论文部分内容阅读
采用Gleeble-1500热模拟机对粉末冶金TA15钛合金进行热压缩试验。基于动态材料模型建立了粉末冶金TA15钛合金在温度850～1050℃,应变速率0.001～10 s-1范围内的加工图,并结合合金变形后的微观组织对加工图进行了解释。结果表明:在T=1000℃/=0.001～0.01 s-1的区域内,功率耗散效率η值大于60%,合金可能发生了大晶超塑性变形。在T=850℃/=0.001～0.01 s-1、T=900℃/=1～10 s-1、T=950℃/=0.01～1 s-1和T=1050℃/=1～10 s-1区域内η值小于30%,其变形后的试样出现纵向开裂或有粗大的β晶粒。在T=900～950℃/=0.001～0.01 s-1、T=950～1000℃/=1～10 s-1和T=1000～1050℃/=0.01～0.1 s-1区域内为动态再结晶区,η值为30%～60%,出现动态再结晶或回复现象。
Hot compression test of powder metallurgy TA15 titanium alloy was carried out with Gleeble-1500 thermal simulator. Based on the dynamic material model, the processing diagram of TA15 powder metallurgy alloy at the temperature of 850 ~ 1050 ℃ and the strain rate of 0.001 ~ 10 s-1 was established, and the processing diagram was explained based on the microstructure after deformation. The results show that the η value of power dissipation efficiency is more than 60% in the region of T = 1000 ℃ / = 0.001 ~ 0.01 s-1, and the superplastic deformation of the alloy may occur. T = 950 ° C / = 1 to 10 s-1, T = 950 ° C / = 0.01 to 1 s-1 and T = 1050 ° C / = 1 to 10 s at T = 850 ° C / = 0.001 to 0.01 s-1 -1 area η value of less than 30%, the deformation of the sample longitudinal cracking or coarse β grains. In the region of T = 900-950 ° C / = 0.001-0.01 s-1, T = 950-1000 ° C / = 1-10 s-1 and T = 1000-1050 ° C / = 0.01-0.1 s-1, Crystalline region, η value of 30% to 60%, the phenomenon of dynamic recrystallization or recovery.