(1. 华南理工大学机械与汽车工程学院，广州 510640；
2. 河南牧业经济学院能源与智能工程学院，郑州 450011)
摘 要: 通过宏-细观耦合模拟，研究不同温度和减薄率下镁合金带内筋筒形件壁部和筋部织构的演变规律，并结合宏观和细观分析对织构演变原因进行探究。结果表明，热强旋过程中晶粒c轴朝平行于旋压件径向偏转。减薄率相同时，壁部晶粒由于较大的径向压应力作用产生比筋部更大的偏转角度；滑移系累积剪应变随减薄率增加具有与宏观真实应变一致的线性增大特点，这将引起织构强度的不断增加。温度对织构类型影响显著，旋压件在较低温度时保持坯料基面板织构特征，随温度的增加，晶粒c轴发生大角度偏转，板织构特征减弱；随着温度的升高，筋部应变量相比壁部具有更大的增幅，这是温度对筋部织构强度影响更为显著的原因。
关键字: 镁合金；带内筋筒形件；热强旋；织构演变；宏-细观耦合模拟
（1. School of Mechanical and Automotive Engineering, South China
University of Technology,Guangzhou 510640, China;
2. School of Energy and Intelligence Engineering,
Henan University of Animal Husbandry and Economy, Zhengzhou 450011, China）
Abstract:By the simulation study on the macro-meso coupled texture evolution, the evolution law of deformation texture at cylindrical wall and inner rib of magnesium alloy cylindrical parts with inner ribs at different spinning temperatures and thinning rates of wall thickness was studied during hot power spinning, and the reasons of texture evolution law were explored combined with macro and meso deformation analysis. The results show that the c-axis of grains will deflect parallel to the radial direction of spun workpiece during hot power spinning, and the deflection angle of the grains at cylindrical wall is larger than that at inner rib under the action of large radial compressive stress. With the increase of thinning rate of wall thickness, the cumulative shear strain of slip systems increases linearly with increasing macro real strain, which will lead to the continuous increasing of texture strength. Temperature has a significant effect on the texture type. The spun workpiece still maintains the texture characteristics of basal plane of blank at lower temperature. With the increase of temperature, the c-axis of grains deflects with a large angle, and the plane texture characteristics weaken continuously. The larger the increasment of the strain at inner rib than that at cylindrical wall as the temperature rising is the reason why the temperature has a more significant effect on the texture strength at inner rib.
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