钛铝复合板热加工图及热轧实验

Hot Processing Map and Hot Rolling Experiment of Ti-Al Clad Plate

摘要:

采用Gleeble-3500热模拟试验机进行高温等温压缩实验，研究了爆炸焊接钛铝复合板在变形温度为300~500 ℃、应变速率为0.1~10 s^-1条件下的热变形行为，利用动态材料模型构建了钛铝复合板热加工图，并基于热加工图进行了钛铝复合板热轧工艺验证实验。结果表明：钛铝复合板属于正应变速率敏感材料；在热加工图中变形温度为420~460 ℃、应变速率为1.6~6.3 s^-1时，功率耗散效率达到0.64~0.72，该区域对应的工艺参数适合进行钛铝复合板热轧；热轧后实验板材界面结合良好，具有良好的力学性能和钣金成形性能。钛铝复合板在热轧过程中的变形机制为：变形抗力低、流动快的铝层在自身发生塑性变形的同时牵引着钛层一起发生塑性变形，其中铝层是热变形，钛层为冷变形。

Abstract:

The hot deformation behavior of explosive welded titanium-aluminum (Ti-Al) clad plate was studied by isothermal compression tests at 300~500 °C with strain rates of 0.1~10 s^-1 on Gleeble 3500 simulated machine. The hot processing map was developed on the basis of experimental data using the principles of dynamic materials model, and the verification experiment of hot rolling process of Ti-Al clad plate was carried out based on the hot processing map. The results show that Ti-Al clad plate is a kind of positive strain rate sensitive material. The efficiency of power dissipation of 0.64~0.72 can be observed at 420~460 °C with strain rate of 1.6~6.3 s^-1 in the hot processing map, and the process parameters of this region are suitable for the hot rolling of Ti-Al clad plate. After hot rolling, the interfaces of the Ti-Al clad plates are well bonded, and the plates have excellent mechanical property and good sheet metal forming property. The deformation mechanism of Ti-Al clad plate in the hot rolling process is as follows: the Al layer with low deformation resistance and fast flow can produce plastic deformation, and at the same time it can pull the Ti layer together to produce plastic deformation; in this process, the Al layer is hot deformation while the Ti layer is cold deformation.