Influencing factors of global and local deformation in hot compression

Abstract Hot compression of cylindrical specimens is carried out with Gleeble tests and simulated with the finite element method. Profiles of the specimens and the local strains are evaluated at different reductions, friction coefficients and temperature gradients. No correlations are identified between the profiles and the flow stress - strain behaviors. Bulging of the specimens depends on the friction coefficient and temperature gradient. Variations in the effective strain at the center on the cross section correlate with the bulging. The corresponding changes of the local strain on the edge with bulging are diminished by introducing frictions and temperature gradients.