Ti-4Al-3V合金的高温热变形行为  

Thermal Deformation Behavior of Ti-4Al-3V Alloy at High Temperature

作　　者：梁海成[1] 闫晓舜 张志强[2] 柏春光[2] 李雕峰 杨亮[2] LIANG Haicheng;YAN Xiaoshun;ZHANG Zhiqiang;BAI Chunguang;LI Diaofeng;YANG Liang(Shenyang Ligong University,Shenyang 110159,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110159 [2]中国科学院金属研究所,沈阳110016

出　　处：《沈阳理工大学学报》2022年第3期59-65,83,共8页Journal of Shenyang Ligong University

基　　金：辽宁省自然科学基金项目(2021-MS-005)。

摘　　要：采用Gleeble3800热模拟机对钛合金Ti-4Al-3V在不同温度、不同应变速率下进行热压缩实验,分析变形后的组织,研究变形温度和应变速率对流变应力的影响规律,构建Ti-4Al-3V合金的流变应力本构方程并绘制合金的热加工图。研究结果表明:材料变形时的峰值应力随变形温度的升高和应变速率的减小而减小,峰值应力对应变速率的敏感性随温度升高而降低;在给定参数下,Ti-4Al-3V合金的变形激活能为296.8kJ/mol。对热加工图分析得出Ti-4Al-3V合金理想的热加工窗口为:变形温度700~820℃、应变速率0.001~0.004s^(-1);变形温度830~920℃、应变速率0.001~0.05s^(-1)。Gleeble3800 thermal simulator was used to conduct thermal compression experiments on Ti-4Al-3V alloy at different temperatures and strain rates.Firstly, the microstructure caused by deformation was analyzed.And then the effects of deformation temperature and strain rate on flow stress were analyzed.The flow stress constitutive equation of Ti-4Al-3V alloy was constructed, and the hot working diagram of Ti-4Al-3V alloy was drawn.It was found in the study that the peak stress during material deformation decreased with the increase of the deformation temperature and the decrease of the strain rate, and the sensitivity of the peak stress to the strain rate decreased with the increase of temperature.With given parameters, the deformation activation energy of Ti-4Al-3V alloy was 296.8 kJ/mol.It was found by analyzing the hot working diagram that the suitable deformation window for Ti-4Al-3V alloy was 700~820℃ of temperature with 0.001~0.004 s^(-1)of strain rate or 830~920℃ of temperature with 0.001~0.05 s^(-1)of strain rate.

关 键 词：钛合金 热压缩 应力-应变曲线 本构方程 热加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]