挤压速度对Ti6Al4V钛合金等通道转直角挤压过程影响的数值模拟

Numerical simulation of equal-channel angular pressing process of Ti6Al4V titanium alloy at a right angle and different extrussion speed

采用Deform-3D有限元软件,对样品初始温度为900℃的Ti6Al4V钛合金等通道转直角挤压在0~5mm/s的下压速度范围内进行了数值模拟。模拟计算结果表明:在相同的挤压速度下,试样通过转角后的温度降低速率减小;挤压速度越大,挤压过程所需的荷载越低,应变累积越小,等效应力越低,应力集中现象越少,挤压过程中试样的温降越小;本研究条件下,挤压速度值选定为5mm/s。

An extrusion process of Ti6Al4Vtitanium alloy at 900℃ under equal-channel angular pressing(ECAP)at a 90°angle was numerically simulated at a different extrusion speed in the range of 0~5mm/s by using Deform-3Dfinite element software.The simulation results show that at the same extrusion speed,the rate of temperature decrease after the sample passes through the corner is reduced;the higher the extrusion speed,the lower the load required for the extrusion process,the smaller the strain accumulation,the lower the equivalent stress,the less the stress concentration phenomenon,and the smaller the temperature drop of the sample in the extrusion process.In this study,the extrusion speed was selected as 5mm/s.