Abstract
The effect of strain-path reversal on the kinetics of dynamic spheroidization during subtransus hot working was determined for Ti-6Al-4V with a colony α structure. Isothermal torsion tests were conducted at a temperature of 815 °C and a strain rate of 0.001 s−1; strain-path reversals were achieved by applying forward and reverse torsion sequentially. The kinetics of spheroidization were measured as a function of the local (macroscopic) strain for monotonic-deformation, reversed-torsion, and double-reversed-torsion tests. Strain-path reversal led to a reduction in the spheroidization kinetics compared with monotonic deformation for a given total strain. The slower rate of dynamic spheroidization associated with strain-path reversals was ascribed to a reduced rate of sub-boundary formation/lower sub-boundary energies, which drive the boundary splitting process, and less sharp α/β interface curvatures, which control the coarsening process that also contributes to spheroidization.
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Poths, R.M., Wynne, B.P., Rainforth, W.M. et al. Effect of strain reversal on the dynamic spheroidization of Ti-6Al-4V during hot deformation. Metall Mater Trans A 35, 2993–3001 (2004). https://doi.org/10.1007/s11661-004-0246-x
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DOI: https://doi.org/10.1007/s11661-004-0246-x