AZ31镁合金无缝管材冷轧成形过程研究

Cold Roll Forming Process of AZ31 Magnesium Alloy Seamless Pipe

镁合金在室温下塑性较差,导致其在轧制过程中组织分布不均而引起应力差异,因此从镁合金材料特性角度出发,分析成形过程中力学特征及组织演变过程就显得至关重要。基于此,本研究通过实验建立AZ31镁合金分段本构模型,构建包含晶粒拓扑技术的元胞自动机模型。借助二次开发技术,将上述本构模型、元胞自动机与有限元软件结合起来进行仿真,获得包含应力、应变、晶粒大小和分布规律等预测结果,对控制皮尔格轧制AZ31镁合金成形工艺以实现对成形和性能的协调控制具有一定意义,并通过实验对模拟结果进行验证。

Magnesium alloys have poor plasticity at room temperature,which leads to uneven distribution and stress difference of microstructure during rolling.Therefore,it is important to analyze the mechanical characteristics and microstructure evolution from the angle of material properties.Based on this,a piecewise constitutive model of AZ31 magnesium alloy was established by experiments,and a cellular automata model including grain topology technology was constructed.With the aid of secondary development technology,the constitutive model,cellular automata and finite element software were combined for simulation,and the predicted results including stress,strain,grain size and distribution law were obtained.It is of certain significance to control the forming process of AZ31 magnesium alloy rolled by Pilger to realize the coordinated control of forming and properties,and the simulation results were verified by experiments.