TI6A41V/)WC-CO( ارزيابي ريز ساختار و خواص مكانيكي جوشهاي اصطكاكي

Evaluation of Microstructure and Mechanical Properties of Ti6A14V/(WC-Co) Friction Welds

The metallurgical and mechanical properties of Ti6AI4V/(WC-Co) friction welds have been investigated The microstructure dose to the bondline comprised a mixture of acicular and equiaxed a plus /I phases. The diffusion of elements in the welded specimens has been detected The fracture strengths of Ti6AI4V/(WC-Co) friction welds markedly improved when the cobalt content in the (WC-Co) carbide substrate increased During the three-point bend testing of TT 6A14V/WC--6 wL %Co welds, the crack initiated at the bondline region at the periphery of the weld and then propagated into the brittle (WC-6 wt. %Co) substrate, while with the T I6AI4V/WGII wt. %Co and T I6AI4V/WC-24 we %Co welds, the crack initiated and propagated at the bondline region.