(钢铁研究总院 北京100081)
摘 要: 在α2+B2相区制作Ti-23Al-17Nb合金饼材，观察饼材纵断面不同区域的微观组织。对沿径向截取的拉伸试样进行不同固溶温度＋850 ℃、16 h、AC时效处理，测试其拉伸性能。对最佳热处理制度处理试样进行不同温度拉伸性能，600 ℃和650 ℃持久性能和650 ℃，100 h热暴露的稳定性等进行测试。结果表明：采用该工艺制作的饼材的组织比自由锻饼材的组织更均匀；经(1 040 ℃，2 h，AC)+(850 ℃，16 h，AC)热处理后，饼材的综合性能良好，可作为航空和航天等领域的备选用材。
关键字: Ti-23Al-17Nb；饼材；组织；性能
（Central Iron and Steel Research Institute, Beijing 100081, China）
Abstract:A Ti-23Al-17Nb alloy forging disk was made in α2+B2 phase field. The microstructures of different zones in vertical section disk were observed. The tensile samples cut along the radial direction in the disk were heat treated at different solution temperatures, then aged at 850 ℃, 16 h, AC. The tensile properties were evaluated. Fixed one optimum heat treatment for the samples, the tensile properties at different test temperatures, stress-rupture properties at 600 ℃ and 650 ℃ and thermal stabilities at 650 ℃, 100 h were evaluated. The results show that the microstructure of disk prepared by this forging process is more homogeneous than that of general open forging. The tensile samples with heat treatment of 1 040 ℃, 2 h, AC+850 ℃, 16 h, AC show good combination of strength and ductility. This alloy is good candidate material for aeronautic and astronautic industry.
Key words: Ti-23Al-25Nb alloy; disk; microstructure; property
