Failure analysis and optimization of thermo-mechanical process parameters oftitanium alloy fasteners

(in lingua inglese)

Failure analysis of Ti–6Al–4V fasteners was carried out and the failure was attributed to fatigue damage which occurred because socket head hole was pierced into the shank. Metallurgical analysis has confirmed heterogeneity in microstructure, due to uncontrolled process parameters which were followed during fastener manufacturing. An experimental study was conducted to optimize process parameters such that strain rates were optimized as 102 to 103 /s and heating was done in a controlled furnace at 900 8C. Metallurgical analysis with optimum process parameters revealed that there is no evidence of heterogeneity in microstructure.