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以晶界迁移机制进行再结晶的材料,其稳定动态再结晶晶粒尺寸D取决于形变ZenerHol1omon参数(Z因子)。作者建立了反映DZ间关系的理论模型,进行了St41钢平面应变热变形动态再结晶实验,探讨了动态再结晶晶粒细化的机理。该理论模型为Sellars的经验公式提供了物理基础。研究结果表明,提高形变储存能是细化动态再结晶晶粒的重要途径。
The material that recrystallizes with the grain boundary migration mechanism, the stable dynamic recrystallization grain size D depends on the deformation ZenerHolomon parameter (Z factor). The author established a theoretical model reflecting the relationship between DZs and carried out dynamic recrystallization experiments on plane strain hot deformation of St41 steel to discuss the mechanism of dynamic recrystallization grain refinement. The theoretical model provides the physical basis for Sellars empirical formula. The results show that increasing the deformation storage energy is an important way to refine the dynamic recrystallization grains.