胡晴航,田文春,李萍.基于有限元不同大塑性变形应变特征对比研究及组织分析[J].精密成形工程,2022,14(9):10-17.
HU Qing-hang,TIAN Wen-chun,LI Ping.Comparative Study on Strain Characteristics and Microstructure Analysis of Different Large Plastic Deformation Based on Finite Element Method[J].Journal of Netshape Forming Engineering,2022,14(9):10-17. |
| 基于有限元不同大塑性变形应变特征对比研究及组织分析 |
| Comparative Study on Strain Characteristics and Microstructure Analysis of Different Large Plastic Deformation Based on Finite Element Method |
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| DOI：10.3969/j.issn.1674-6457.2022.09.002 |
| 中文关键词: 应变分布特征 有限元模拟 变形行为 大塑性变形 |
| 英文关键词: strain distribution characteristics finite element simulation deformation behavior large plastic deformation |
| 基金项目:国家自然科学基金(51875158，51975175) |
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| 中文摘要: |
| 目的 探究往复挤压工艺(CEC)与往复挤扭镦工艺(SETE)的变形特点，并研究单道次变形后的金属流动行为和应变分布特征。方法 以低活化钢为材料，对CEC和SETE等2种工艺下的变形过程进行有限元模拟分析，获得3个道次变形后的CLAM钢等效应变云图，同时，开展相关试验以验证有限元模拟的准确性。结果 往复挤压工艺(CEC)与往复挤扭镦工艺(SETE)均能实现多道次累积应变，其中SETE下的单道次累积应变量更大，其各道次等效应变分别比CEC下的等效应变高2.47、5.06、7.84。0.5道次变形后，SETE下的平均硬度值比CEC下的高6.1HV。结论 在CEC与SETE下进行各道次变形后，边缘等效应变都高于心部等效应变，且1道次变形后应变均匀性相差不大，但随着道次的增加，SETE下的应变分布更加均匀。0.5道次变形后，CEC与SETE下的边缘晶粒尺寸均较心部晶粒尺寸细小，且SETE下的晶粒细化程度更高。 |
| 英文摘要: |
| The work aims to investigate the deformation characteristics of CEC and SETE, and study the metal flow behavior and strain distribution after single pass deformation. With low activation steel as material, the finite element simulation analysis of the deformation processes under CEC and SETE was carried out, and the equivalent strain cloud diagram of CLAM steel after three passes of deformation was obtained. At the same time, relevant tests were carried out to verify the accuracy of finite element simulation. Both CEC and SETE could realize multi-pass cumulative strain, in which the single pass cumulative strain of SETE was greater, and the equivalent strain of each pass was 2.47, 5.06 and 7.84 higher than that under CEC respectively. After 0.5 pass deformation, the average hardness value under SETE was 6.1HV higher than that under CEC. After each pass deformation under CEC and SETE, the edge equivalent strain is higher than that of the center, and the strain uniformity after 1 pass deformation has little difference, but the strain distribution under SETE is more uniform with the increase of passes. After 0.5 pass deformation, the grain size at the edge under CEC and SETE is smaller than that at the center, and the refinement degree under SETE is higher. |
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