论文部分内容阅读
应用高温拉伸实验研究了氢对Ti-6Al-4V合金超塑变形行为的影响,借助于OM、SEM、TEM和XRD等分析手段,分析了氢对钛合金组织演变的影响.结果表明:氢可促进合金中β相数量的增加,氢质量分数达到0.2%时合金出现马氏体组织,并随着氢含量的增加而逐渐粗化;适量的氢可以改善钛合金超塑变形行为,如降低流动应力和超塑变形温度、提高应变速率敏感指数m值;Ti-6Al-4V合金加入质量分数0.1%的氢,其峰值流动应力降低53%,变形温度降低约60℃,且由于氢的加入,使得超塑变形后的位错密度减少,说明氢促进了位错的运动.
The effect of hydrogen on the superplastic deformation behavior of Ti-6Al-4V alloy was investigated by high temperature tensile test. The effect of hydrogen on the microstructure evolution of titanium alloy was analyzed by means of OM, SEM, TEM and XRD. The results showed that hydrogen Which can promote the increase of β phase in the alloy. When the mass fraction of hydrogen reaches 0.2%, the alloy appears martensite and gradually coarsens with the increase of hydrogen content. The suitable amount of hydrogen can improve the superplastic deformation behavior of titanium alloy, Flow stress and superplastic deformation temperature to increase the strain rate sensitive index m value. Ti-6Al-4V alloy with a mass fraction of 0.1% hydrogen reduces the peak flow stress by 53% and the deformation temperature by about 60 ° C, , Making the dislocation density after superplastic deformation reduced, indicating that hydrogen promotes dislocation movement.