关键词: 镁合金, 带内筋筒形件, 热强旋, 织构演变, 宏-细观耦合模型

Abstract: The texture of magnesium alloys is easily formed during plastic deformation, and the influence of thermal deformation and inner ribs structure on the texture of cylindrical parts with inner ribs is complicated. The deformation field information during hot power spinning was obtained through macro forming simulation, and the texture evolution model was constructed by interpolation algorithm and macro-meso coupled method, the texture evolution of magnesium alloy cylindrical parts with inner ribs during hot power was investigated, and the differences of deformation texture of spun workpiece between cylindrical wall and inner rib were discussed. The results show that the sheet texture of blank will gradually change to the basal fiber texture of spun workpiece. The c-axis of grains will be deflected from the tangential direction parallel to the tube blank to the radial direction parallel to the spun workpiece, and the deflection angle of the grains at cylindrical wall is larger than that at inner rib. The deflection angle of position of the maximum texture strength and the maximum polar density in the polar diagram are used as evaluation indexes for model reliability analysis. The relative errors between the predicted value and the experimental value at cylindrical wall and inner rib are less than 10%, which indicates that the macro-meso coupled model can accurately predict the transformation of texture type and strength.

Key words: magnesium alloy, cylindrical parts with inner ribs, hot power spinning, texture evolution, macro-meso coupled model