以准φ30 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。 In this paper, 20CrMnTi pancake-like specimens of standard φ30 mm × 3 mm were taken as the research object. The finite element method was used to simulate the high-pressure torsional forming process of specimens. The distribution and trend of strain in the forming process were analyzed. Deformation was applied to the specimen by means of a press-twist apparatus and a mold. The microstructure of the four regions 0, 5, 10 and 15 mm at the center of the end face before and after the deformation was observed and the microhardness was measured. The results show that the microstructure of the sample is remarkably refined after high-pressure torsion. The Vickers hardness is 2866.5 MPa at the distance of 5 mm from the end face of the sample, which increases by 83.0% compared with the initial Vickers hardness. The equivalent strain and microhardness along the radial direction of the end face of the specimen are different, the center of the heart is the smallest, the edge is second, and the middle is the largest.