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为了通过大塑性变形技术制备出满足工业需求的大尺寸块体超细晶材料,采用有限元法模拟了不同尺寸挤压件的1、2道次等径角挤压过程,得到了各挤压件的等效应变、等效应力和载荷曲线。分析得出:挤压件尺寸对等效应变的大小和分布以及等效应力的大小影响甚微;但随着挤压件尺寸的增大,等效应力和2道次等效应变的分布均匀性降低,挤压载荷增大。这表明:经过多道次等径角挤压的大尺寸挤压件可以获得晶粒分布均匀的大块体超细晶材料。
In order to prepare the large-size ultrafine-grained bulk materials that meet the industrial requirements through the plastic deformation technology, the finite element method was used to simulate the 1, 2-pass equal-angular-angle extrusion process of the extruded products with different sizes, Equivalent strain, equivalent stress and load curve. It is concluded that the size of the extrusion has little effect on the size and distribution of the equivalent strain and the size of the equivalent stress. However, with the increase of the extrusion size, the equivalent stress and the equivalent distribution of 2 passes are uniform Reduce sexual, squeeze load increases. This shows that large-sized ultrafine-grained materials with uniform grain distribution can be obtained by large-size extrusion with multiple passes at equal angular angular.