In the forging process of the train liner duplicate die forgings, the softening process is mainly due to the dynamic recovery, and its structure has also undergone certain changes. Then, in the initial stage of the deformation of the die forgings, they can form and uniformly distribute, and the high-density dislocation substructure. The limit can also be observed during cold deformation. When the softening process is not obvious, This hot deformation stage can be called a hot working step.

What is the forging process of die forgings?

Then, due to the improvement of the structural change in the softening process of the forging die, in the second stage, the formation of the polygonal boundary of the sub-crystal and the relatively high density of the free displacement are restricted by the regional sub-grain. During the deformation process, the polygonal sub-structure gradually replaces the hot-working structure, and the multilateral sub-structure itself is also changing, resulting in the formation of an almost equiaxed subwoofer at the end of the structural change of the die forging, The polygonal equiaxed substructure is invariant and corresponds to the tension in the rising part of the deformation diagram and the continuous change in the metal substructure.