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TC4钛合金在航空航天工业中有着广泛的应用,热塑性加工中的微观组织演变对其使用性能具有重要的影响。该文通过热-力实验分析,得到TC4合金的加工图,并将加工图信息集成在有限元分析中,对板材轧制工艺进行分析。对TC4钛合金进行等温单向压缩实验获得了材料的流动应力,变形温度为800～1 050℃,应变速率为0.01～20s-1。采用动态材料模型(dynamic material model,DMM)绘制出TC4钛合金的加工图,并通过对压缩的微观组织检查分析验证了加工图的有效性。由加工图可知,在1 000～1 050℃应变速率0.01s-1的区域稳定性最好,为超塑性成形区域,在800～900℃应变速率0.1～20s-1的条件不利于塑性加工,应当避免在此区域加工。通过二次开发,将加工图的信息作为有限元程序DEFORM-2D的后处理变量在成形件中显示,从而直观地显示板材轧制变形不同位置的成形性能。在TC4轧制过程中,板坯基本处于功率耗散效率较高的安全区,有利于材料塑性成形。
TC4 titanium alloy has a wide range of applications in the aerospace industry, microstructure evolution in thermoplastic processing has an important impact on its performance. In this paper, we get the processing diagram of TC4 alloy through thermo-force experimental analysis, and integrate the processing diagram information into the finite element analysis to analyze the rolling process. The TC4 titanium alloy was subjected to isothermal uniaxial compression test to obtain the flow stress of the material. The deformation temperature was 800-10000 ℃ and the strain rate was 0.01-20s-1. The machining diagram of TC4 titanium alloy was drawn with dynamic material model (DMM), and the validity of the processing diagram was verified by the microscopic examination of the compression. It can be seen from the working drawings that the strain rate of 0.01s-1 in the range of 1 000-1 050 ° C is the best in the region of superplastic forming and the strain rate of 0.1-20s-1 at 800-900 ° C is not conducive to plastic working. Avoid processing in this area. Through secondary development, the information of the processing drawing is displayed in the forming part as the finite element program DEFORM-2D post-processing variable, so as to visually display the forming performance of different positions of the sheet rolling deformation. In TC4 rolling process, the slab is basically in a safe zone with high power dissipation efficiency, which is good for material plastic forming.