Study of high-temperature hot deformation behavior of electrolytic nickel in homogenized industy

Abstract:

Hot deformation experiments were carried out on homogenized industrial electrolytic nickel using a Gleeble-3500 hot simulation tester, and the hot deformation behaviors were investigated at deformation temperatures of 900, 1000, 1100, and 1200 °C, and at strain rates of 0.01, 0.1, 1, and 10s_-1 ^{at a deformation amount of 60%}.The true stress-true strain curves were obtained based on the compression data, the effects of deformation temperature and strain rate on the mechanical properties of electrolytic nickel were analyzed, and the rheological stress eigenstructure equations were obtained, and the thermal processing diagrams were established based on the dynamic material model and the Prassd instability criterio.The results show that electrolytic nickel exhibits strong sensitivity to deformation temperature and strain rate, and the rheological stress decreases gradually with the increase of deformation temperature and the decrease of strain rate;The rheological stress reaches a peak and decreases to a certain value and then tends to stabilize, showing the characteristics of rheological softening;According to the thermal processing diagram, the better thermal processing range of electrolytic nickel is obtained as follows: deformation temperature 980~1040 °C, strain rate 3.16~10s_-1^; deformation temperature 1100 °C, strain rate 1~4 s_-1^.

Key words:Electrolytic nickel; Thermal deformation behavior; Constitutive equations; Thermal processing diagram