Effect of Preheating on the Microstructure Evolution and Mechanical Properties of Electron Beam Welded Ti2AlNb Alloy

The Ti2AlNb alloy is an intermetallic structural material with excellent properties, but it is limited in its uses due to the problem of welding cracks. The electron beam welding (EBW) procedure with preheating on Ti2AlNb alloy was examined in this research using multi-beam processing. The microstructures at the weld center were still constituted of a single B2 phase, and B2 and O phases were in heat affected zone (HAZ), despite the fact that the cooling rate of EBW decreased under electron beam preheating. Under ambient temperature and 650 degrees C high-temperature tensile tests, the tensile strength of Ti2A1Nb alloy joints was respectively above 980 and 595 MPa, as determined by electron beam preheating of 550 degrees C. Welding with preheating increased the mechanical characteristics of Ti2AlNb alloy joints when compared to standard EBW, which was attributable to improved welding joint uniformity.