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Influence of Parent Metal Microstructure and Post‐Weld Heat Treatment on Microstructure and Mechanical Properties of Linear Friction Welded Ti‐6Al‐4V Joint

Linear friction welding (LFW) of Ti‐6Al‐4V (Ti‐64) titanium alloy with a different microstructure from the previous study was conducted. The joint microstructure, tensile strength and fracture characteristics were studied. Results show that the microstructure of parent metal has a strong influence on the microstructure and properties of LFW Ti‐64 joints. Under the specific conditions in this study, unexpected spheric α grains were formed near the bondline, which leads to the steep drop of the joint tensile strength. Although the tensile strength could be improved through post‐weld heat treatment, the failure of specimens still took place across the bondline with the cleavage fracture due to the formation of basket‐weave structure at the weld center zone and the remaining of spheric α grains.