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利用SPS设备对网篮组织的热轧TC4合金进行电脉冲热处理,研究了电脉冲热处理对TC4合金力学性能和绝热剪切特性的影响。结果表明,电脉冲热处理对TC4合金的静态压缩强度、塑性和动态压缩屈服强度无明显影响,对TC4合金的绝热剪切临界破坏应变和绝热剪切破坏前材料的单位体积吸收功有显著影响。经900℃热处理后,TC4合金的绝热剪切临界破坏应变和单位体积吸收功均达到最大值,与未经热处理的热轧TC4合金相比分别提高了57%和42%,表明TC4合金的绝热剪切敏感性显著降低。微观分析表明,电脉冲热处理可调节TC4合金的原始β晶粒尺寸、集束尺寸和板条宽度等细节组织特征,经900℃电脉冲热处理后,热轧TC4合金的原始β晶粒尺寸显著细化,β转变组织集束尺寸增大,α板条宽度保持不变。
The mechanical properties of TC4 alloy and the adiabatic shear properties of TC4 alloy were investigated by means of SPS equipment. The effects of electrical pulse heat treatment on the mechanical properties and adiabatic shear properties of TC4 alloy were studied. The results show that the electrical pulse heat treatment has no significant effect on the static compressive strength, ductility and dynamic compressive yield strength of TC4 alloy, but has a significant effect on the critical failure strain of adiabatic shear of TC4 alloy and the absorbed energy per unit volume of the material before adiabatic shear failure. After heat treatment at 900 ℃, the critical failure strain and the absorbed energy per unit volume of TC4 alloy reached the maximum value, which were increased by 57% and 42% respectively compared with the hot-rolled TC4 alloy without heat treatment, indicating that the TC4 alloy’s adiabatic Shear sensitivity is significantly reduced. The microscopic analysis shows that the electrical pulse heat treatment can adjust the original β crystal grain size, the cluster size and the width of the strip, etc. The microstructure characteristics of the TC4 alloy after heat treatment at 900 ℃, the original β grain size of hot-rolled TC4 alloy significantly refined , beta-transforming tissue bundle size increases, α width of the strip remains unchanged.