Abstract
Abstract To obtain desired properties, the microstructure of metallic materials is tailored by subjecting them to different thermomechanical processing routes. In manufacturing industries, metallic materials are subjected to different hot deformation processes, viz, rolling, extrusion, and forging, during which materials undergo deformation under complex stress state. Therefore, it is important to understand the effect of deformation mode on microstructure evolution during hot deformation. In the present work, we report systematic studies performed on the influence of deformation mode on dynamic recrystallization behavior of titanium. Titanium specimens were deformed through uniaxial compression (UC) and plane strain compression (PSC) at temperatures of 1,023, 1,073, and 1,123 K, and at strain rates of 0.01–1 s−1 to an equivalent strain of 0.5. Hot deformation experiments were conducted in a Gleeble thermomechanical simulator in an argon atmosphere. The specimens were water quenched immediately after the deformation process to arrest microstructure. To understand the deformation behavior of hot deformed specimens, flow curve analysis was performed. The microstructural characterization was performed through electron backscattered diffraction technique. The dynamic recrystallization (DRX) fraction is temperature and strain rate dependent. Significant difference in DRX fraction between PSC and UC is observed at 1,123 K at a strain rate of 0.1 s−1 and 1 s−1. In both, PSC- and UC-deformed specimens, DRX grains formed preferentially along grain boundaries through grain boundary bulging mechanism.
Published Version
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