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针对Ti-6Al-4V合金板材超塑成形能耗高、效率低的问题,提出了一种脉冲电流辅助超塑成形工艺。该工艺将成形坯料直接串联到脉冲电流回路,利用脉冲电流迅速将坯料加热至超塑成形温度。通过脉冲电流加热实验,分析了平均脉冲电流密度对坯料温度及升温速率的影响。结果表明,采用该加热方式可将坯料加热时间从数十分钟缩短至几十秒,能量消耗降至传统工艺的20%左右,极大地提高了加热效率、降低了能耗,实现了节能环保的绿色超塑成形技术。利用该工艺成形了Ti-6Al-4V合金双半球结构,并分析了在脉冲电流辅助工艺条件下细晶态Ti-6Al-4V合金的超塑变形机制。
Aiming at the problem of high energy consumption and low efficiency of superplastic forming Ti-6Al-4V alloy plate, a pulsed current-assisted superplastic forming process was proposed. The process will be directly connected to the forming blank pulse current loop, the use of pulse current quickly heated blank to superplastic forming temperature. Through the pulse current heating experiment, the influence of average pulse current density on billet temperature and heating rate was analyzed. The results show that the heating time can be used to shorten the heating time of the blank from tens of minutes to tens of seconds, and the energy consumption is reduced to about 20% of the traditional process, thereby greatly improving the heating efficiency, reducing the energy consumption, and achieving energy saving and environmental protection Green superplastic forming technology. The double hemispherical structure of Ti-6Al-4V alloy was formed by this process, and the superplastic deformation mechanism of fine crystalline Ti-6Al-4V alloy under pulsed current-assisted process was analyzed.