Investigation of flow stress and microstructure development in non-isothermal forging of Ti-6242

Abstract An investigation of flow stress and microstructure development in non-isothermal forging of Ti6Al2Sn4Zr2Mo (Ti-6242) has been conducted to validate the temperature history compensation method which was developed previously by Shen et al. Two comparisons are made in the present work: (1) observed flow patterns are compared to FEM predictions obtained using either: (a) the isothermal flow-stress relation modified with the same temperature-compensation scheme deduced from non-isothermal forging of Ti6Al4V; or (b) the measured flow stress law without temperature compensation; and (2) microstructures obtained from samples forged isothermally at different temperatures are compared to those which were developed in samples which experienced different temperature histories during non-isothermal forging. This investigation has revealed that plastic flow transients and microstructure development during non-isothermal forging of the two-phase region cannot be deduced from isothermal forging behavior alone.