Authors: B Lang T C Zhang X H Li D L Guo
Publish Date: 2010/06/25
Volume: 45, Issue: 22, Pages: 6218-6224
Abstract
Linear friction welded titanium alloy microstructures were investigated to understand the microstructural evolution in the joints The results show that extrusion of material at the rubbing interface occurred after complete transformation of alpha to beta phase Finer priorbeta grains were obtained in the flash as compared to the parent material due to dynamic recrystallization Metallographic examination revealed that two different structures were existed in the joints ie thermomechanically affected zone developing at the edge of joint and weld appearing in the central portion of joint Although no dynamic recrystallization was observed in the thermomechanically affected zone the phase transformation would occur concurrently with material deformation during welding In contrast dynamic recrystallization had occurred in the weld Effect of welding parameter on the microstructure was investigated by changing amplitude of oscillation 156–203 mm Some defects such as kiss bonding and porosity occurred in the joint at relatively low amplitude of oscillation Therefore relatively high amplitude of oscillation is more preferable for obtaining a fully bonded joint
Keywords: