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基于Deform-3D有限元平台,建立了某规格AZ31镁合金型材ECAP复合挤压工艺(等通道挤压ECAP和正挤压耦合工艺)过程的宏微观耦合有限元模型。研究发现:型材突破模具出口后挤压力稳定在16000 kN左右;突破工作带的型材温度在449~473℃范围内波动;型材平均晶粒尺寸可细化到约6~6.5μm。试验结果和模拟结果吻合良好,验证了所建立有限元模型在宏观和微观规律预测时的稳定性和可靠性。该有限元模型和研究结果可为ECAP复合挤压工艺参数的合理取值、组织性能的有效控制提供理论依据。
Based on the Deform-3D finite element platform, a macro-micro coupled finite element model of ECAP composite extrusion process of EC31 magnesium alloy profile (ECAP and forward extrusion coupling process) was established. The results show that the extruding force of the profile after the exit of the die is stable at about 16000 kN. The temperature of the profile which breaks the working zone fluctuates within the range of 449 ~ 473 ℃. The average grain size of the profile can be refined to about 6 ~ 6.5μm. The experimental results are in good agreement with the simulation results, which verify the stability and reliability of the established finite element model in the macroscopic and microscopic prediction. The finite element model and the research results provide a theoretical basis for the reasonable value of the ECAP compound extrusion process parameters and the effective control of the organizational performance.