Cyclic strength of hard metals
The fatigue limit of the titanium carbide and tungsten carbide alloys investigated on a basis of 5·108 cycles lies in the range (20–30)·107 Pa, and is thus comparable with the endurance of type ShKh high-carbon (∼1% C-Mn-Si-Cr) ball-bearing steels. The strength and character of fracture of the hard metals are determined by the properties and structural state of their phase constituents. The highest strength is exhibited by tungsten carbide and titanium carbide alloys with evenly distributed equal-sized carbide grains. The character of fracture of the hard metals varies depending on their method of loading, from brittle in static loading to tough-and-brittle in cyclic loading. On time bases not exceeding 106 cycles titanium carbidehard metals are comparable in fatigue resistance to the standard tungsten-containing hard metals.
KeywordsFatigue Titanium Carbide Brittle Tungsten
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