SP700钛合金热压缩失稳变形数值模拟研究

Numerical Simulation Research on Hot Compression Instability of SP700 Titanium Alloy

摘要:

利用SP700钛合金在Gleeble-3800型热模拟试验机下进行等温恒应变速率压缩得到的实验数据,构建出基于Prasad失稳准则的失稳图,得到在变形温度为700 ~ 950 ℃、应变速率为0.001 ~ 1 s_^-1时SP700钛合金的热压缩失稳变形的边界条件,并以此为基础结合Deform-3D有限元软件对SP700钛合金在热压缩过程中失稳变形区域的分布及变化情况进行有限元数值模拟研究。结果表明：热压缩实验得到的SP700钛合金微观组织与有限元数值模拟结果的吻合度较高,即通过Deform-3D有限元软件可以有效模拟预测出SP700钛合金热压缩过程的失稳变形区域的分布及变化情况。

Abstract:

Using the experimental data obtained by isothermal and constant strain rate compression of the SP700 titanium alloy under the Gleeble-3800 thermal simulation test machine, the instability map based on the Prasad instability criterion is constructed. The boundary conditions for the thermal compression instability deformation of SP700 titanium alloy when the deformation temperature is 700 ~ 950 ℃ and the strain rate is 0.001 ~ 1 s_^-1 are obtained. Based on this, combined with Deform-3D finite element software to analyze the SP700 titanium alloy in the process of hot compression, the distribution and change of the unstable deformation area are studied by finite element numerical simulation.The results show that the microstructure of the SP700 titanium alloy obtained by the hot compression experiment is in good agreement with the finite element numerical simulation results. The Deform-3D finite element software can effectively simulate and predict the distribution and change of the unstable deformation area of the SP700 titanium alloy during the hot compression process.