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任书杰,王克鲁.Ti-22Al-24Nb合金热成形工艺参数优化研究[J].稀有金属材料与工程(英文),2018,47(9):2793~2799.[renshujie and Wang Kelu.Study of hot forming parameters optimization for Ti-22Al-24Nb alloy[J].Rare Metal Materials and Engineering,2018,47(9):2793~2799.]
Study of hot forming parameters optimization for Ti-22Al-24Nb alloy
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Received:May 11, 2017  Revised:June 06, 2017
Key words: Ti-22Al-24Nb alloy  hot forming parameters  hot deformation activation energy  processing map
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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renshujie and Wang Kelu  
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      Hot deformation behavior of Ti-22Al-24Nb alloy was investigated in the temperature range of 900~1110 ℃ and strain rate range of 0.01~10 s-1 employing Gleeble-3500 thermo-mechanical simulator. Characteristics of flow stress curve at elevated temperature and hot deformation activation energy in different phase regions were analyzed, and hot forming parameters of the alloy were optimized by processing maps under instability criterion of Prasad and Murty and corresponding organizational characteristics. The results show that the flow stress of the alloy is sensitive to the hot forming parameters. By the calculation of Arrhenius power function equation, the deformation activation of the alloy is 406.25 kJ/mol in B2 single-phase region that can be a large difference between with (α2+B2) two-phase region(603.56 kJ/mol), which indicates that there may be different deformation mechanisms between different phases regions. According to the comparison of two kinds of processing maps and the microstructure observation, processing map of the alloy based on the Prasad instability criterion is more reasonable. The corresponding main instability zones are 900~990 ℃、0.2~10 s-1 and 1035~1095 ℃、1~10 s-1, and the adiabatic shear bands and the local plastic instability in the microstructure were predicted by the instability zones. However, the dynamic recrystallization and the microstructure of the cellular substructure are easy to appear in the η peak regions, indicating that the better thermodynamic parameter range are 990~1035 ℃、0.01~0.03 s-1, 1040~1090 ℃、0.02~1 s-1 and 1090~1110 ℃、0.01~0.18 s-1.