Abstract
Abstract Addition of boron to cast Ti–6Al–4V alloy leads to significant refinement in grain size, which in turn improves processibilty as well as the mechanical properties of the as-cast alloy. Room temperature tensile and fatigue properties of Wrought Ti–6Al–4V–B alloys with B up to 0.09 wt.% are investigated. Thermo-mechanical processing at 950 °C caused kinking of α lamellae and alignment of TiB particles in the flow direction with a negligible change in prior β grain and colony sizes, indicating the absence of dynamic recrystallisation during forging. Characterisation with the aid of X-ray and electron back scattered diffraction reveal a strong basal texture in B free alloy which gets randomised with the 0.09B addition in the forged condition. Marginal enhancement in tensile and fatigue properties upon forging is noted. B free wrought Ti–6Al–4V alloy exhibits better tensile strength as compared to B containing alloy, due to the operation of 〈 c + a 〉 slip on pyramidal planes with high value of CRSS as compared to 〈 a 〉 slip on basal and prismatic planes. Decrease in fatigue strength of Ti–6Al–4V–0.04B in as-cast and the wrought state is observed due to increase in the volume fraction of grain boundary α phase with B addition, which acts as a crack nucleation site. No significant effect of TiB particles on tensile and fatigue properties is observed.
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