Ti_2AlNb基合金薄壁构件热成形工艺研究

Research on hot forming process of Ti_2AlNb alloy thin-walled component

为研究Ti2ALNb基合金薄板的工程化应用,对轻质耐高温材料Ti2AlNb基合金冷轧薄板进行了冷成形、热成形和热处理实验研究,获得了该合金的热成形、热处理性能及优选的工艺参数,并进行了该合金带翻边薄壁锥筒的热成形工艺试验.结果表明:Ti2AlNb合金薄板在900℃下保温2 h后空冷可实现筒形件的热校形获得稳定外形;在不低于850℃条件下可实现带翻边焊接筒体件的热成形,并且在同一次热循环过程中可实现零件的热处理,获得尺寸精度及组织性能都能满足要求的大尺寸工程零件.

To study the engineering application of Ti2AlNb alloy, Experiments including cold crimping, hot forming and heat treatment were carried out on Ti2AlNb alloy. The heat treatment performance and optimum parameters of this alloy were obtained. Based on these researches, a Ti2AlNb cone barrel with flange was hot deformed. The results show that a cone barrel with stable outline can be hot bended under the condition of 900 ℃ × 2 h, air-cooled （ AC ） , and a cone barrel with flange can be hot formed above the temperature of 850℃. Furthermore, the heat treatment can be carried out during the second thermal cycling. The big size component with accurate dimensional accuracy and excellent microstructure and properties can be obtained.