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在1100℃和应变速率5×10~(-2)s~(-1)条件下对Cr25Ti铁素体钢进行热变形模拟试验,有动态再结晶发生.在变形早期有少部分晶界形核,随后均匀形核.较强的动态回复促使形成大量完好亚晶,变形诱发亚晶转动和亚晶界合并形成新晶粒.观察到原晶粒中的亚晶不断倾转弯曲或扭转形成再结晶晶粒间的位向关系.这表明此合金动态再结晶的形核方式与某些矿物类似,主要以应变诱发亚晶逐渐转动而均匀形核.这种较大程度的不同时性形核,使动态再结晶的应力峰不明显.
The thermal deformation of Cr25Ti ferritic steel was simulated at 1100 ℃ and strain rate of 5 × 10 ~ (-2) s ~ (-1) with dynamic recrystallization, with a small amount of grain boundary nucleation , Followed by uniform nucleation.The strong dynamic response prompted the formation of a large number of intact subgrains, deformation induced subgrain rotation and subgrain boundary merge into a new grain.It is observed that the original grain subgrain continuous bending or twisting formation Which indicates that the dynamic recrystallization of this alloy is similar to that of some minerals in the form of nucleation, which is mainly due to the gradual rotation of the strain-induced subgrains and uniform nucleation. This larger degree of non-simultaneous nucleation , The stress peak of dynamic recrystallization is not obvious.