STUDY OF FATIGUE STRENGTH OF THE TI-10V-2FE-3AL TITANIUM ALLOY WITH TITANIUM CARBIDE PARTICLES

The fatigue strength of rods made of the Ti-10V-2Fe-3Al alloy with different carbon contents (0.031 and 0.063 wt %) under uniaxial cyclic loading was studied. The structure of the alloy with 0.063 wt % C contains titanium carbide particles similar in morphology to those of the primary α phase with an average size of about 2-3 μm. It was experimentally found that the 3 million cycle fatigue strength of the alloy with titanium carbide particles is 1000 MPa. The analysis of fracture surfaces reveals that the specimens experience subsurface fracture near the fatigue strength, and fracture sites are represented by facets where particles of the primary α phase accumulate and initiate cracks. It is experimentally shown and numerically confirmed that the presence of titanium carbide particles in the structure does not affect the fatigue strength of the alloy.