此图所示为 1050 ℃稳定穿孔阶段 坯料外表面及纵剖面的应变速率分布。从图中可以看出，除坯料与导围工具接触地方外，绝大多数坯料所承 受的应变速率都在 1 s-1 量级，从而验证了加工图中两 相区低应变速率工艺窗口不适合斜轧穿孔变形。

This figure shows the strain rate distribution on the outer surface and longitudinal section of the blank during the stable perforation stage at 1050 ℃. It can be seen from the figure that, except for the place where the blank is in contact with the enclosing tool, the strain rate of most blanks is in the order of 1 s-1, which verifies that the low strain rate process window of the two-phase region in the processing diagram is not Suitable for cross-rolling piercing deformation.