20CrMnTi高压扭转有限元模拟及实验
FEM and Experiment on Pie-shaped 20CrMnTi by High-pressure Torsion
魏 兴1,2, 刘 为1, 许 锋1, 薛克敏1
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作者单位：(1. 合肥工业大学 材料科学与工程学院, 安徽 合肥 230009; 2. 六安职业技术学院 机电工程系, 安徽 六安 237158)
中文关键字：20CrMnTi； 高压扭转； 有限元模拟； 显微组织； 显微硬度
英文关键字：20CrMnTi; high-pressure torsion; FEM; microstructure; microhardness
中文摘要：以 30 mm × 3 mm的20CrMnTi圆饼状试样为研究对象，采用有限元法对试样的高压扭转成形过程进行数值模拟，分析成形过程中应变的分布和变化趋势。通过压扭设备和模具对试样施加变形，观察变形前后距离试样端面中心处0、5、10和15 mm四区域的金相组织并测试显微硬度。结果表明：高压扭转后，试样组织明显细化，在距离试样端面心部5 mm处维氏硬度值最大，为2866.5 MPa，相比初始组织维氏硬度提高83.0%。试样端面沿径向的等效应变和显微硬度不同，心部最小，边缘处次之，中间区域最大。
英文摘要：Pie-shaped 20CrMnTi (30 mm× 3 mm) processed by high-pressure torsion (HPT) was studied by finite element method (FEM), the distributing and the variational trend of strain in HPT process were analyzed. Microstructure and microhardness of 4 regions (the center, 5 mm away from center,10 mm away from center, 15 mm away from center) on the end surface of undeformed and deformed specimens were examined. The results indicate that HPT can effectively refine the microstructure. Vickers hardness reaches the biggest value (2866.5 MPa) in the region of 5 mm away from center, improves by 83.0% compared with that of the original structure. The strain-effective and microhardness of different regions in the specimen are different，the center region is smallest, the corner region is bigger, the middle region is biggest.