TZM Alloy Deformation Resistance Affected By Deformation Rate

TZM alloy deformation resistance is affected by deformation temperature, deformation degree and deformation rate, and the impact of deformation temperature on deformation resistance are more obvious. When deformation rate is certain, deformation resistance increases with deformation temperature rises. The following mainly analyzes the influence of deformation rate on the deformation resistance of the alloy.

When the deformation temperature is certain, TZM alloy deformation resistance increases with deformation rate increases. As shown below, when the strain rate is small, the slope of the curve is large, showing that the deformation resistance increasing faster in this time, and then with strain rate increasing the deformation resistance is tend to flat. In the initial stage, with deformation rate increasing, the deformation resistance increases faster, and the dislocation density increases as well. Because the deformation rate is not great, the strain stress caused by dislocations strain has certain time to pass to other grain. When the dislocation density increase to a certain extent, Zr, Ti and other trace elements in TZM alloy will cause solid solution strengthening, increasing the lattice distortion, resulting in deformation strengthening, increasing work hardening, so at the initial stages the deformation resistance increased rapidly.

In initial stage, the deformation resistance increases rapidly, but with deformation rate further increases the deformation resistance increases stabilized. Because with deformation rate increasing, unit time deformation amount increases and dislocations tangles in motion, so that the energy of plastic deformation has no chance to pass to other grains, resulting in strain energy increase and deformation temperature increase, so the deformation metal to some extent occurs  dynamic recovery and dynamic recrystallization. Dynamic recovery and dynamic recrystallization softening effect can offset partially work hardening, so that the deformation resistance tend to stabilized with deformation rate further increase.

In general, the deformation resistance increases with deformation degree increases. When deformation rate is certain, the deformation resistance decreases with deformation temperature increases. When deformation temperature is certain, deformation resistance increases with strain rate increases.