论文部分内容阅读
通过对传统孔型的讨论和模拟的结果分析,基于大塑性变形原理的晶粒超微细化方法,提出了均匀大应变棒材轧制的新型孔型设计思想,建立了以多向大塑性变形加工为特点的扁椭圆系列孔型。采用非线性有限元法,建立了孔型棒材温轧过程数值分析模型,对比分析了新型孔型系列与传统孔型系列轧件断面内塑性应变分布规律,得出了在满足形状尺寸精确的条件下新型扁椭孔型能更好地将大塑性应变引入到断面中心,并使断面塑性应变趋于均匀,其中心处最大累积应变超过5.0,达到产生超微细晶粒的大塑性变形制备条件。
Based on the discussion of the traditional pass and the simulation results, a new pass design method of uniform large strain bar rolling is proposed based on the method of grain refinement based on the principle of large plastic deformation. A multi-directional large plastic deformation Processing characteristics of the flat oval series of holes. The nonlinear finite element method is used to establish the numerical analysis model of the warm rolling process of the hole bar. The plastic strain distribution in the cross section of the new pass series and the traditional pass series is contrasted and analyzed. Under the conditions of a new type of flat oval hole can be better to introduce a large plastic strain into the center of the section, and the plastic deformation of the section tends to be uniform, the center of the maximum cumulative strain exceeds 5.0, to produce ultra-fine grain deformation of the plastic deformation conditions .