Examination of the cyclic strength of structural cermet materials

Abstract

1. The endurance limit of the tested titanium carbide and tungsten carbide alloys at a test base of 5·108 cycles varies in the range 200–30- MPa and its level corresponds to the endurance limit of the high-carbon steels of the ShKh type. 2. The endurance and nature of failure of the hard alloys are determined by the properties and special features of the structure of the individual phase components. The highest endurance was recorded for the alloys based on titanium carbide with the homogeneous and uniform distribution of the carbide grains. 3. The nature of failure of the hard alloys varies depending on the loading mode: from brittle in static loading to ductile in cyclic loading. 4. On the endurance levels not exceeding 106 load cycles, the titanium carbide hard alloys are capable of competing with the standard tungsten-bearing hard alloys.