Abstract
Welding of annealed plates with thickness 8.5 mm of metastable β Ti-55511 alloys has been carried out through Electron beam Welding (EBW) technique in this research effort. Weldment has been characterized by microscopy, microhardness and tensile test at room temperature with controlled strain rates (i.e. 0.01s-1, 0.001s-1and 0.0001s-1). The Fusion zone (FZ) found is ‘crown shaped’ or ‘hour-glass shaped’. The microstructure of FZ, Heat Affected Zone (HAZ) and Parent Material (PM) consists of long columnar β-grains, coarse equiaxed β-grains and near globular/equiaxed α in transformed β matrix respectively. Lower UTS, lower percentage elongation and lower microhardness are observed in EB weldments as compared to PM (annealed). Minimum 80% weld efficiency has been noticed in welded condition. The fracture surface of PM shows flute as well as fine dimples which confirm the ductile fracture while ‘as-welded’ fracture shows facets and ridges with very fine dimples and micro-pores indicating relatively brittle nature.
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