spraying in a single technological cycle. We supplied the results of stress-strain state (SSS) numerical studies of a screw propeller with nanostructured composite surface layer. Experimental studies of surface-modified samples for fatigue strength, wear resistance, corrosion resistance in seawater confirmed increase in performance characteristics.