Microstructure, mechanical properties and post‐weld heat treatments of dissimilar laser‐welded Ti 2 AlNb/Ti60 sheet

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Abstract
Dissimilar joining of Ti 2 AlNb and Ti60 rolled sheet was performed by laser beam welding. The microstructures and mechanical properties of as‐welded and post‐weld heat‐treated Ti 2 AlNb/Ti60 joints were investigated by microstructure observation and mechanical properties testing. The fusion zone (FZ) of the as‐welded joint consisted of B 2 /β matrix and small S 2 balls. The heat‐affected zones HAZ‐Ti 2 AlNb and HAZ‐Ti60 for the as‐welded joint were characterized as α 2 + B 2 /β + O and α′ + α + β + S 2 , respectively. The tensile strength and elongation of as‐welded sheet were 597.5 MPa and 6.2% at 650 °C, respectively. Most of the plastic deformation was taken place at the side of Ti60 alloy. With the increase in the heat treatment temperature, the anchoring strength between each other of B 2 /β grains was enhanced by the precipitated lamellar α′ and O grains at the FZ. The depth of the fracture dimples increased with the heat treat temperature increasing. The heat‐treated welding joint at 970 °C presented a good balance of the tensile strength and plasticity, where the tensile strength and the elongation were enhanced to 669.7 MPa and 7.1% at 650 °C, respectively.
Funding Information
  • program of Changjiang Scholars and Innovative Research Team in University (NO.IR1229)
  • MatProFuture in Marie Curie Actions of the European Commission Seventh Framework Programme (No. FP7-PEOPLE-2012-IRSES-318968)

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