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采用Deform软件模拟TC4钛合金棒材以连续变断面循环挤压细化组织效果较好的一组参数:变形温度800℃,挤压速度2 mm/s,6道次循环变形时的应力场、应变场及温度场。结果表明,随着变形循环道次的增加,应变量随之增加,在圆柱坯料高度方向的中间区域等效应变分布较为均匀;对比同一变形循环的挤压工序与镦粗工序,挤压工序的等效应力稍大;此外,变形试样中心区域的温度较高且为大变形区,其原因是试样外表面与模具之间存在热交换而导致试样表面温度较低。但就整体而言,试样变形量分布还是相对均匀,这与其显微组织及显微硬度沿径向分布较均匀的试验结果一致。
Deform software was used to simulate the TC4 titanium alloy bar to continuously change the fracture surface of a group of parameters of the microstructural better: deformation temperature 800 ℃, extrusion speed 2 mm / s, 6 times the cycle of deformation stress field, Strain field and temperature field. The results show that with the increase of deformation cycles, the amount of strain increases, and the equivalent strain distribution in the middle of the height direction of the blank is more uniform. Comparing the extrusion process with the upsetting process and the upsetting process in the same deformation cycle, The equivalent stress is slightly larger. In addition, the temperature in the center of the deformed specimen is high and the deformation area is large because of the heat exchange between the outer surface of the specimen and the mold, resulting in a lower surface temperature of the specimen. However, as a whole, the distribution of the deformation of the sample is still relatively uniform, which is consistent with the test results that the microstructure and the micro-hardness of the sample are evenly distributed in the radial direction.