电流大小对TC4钛合金高温压缩力学行为的影响分析

为了研究电流大小对TC4钛合金高温压缩力学行为的影响,利用Gleeble-1500D动态热-力学模拟机,以电流作为加热源,分别以不同的升温速度将晶粒尺寸为8μm、16μm和20μm的TC4小圆柱体试样加热至700℃进行恒温压缩。结果表明：升温阶段的电流大小对应力影响大,大电流有利于塑性变形。电流降低了恒温变形阶段材料的动态再结晶温度,促进动态再结晶软化,降低变形抗力,有利于塑性变形,电流越大效果越明显。

Effect Analysis of Electric Current on the High-temperature Compressive Mechanical Behavior of TC4 Titanium Alloy

In order to study the effect of electric current on the high-temperature compressive mechanical behavior of TC4 titanium alloy,Gleeble-1500 D dynamic thermal-mechanical simulator is used to realize constant temperature compression deformation of TC4 titanium alloy with different grain sizes of 8μm, 16μm and 20μm,electric current is taken as heating source to heat the samples to 700℃ with heating rate of 10℃/s and 50℃/s. The research results show that： electric current has a greater impact on stress in the heating process,strong current is advantageous to the plastic deformation. Electric current can not only reduce dynamic recrystallization temperature in the constant temperature deformation stage,but also promote dynamic recrystallization softening and reduce deformation resistance. The stronger electric current can realize more obvious plastic deformation.