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模具锥角α是影响镁合金型材热减径挤压动态再结晶行为的重要参数之一,通过建立AZ31镁合金棒材热减径挤压工艺动态再结晶预测模型,并针对模拟结果进行了挤压实验,对模具锥角α的影响规律进行了研究。结果表明:晶粒尺寸沿径向由中心向表层逐渐细化,沿轴向呈带状分布;随模具锥角α的增大,型材表层金属晶粒尺寸细化程度不断加剧;当模具锥角α从50°过渡到90°时,挤压型材表层金属平均晶粒尺寸细化程度提升25%,实验与模拟结果吻合良好。
The mold taper angle α is one of the most important parameters that influence the dynamic recrystallization behavior of hot reduction extrusion of magnesium alloy profiles. By establishing the dynamic recrystallization prediction model of hot reduction extrusion process of AZ31 magnesium alloy bar, the simulation results are squeezed Pressure experiment, the impact of the mold taper angle α were studied. The results show that the grain size gradually decreases from the center to the surface along the radial direction, and distributes along the axial direction. With the increase of the taper angle α, the grain refinement of the metal surface of the profile increases. When the α transition from 50 ° to 90 °, the average grain size refinement of the surface profile of extruded section increased by 25%. The experimental and simulation results agree well.