高纯铝多向锻造大塑性变形过程的数值模拟及实验研究

发布时间：2018-10-29 11:55

【摘要】：采用多向锻造的方法研究室温下锻造道次对高纯铝组织的影响,并用三维DEFORM软件对实验过程进行模拟。结果表明:经3次多向锻造后,高纯铝试样横截面上形成1个X形的细晶区及4个粗晶区,随锻造道次增至9,细晶区的面积不断扩大,粗晶区的面积不断缩小,但细晶区与粗晶区的晶粒尺寸差异并未消除。当高纯铝试样心部的等效应变量达到2.5时,心部再结晶晶粒尺寸达到70μm,继续增加心部的等效应变至6.0,心部的晶粒不再随等效应变量的增加而细化,达到晶粒细化的极限。而当试样边部难变形区和自由变形区的等效应变量增至4.0时,其再结晶晶粒仍随等效应变量的增加而细化,未达到晶粒细化极限。这表明局部等效应变量及局部变形方式均是影响高纯铝晶粒细化的重要因素。
[Abstract]:The effect of forging passes on the microstructure of high purity aluminum was studied by multidirectional forging method. The experimental process was simulated by using 3D DEFORM software. The results show that after three times of multi-direction forging, one X shape fine grain area and four coarse grain regions are formed on the cross section of high purity aluminum sample. With the increase of forging pass number 9, the area of fine grain area expands continuously and the area of coarse grain area decreases continuously. However, the difference of grain size between fine grain region and coarse grain region has not been eliminated. When the equivalent strain of the core reaches 2.5, the recrystallization grain size of the core reaches 70 渭 m, which continues to increase the equivalent strain of the core to 6.0, and the grain in the core is no longer refined with the increase of the equal effect variable. The limit of grain refinement is reached. However, when the equivalent strain of the hard deformation zone and free deformation zone increases to 4.0, the recrystallization grain is refined with the increase of the equal effect variables, and the grain refinement limit is not reached. This indicates that both local equivalent strain and local deformation are important factors affecting grain refinement of high purity aluminum.
【作者单位】：东北大学材料电磁过程研究教育部重点实验室;
【基金】：国家自然科学基金资助项目(51204053,51374067) 中央高校基本科研资助项目(N130409005,N130709001,N130209001)
【分类号】：TG319

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