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采用Gleeb-3500热模拟实验机,对再结晶态TZM(Mo-0.39Ti-0.093Zr-0.017C)合金的热变形特征进行了研究。试样用粉末冶金的方法制备,经过70%变形量的高温锻造,然后分别在1100,1200,1300,1400,1500和1600℃的温度下退火,观察了TZM合金的再结晶过程。热模拟实验在1200℃的温度下进行,应变速率为0.1 s-1,变形量为30%,得到了压缩过程的真应力-应变曲线。研究结果表明,TZM合金的硬度随着退火温度的升高而显著降低,且下降的速率为0.13(HV/℃),1600℃退火后,晶粒已经充分长大,再结晶完成,TZM合金明显变软;完全再结晶后的TZM合金在1200℃下热压缩变形,当应变量小于5%时,应力随着应变的增加而迅速增加,加工硬化现象明显;当应变量大于5%时,应力随着应变的增加而缓慢增加,加工硬化速率降低。
The thermal deformation characteristics of recrystallized TZM (Mo-0.39Ti-0.093Zr-0.017C) alloy were investigated by Gleeb-3500 thermal simulation machine. The samples were prepared by powder metallurgy method, subjected to high temperature forging of 70% deformation, then annealed at 1100, 1200, 1300, 1400, 1500 and 1600 ℃ respectively. The recrystallization of TZM alloy was observed. The thermal simulation experiment was carried out at a temperature of 1200 ℃ with a strain rate of 0.1 s-1 and a deformation of 30%. The true stress-strain curve of the compression process was obtained. The results show that the hardness of TZM alloy decreases remarkably with the increase of annealing temperature, and the rate of decrease is 0.13 (HV / ℃). After annealing at 1600 ℃, the grains grow up sufficiently, recrystallization is completed and TZM alloy is obviously When the amount of strain is less than 5%, the stress increases rapidly with the increase of strain and the work hardening phenomenon is obvious. When the amount of strain is more than 5%, the stress As the strain increases slowly and the work hardening rate decreases.