Deformation of Electron Beam Welded Ti-6Al-4V Alloy Sheet under Superplastic Conditions

摘要

Electron beam welds in Ti-6Al-4V sheet deformed under superplastic conditions were less superplastic and deformed less than the adjacent sheet. This caused severe local thinning of the sheet when the weld direction deviated from the principal strain direction. However, deformation removed weld undercuts and caused acicular weld microstructures to become more like the equiaxed sheet microstructure. The implications for the superplastic forming of components from welded sheet, bar and extrusions are discussed. Great Britain. (JES)