Multi-scale and multi-technic microstructure analysis of a linear friction weld of the metastable-β titanium alloy Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti17) towards a new Post-Weld Heat Treatment

Multi-scale and multi-technic analysis of a linear friction welded metastable-β Ti17 joint in the as-welded (AW) configuration and after a Post-Weld Heat Treatment (PWHT) by annealing (AN) and ageing (AG) using: thermocouples (TC), Optical Microscopy (OM), micro-hardness (Hv), Electron Back-Scatter Diffraction (EBSD) and X-Ray Diffraction (XRD). WL = Welding Line; TMAZ = Thermo-Mechanical Affected Zone (TMAZ); HAZ = Heat Affected Zone; PAZ = WL + TMAZ+HAZ = Process Affected Zone; RX = recrystallization.354