Abstract
The 700 °C deformation and fracture behavior of tensile samples extracted from both hot-worked and recrystallized Mo-0.5Ti-0. 08Zr-0.025C (TZM) extrudate has been analyzed. The investigation considers the orientation dependence (longitudinal, transverse) of the tensile strain axis to the extrusion axis of the billet and how this dependence effects the strain to failure. The influence of the normal plastic anisotropy parameter, r, and its effect on ductility has been established. The strain-rate sensitivity of each temper has been estimated based on post-uniform elongation behavior. The study has revealed that limited ductility is observed in hot-worked samples tension tested transverse to the extrusion axis of the billet. The combined effects of multiple crack initiation sites, revealed by SEM fractography, and an r-value of 0.49 are thought responsible. The origin of the cracks and the role extrusion plays in deformation anisotropy are discussed. The nearly isotropic deformation behavior of the recrystallized alloy is also investigated.
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