Abstract

The effect of a pulsed current on titanium tensile deformation obtained by postdeformation annealing after cold rolling of the coarse-grained and ultrafine-grained states has been considered. The effect of the duty cycle of the pulse current over a wide range on the shape of the stress–strain curves and mechanical properties has been studied. It is shown that an increase in the duty cycle results in an enhancement in the thermal effect of the current and a decrease in the flow stresses, strength, and plasticity, as well as in intense necking. A decrease in the duty cycle leads to the absence of heating and the occurrence of the electroplastic effect and an increase in the strength and plasticity, which depends on the structural state of coarse-grained titanium and the method of titanium production. The possible physical mechanisms of hardening associated with twinning, strain aging, and low-cycle fatigue have been considered.

中文翻译：

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钛拉伸过程中脉冲电流占空比的作用

摘要

考虑了脉冲电流对粗晶态和超细晶态冷轧后变形退火获得的钛拉伸变形的影响。研究了大范围脉冲电流占空比对应力-应变曲线形状和机械性能的影响。结果表明，占空比的增加会导致电流热效应增强，流变应力、强度和塑性降低，以及强烈的颈缩。占空比的降低导致加热的消失和电塑性效应的发生以及强度和塑性的增加，这取决于粗晶钛的结构状态和钛的生产方法。