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通过对不同变形路径等径弯曲通道(Equal Channel Angular Pressing,ECAP)变形过程的数值模拟,获得了4种路径8道次ECAP变形的等效应变分布图,分析了挤压试样变形不均匀现象及其形成原因。结果表明,试样尾部与冲头的摩擦、头部未发生明显剪切变形是这两个部位变形程度低的主要原因,造成了ECAP变形的不均匀现象,而这两个部位的不同转移方式,又形成了各种挤压路径的ECAP变形差异。试样中间截面上平均等效应变排序为C>BC>A>BA,分别为10.416、10.358、8.669和8.530;试样中间截面等效应变不均匀程度的系数排序为C>BC>A>BA,分别为0.090、0.112、0.154和0.467。若追求细化效果应选择路径BC和路径C;如果追求试样材料整体均匀性,可以采用路径A。
Through the numerical simulation of the deformation process of equal channel Angular Pressing (ECAP), the equivalent strain distributions of ECAP deformations of four paths and eight passes were obtained. The deformation deformation of extruded specimens was analyzed And its formation reasons. The results show that the friction between the tail of the specimen and the punch and the absence of significant shear deformation of the head are the main causes of the low deformation of the two parts, resulting in the non-uniform ECAP deformation. The different transfer modes of these two parts , But also formed a variety of extrusion path ECAP deformation differences. The average equivalent strain on the middle cross section of the sample is C> BC> A> BA, which are 10.416, 10.358, 8.669 and 8.530, respectively. The coefficients of the equivalent strain nonuniformity in the middle section of the sample are C> BC> A> BA 0.090, 0.112, 0.164 and 0.467, respectively. If the pursuit of refinement should choose the path BC and path C; if the pursuit of the overall uniformity of the sample material, you can use the path A.