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在Thermecmaster-Z型热模拟实验机上对铸态TB6钛合金在800~1150℃、0.001~10 s-1变形参数范围内进行了等温恒应变速率压缩实验,根据实验数据采用基于Murty准则的加工图技术对该合金的锻造工艺进行了优化,并结合显微组织观察研究了该合金的变形机制。结果表明,在低温区的较佳变形参数为800~950℃、0.001~0.01 s-1,其变形机制为大晶粒超塑性;在高温区的较佳变形参数为1020~1080℃、0.001~0.006 s-1,其变形机制为动态再结晶。失稳区出现在800~890℃、0.01~10 s-1的低温区和975~1120℃、3.162~10 s-1的高温区域,在流变失稳区会出现晶界裂纹。
The isothermal constant strain rate compression experiment was carried out on the Thermecmaster-Z thermal simulation machine at 800 ~ 1150 ℃ and 0.001 ~ 10 s-1 for the as-cast TB6 titanium alloy. According to the experimental data, Technology for the alloy forging process was optimized, combined with microstructure observation of the deformation mechanism of the alloy. The results show that the optimum deformation parameters are 800-950 ℃ and 0.001-0.01 s-1 in the low temperature region, and the deformation mechanism is large-grain superplasticity. The optimum deformation parameters are 1020 ~ 1080 ℃ and 0.001 ~ 0.006 s-1, the deformation mechanism is dynamic recrystallization. The instability zone appeared in the low temperature range of 800 ~ 890 ℃, 0.01 ~ 10 s-1 and the high temperature range of 916 ~ 1120 ℃ and 3.162 ~ 10 s-1, and the grain boundary crack appeared in the rheological instability zone.