等通道角挤压层片状珠光体的数值模拟与实验验证
Numeical Simulation on Lamella Pearlite by ECAP and Experimental Verification
贺甜甜1, 熊 毅1,2, 郭志强1, 任凤章1
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作者单位：(1. 河南科技大学 材料科学与工程学院, 河南 洛阳 471003; 2. 燕山大学 亚稳材料制备技术与科学国家重点实验室, 河北 秦皇岛 066004)
中文关键字：等通道角挤压； 数值模拟； T8钢； 等效应变
英文关键字：equal channel angular pressing; numerical simulation; T8 steel; equivalent strain
中文摘要：采用有限元软件DEFORM-3D对原始组织为层片状珠光体的T8钢在Bc方式下多道次ECAP过程进行了热力耦合数值模拟，并对该过程进行了实验验证。结果表明，在ECAP挤压过程中，塑性变形主要集中在模具拐角，且模具内拐角处金属的流动性较模具外拐角处好；随挤压道次的增加，变形的均匀程度逐渐增加，累积等效应变也随之增大，组织细化效果也越明显，数值模拟与实验结果基本吻合；随摩擦系数和挤压速度的增加，等效应变有所增大，应变影响区逐渐扩大，变形的不均匀程度也逐渐增加。
英文摘要：The ECAP process of multiple passes via route Bc in a fully pearlitic structure T8 steel was numerically simulated by coupled thermo-mechanical finite element method(FEM) based on the finite element software Deform-3D. The multiple-pass ECAP experiment results were also analyzed. The results show that the deformation zone is mainly located around the cross area of the two channels and the metal flow near inner arc angle is superior to the outer arc angle. The uniformity of the plastic deformation can be effectively enhanced and the grain size can be reduced, and the cumulate equivalent strain can be increased with the passes increasing. The calculated results are in good agreement with experimental ones. The friction factor and pressing speed have great effects on the distribution of the strain field. The higher the friction factor and pressing speed, the larger the deformation zone expanding, the more the uneven of the plastic deformation.