钛合金TC4材料热处理工艺对圆筒在内爆炸载荷下膨胀半径的影响

Influence of cylinder expansible radius under internal explosive loadingby heat-treated technology of Ti-6Al-4V alloy

对采用两种不同热处理工艺的钛合金TC4材料进行了Hopkinson拉伸实验、圆筒爆炸实验和数值仿真,从而确定了两种不同热处理工艺的优劣并通过微观分析揭示了钛合金TC4材料微观组织结构对内爆炸载荷下圆筒膨胀半径的影响。实验和数值分析表明:采用双重退火热处理工艺的钛合金TC4材料具有良好的动态力学性能。在相同的加载条件下,经此工艺处理的TC4圆筒在爆轰产物未泄漏之前有着充分的膨胀半径,而且也不容易形成绝热剪切破坏。同时,给出的依据高速摄影照片确定筒壳断裂点的方法是切实可行的,获得的断裂时间与数值分析结果吻合。

After two kinds of different heat-treated technologies are applied to Ti-6Al-4V alloy, the Hopkinson tension experiment, cylinder explosive test and numerical simulation are conducted in this paper. Consequently, the differences between two hot-workings are determined and the influence of microstructure of Ti-6Al-4V alloy on the expansive radius of cylinder under internal explosive loading is revealed by microscopic analysis. The experiment and numerical calculation show that excellent mechanical properties of Ti-6Al-4V alloy have been acquired by double annealing heat treatment technology. Under identical loading conditions, the double annealing hot-working gives the cylinder abundant expanding radius before leaking out of detonation products and the damage of adiabatic shear can not be formed so easily. Meanwhile, the method of determining rupture point of the cylindrical shell is practicable by high speed scanning records and the obtained fracture time is consistent with the numerical calculation results.