1996 Volume 15 Issue 2 Pages 137-145
To investigate the difference in castability between pure titanium and Ti-6Al-4V alloy, three types of casting that differed in mold filling type were constructed.Casting defects were checked by X-ray transparencies and flow behavior was observed using the molten tracer element method.There was no difference between the two metals for F type fillings.However, for thin cavities(W type fillings)and mesh cavities(B type fillings), the castability of the titanium alloy was slightly lower than that of pure titanium.The thermal properties of the titanium alloy are presumed to be considerably different from those of pure titanium since platinum, one of the tracers, was hardly detected during mesh casting of the alloy.Microanalysis of the top of the mesh casting revealed that the molten alloy flow included many particles.In conclusion, the reason for the poorer castability of the titanium alloy is that the viscosity of the molten alloy increased significantly because of the solidification particles included in its flow.
