Microstructure features of transformed a induced by β texture in electron beam welded joint of TC25G titanium alloy

The microstructure morphology of transformed alpha is controlled by the crystallographic orientation of its parent beta grain. In the fusion zone of an electron beam welded joint of TC25G titanium alloy, the columnar beta grains exhibited a {001} < 100 > cube texture, in which four kinds of alpha laths with two main growth (trace line) directions formed after post-welded heat treatment. According to the numerical simulation by an orientation-trace method, the trace angle of alpha laths mainly distributed across the ranges of 40 degrees-60 degrees and 120 degrees-140 degrees in the beta matrix with < 001 > fiber texture, thus the microstructure morphology of transformed alpha naturally tended to form cross configurations with two nearly perpendicular alpha laths.