Ti-1023合金高温冲击扭转行为的实验研究

Experimental Study on the High Temperature Impact Torsional Behavior of Ti-1023 Alloy.

作者信息

Li Lintao, Wang Zhihua, Ma Wei

机构信息

Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China.

Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, China.

出版信息

Materials (Basel). 2022 May 27;15(11):3847. doi: 10.3390/ma15113847.

DOI:10.3390/ma15113847

PMID:35683146

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9181734/

Abstract

Based on the modified Hopkinson torsion bar, a high-temperature dynamic shear test method was proposed for the Ti-1023 alloy, and the microstructural evolution of the tested material at different temperatures was studied. By using the modified high-temperature Hopkinson torsion bar, high-temperature testing within 1000 °C can be achieved. As the specimen-heating rate was fast, and the temperature gradient of the experimental environment was small, valid experimental data can be ensured during the experiment. The experimental results show that stress-induced martensite can significantly enhance the strength of the Ti-1023 alloy. Dynamically recrystallized grains similar to those in adiabatic shear bands appear in the microstructure of the Ti-1023 alloy after severe plastic deformation. Therefore, it is possible to regulate the content of stress-induced martensite in the microstructure to improve the mechanical properties of other alloys that are similar to β titanium alloys.

摘要

基于改进的霍普金森扭杆，提出了一种针对Ti-1023合金的高温动态剪切试验方法，并研究了被测材料在不同温度下的微观结构演变。通过使用改进的高温霍普金森扭杆，可以实现1000℃以内的高温测试。由于试样加热速率快，且实验环境的温度梯度小，在实验过程中可以确保获得有效的实验数据。实验结果表明，应力诱发马氏体可显著提高Ti-1023合金的强度。在Ti-1023合金经过严重塑性变形后的微观结构中出现了类似于绝热剪切带中的动态再结晶晶粒。因此，有可能通过调节微观结构中应力诱发马氏体的含量来改善其他类似于β钛合金的合金的力学性能。