在Gleeble-1500热模拟机上对Ni76Cr19AlTi合金棒材进行 恒温和恒速压缩变形实验, 变形温度范围为800-1150 ℃, 应变速率范围 为10 -3 - 10 0 s -1. 结果表明, 实验合金在800和850 ℃ 热压缩时变形抗力较大, 容易发生开裂; 而在950-1150 ℃温度范围内热 变形由于发生动态再结晶, 合金变形抗力减小, 变形容易进行, 不会发生 开裂. 研究了合金在高温塑性变形过程中流变应力的变化规律, 确定了合 金在950-1150 ℃范围内的变形激活能Q为376.84 kJ/mol, 应力指数n 为4.15. 对合金的热压缩变形真应力-真应变曲线及变形机制的分析表明, 合理的变形条件为1050-1150 ℃及10 -1 - 10 0 s -1.
The hot deformation behavior of Ni76Cr19AlTi alloy was studied by compression test of cylindrical specimen at constant temperature and constant strain rate in a Gleeble-1500 system. The deformation temperature ranges from 800 ℃ to 1150 ℃, strain rate from 10 -3 s -1 to 1 s -1. The results show that Ni76Cr19AlTi alloy has a large deformed resistance and is easily fractured when deformed at 800℃ and 850℃. But when compressing at a temperature range of 950--1150℃, the resistance to deformation reduces and the alloy doesn't fracture because of dynamic crystallization. The measurement of the flow stress of the alloy in high temperature range of 950-1150 ℃ showed that the thermal deformation activation energy Q is 376.84 kJ/mol and stress exponent n is 4.15. By analyzing the true stress-strain curves for the alloy at hot compression and its deformation mechanism, the suitable deformation condition is at the temperature range from 1050 ℃ to 1150 ℃ with strain rate from 10 -1 s -1 to 10 0 s -1.
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