摘要
采用Gleeble-1500型热模拟试验机对Ti-1300近β钛合金进行了等温恒应变速率压缩试验。变形温度范围为：920～1010℃，应变速率范围为：0．01～10s^-1，最大变形量为80％。根据试验数据建立了Ti-1300合金高温热变形行为的流变应力模型，得出该合金的变形激活能为177．59kJ／mol。结合样品的显微组织分析可知，该合金在低应变速率下发生了动态再结晶，且随着温度的升高，再结晶晶粒呈现长大的趋势；在高应变速率下以动态回复为主。结果表明，为获得细小的再结晶组织，Ti-1300钛合金宜在相变点以上50～150℃的温度范围内采用较低的变形速率进行锻造。
The hot deformation behaviors of Ti-1300 alloy in the temperature range of 920-1010℃ and strain rate range of 0.01 s^-110 s^-1 have been studied by hot compressing testing with a Gleeble-1500 simulator. A flow stress model has been build with activation energy of 177.59 according to the experimental results for the Ti-1300 alloy, which is in good agreement with the experimental results of high temperature deformation. By the metallographic analysis of Ti-1300 alloy we can know that the dynamic recrystallization is obvious at low strain rate and the dynamic recovery is obvious at high strain rate. The results indicate that the lower deformation rate should be used when the Ti-1300 alloy is forged in the temperature range of 50-150℃ above the phase transformation temperature in order to produce the fine recrystallization microstructure.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第1期46-49,共4页
Rare Metal Materials and Engineering
基金
国家"973"项目(2007CB613805)
关键词
钛合金
高温压缩
流变应力模型
变形激活能
Ti-1300 alloy
hot compression
flow stress model
activation energy
