锻压技术

Ti6Al3Nb2Zr1Mo合金双态组织的热加工行为

英文标题：Hot working behavior of dual-state microstructure for Ti-6Al-3Nb-2Zr-1Mo alloy

单位：1.河南科技大学材料科学与工程学院 2.有色金属新材料与先进加工技术省部共建协同创新中心

关键词：Ti6Al3Nb2Zr1Mo合金双态组织热加工图显微组织力学性能

分类号：TG146.4

出版年,卷(期):页码：2021,46(6):212-219

摘要：

在Gleeble1500D热模拟实验机上对Ti6Al3Nb2Zr1Mo合金双态组织进行热模拟实验，变形温度为850~1050 ℃，应变速率为0.010~1.000 s-1，变形量为60%；根据不同条件下的应力峰值计算得其热变形激活能Q为786.609 kJ·m-1，并构建本构方程，最后在动态模型的基础上建立热加工图；利用金相显微镜(OM)和透射电子显微镜(TEM)观察其显微组织。实验结果表明，材料在热加工过程中会出现2个失稳区：变形温度为860~920 ℃、应变速率为0.075~0.330 s-1和变形温度为940~1030 ℃、应变速率为 0.010~0.058 s-1；1个加工稳定区：变形温度为920~1000 ℃、应变速率为0.048~0.280 s-1。变形温度为900 ℃、应变速率为0.10 s-1时，合金变形容易发生失稳；变形温度为1000 ℃、应变速率为0.050 s-1时，合金会出现绝热剪切带，从而导致材料在使用过程中失效；变形温度为950 ℃、应变速率为0.100 s-1时，合金的塑性和强度适中，疲劳强度和韧性提高，具有良好的综合力学性能。

The thermal simulation experiment of dual-state microstructure for Ti-6Al-3Nb-2Zr-1Mo alloy under the deformation temperature of 850-1050 ℃, the strain rate of 0.01-1 s-1 and the deformation amount of 60% was conducted by thermal simulation experiment machine Gleeble-1500D, the thermal deformation activation energy Q calculated from the peak stress under different conditions was 786.609 kJ·m-1, and the constitutive equation was constructed. Then, the hot processing map was established on the basis of dynamic model, and the microstructure was observed by metallographic microscope(OM) and transmission electron microscope(TEM). The experimental results show that there are two instability zones at the temperature of 860-920 ℃, the strain rate of 0.075-0.33 s-1 and the deformation temperature of 940-1030 ℃, the strain rate of 0.01-0.058 s-1, and one processing stability zone at the deformation temperature of 920-1000 ℃, the strain rate of 0.048-0.280 s-1. In addition, the alloy deformation is prone to instability at the deformation temperature of 900 ℃ and the strain rate of 0.10 s-1, and the adiabatic shear zone appears at the deformation temperature of 1000 ℃ and the strain rate of 0.050 s-1, which leads to the failure of material during use. However, at the deformation temperature of 950 ℃ and the strain rate of 0.100 s-1, the plasticity and strength of alloy are moderate, the fatigue strength and toughness are improved, and the alloy has good comprehensive mechanical properties.

基金项目：

河南省科技厅人才项目（17HASTIT026）

作者简介：罗高丽（1995-），女，硕士研究生 E-mail：lgl723310@163.com 通信作者：张凌峰（1974-），男，博士，教授 E-mail：zh_lingfeng@163.com

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