AZ31B镁合金双道次热变形过程流变应力特征模拟研究
发布时间：2018-04-02 05:20
本文选题：AZB 切入点：双道次热压缩 出处：《航空材料学报》2017年03期
【摘要】：建立了一类镁合金双道次热变形过程的二维元胞自动机模型。考虑到镁合金具有六重对称的密排六方晶体结构,模型采用了六边形元胞网格。另外,通过计算位错密度演变和设定晶粒形核长大规则,模型将热变形过程中动态再结晶、静态回复、静态再结晶、亚动态再结晶和晶粒长大等单个物理过程耦合到一起。为了验证模型,将其应用到AZ31B镁合金单道次和双道次热压缩过程。探讨了不同变形温度、应变速率、道次间隔和预应变对应力-应变曲线的影响。将计算结果和实验结果进行了对比,吻合较好。
[Abstract]:A two-dimensional cellular automaton model for two-pass secondary thermal deformation of magnesium alloys is established. Considering the hexagonal hexagonal crystal structure of magnesium alloys with hexagonal symmetry, the model adopts hexagonal cellular meshes. The dynamic recrystallization, static recovery and static recrystallization in the process of thermal deformation are obtained by calculating the evolution of dislocation density and setting the rules of nucleation and growth of grain. The single physical processes such as sub-dynamic recrystallization and grain growth are coupled together. In order to verify the model, the model is applied to the single-pass and double-pass thermal compression processes of AZ31B magnesium alloys. Different deformation temperatures and strain rates are discussed. The effect of pass interval and prestrain on the stress-strain curve is compared with the experimental results, and the calculated results are in good agreement with the experimental results.
【作者单位】： 天津职业技术师范大学天津市高速切削与精密加工重点实验室;天津职业技术师范大学天津市模具数字化制造技术工程中心;辽宁科技大学材料科学与工程学院;日本W窆ひ荡笱榷丝蒲а芯克，
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