The effect of forging texture and machining parameters on the fatigue performance of titanium alloy disc components

The Mechanisms of fatigue failure in Ti-6Al-2Sn-4Zr-6Mo forged discs are investigated: the effects forging and machining operations on decoupled. A four-point bend testing approach enabled crack initiation propagation characteristics to be studied at multiple locations around disc periphery. Fatigue performance variation (of ~60%) different positions, behaviour were linked heterogeneous crystallographic texture - developed during upstream forging. Downstream processes found increase life, regardless cutting speed. However, circumferential heterogeneity, inherent from stage was still evident even after machining.