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研究了不同温度及保温时间电脉冲热处理对等轴组织热轧TC4钛合金微观组织和力学性能的影响。研究发现,电脉冲热处理能在5 min内将材料的原始等轴组织转变成魏氏组织,且温度越高,组织转变所需的时间越短;在组织转变前,原始热轧组织发生了一定程度的再结晶,转变成魏氏组织后晶粒随着温度的升高及保温时间的延长而长大。电脉冲热处理后的材料其准静态压缩塑性和动态压缩塑性均显著提高,绝热剪切敏感性显著降低,且随着热处理温度的升高及保温时间的延长,材料的准静态和动态压缩塑性呈现下降的趋势。经过1000℃/5 min电脉冲处理的钛合金综合力学性能最好,与原始热轧TC4钛合金相比,绝热剪切临界破坏应变提高了133%,绝热剪切破坏的临界单位体积吸收功提高了192%。
The effects of electric pulse heat treatment at different temperatures and holding time on the microstructure and mechanical properties of hot rolled TC4 titanium alloy were studied. The study found that the electrical pulse heat treatment can transform the original equiaxed tissue into Widmanstatu in 5 min, and the higher the temperature, the shorter the time required for the transformation of the microstructure. Before the transformation, the original hot-rolled microstructure had a certain Degree of recrystallization, transformed into Widmanstatten grains grow with the increase of temperature and holding time. The quasi-static compressive plasticity and dynamic compressive plasticity of the material after electrical pulse heat treatment are significantly improved, the adiabatic shear sensitivity is significantly reduced, and with the increase of heat treatment temperature and holding time, the material quasi-static and dynamic compression plasticity Downward trend. Compared with the original hot-rolled TC4 titanium alloy, the critical mechanical strain of adiabatic shear increased by 133% and the critical unit volume absorbed energy of adiabatic shear failure increased after 1000 ℃ / 5 min electrical pulse treatment. 192%.