摘要
镁合金塑性变形过程中易形成织构,带内筋筒形件热强旋成形时的热变形、内筋结构等对织构的影响规律复杂。通过宏观成形模拟获得材料的热强旋变形场信息,采用插值算法及宏-细观耦合方法构建织构演变模型,研究镁合金带内筋筒形件热强旋过程中的织构演变,探讨旋压件壁部及筋部变形织构的差异。结果表明,热强旋过程中坯料的基面板织构将逐渐转变为旋压件的基面纤维织构,且晶粒c轴将由平行于管坯切向朝平行于旋压件径向偏转,壁部相比筋部晶粒具有更大的偏转角度;以最大织构强度位置的偏转角度及极图中最大极密度作为评价指标进行模型可靠性分析,壁部及筋部预测值与试验值的相对误差均小于10%,所构建的宏-细观耦合模型准确地预测了织构类型及强度的转变。
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.
作者
袁帅
夏琴香
龙锦川
肖刚锋
YUAN Shuai;XIA Qinxiang;LONG Jinchuan;XIAO Gangfeng(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2023年第14期54-63,共10页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51775194)。
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
magnesium alloy
cylindrical parts with inner ribs
hot power spinning
texture evolution
macro-meso coupled model
