TC4-DT钛合金β锻动态再结晶元胞自动机模拟

Cellular Automaton Simulation of Dynamic Recrystallization for TC4-DT Titanium Alloy in β Hot Process

通过对TC4-DT钛合金β单相区的等温恒应变速率压缩实验,分析合金的动态再结晶行为,并建立合金的动态再结晶的元胞自动机模型(CA模型)。在DEFORM-3D平台上,采用CA法模拟TC4-DT钛合金压缩过程中的显微组织演变。结果表明:随着应变量的增加动态再结晶的发生越来越充分;试样不同部位发生的动态再结晶程度有所不同,中心区域发生的动态再结晶更充分,很好地细化了原始组织;动态再结晶行为随着应变速率的增大而逐渐被抑制,但晶粒尺寸反而减小;模拟结果与实验结果相当吻合。

The TC4-DT titanium alloy dynamic recrystallization behavior was analyzed and cellular automaton （CA） model of dynamic recrystallization was established by isothermal constant strain rate compression tests in the β hot process. The mierostrueture evolution of TC4-DT titanium alloy was simulated on platform of DEFORM-3D using Cellular automaton. The simulated results show that the dy- namic reerystallization behavior is more and more fully with the strain increased. The degree of dynamic recrystallization occurring at different regions of the sample is different. The dynamic recrystallization behavior of the central region is more fully and refines the orig- inal mierostructure. The dynamic recrystallization behavior is inhibited with the increase of strain rate, but the grain size decreases. The simulation results agree well with the experimental results.