摘要
The high-temperature flow behavior of TCll/Ti-22Al-25 Nb electron beam（EB） weldments was investigated by the isothermal compression tests at the temperature of 900-1060℃ and the strain rate of 0.001-10 s-（-1）.Based on the experimental data,the constitutive equation that describes the flow stress as a function of strain rate and deformation temperature is obtained.The apparent activation energy of deformation is calculated,which decreases with increasing the strain and the value is 334 kJ/mol at strain of 0.90.The efficiency of power dissipation η changes obviously with the variation of deformation conditions.Under the strain rates of 0.01,0.1 and 1 s-（-1）,the value of η increases with increasing the true strain for different deformation temperatures.While the value of η decreases with increasing the strain under the strain rates of 0.001 and 10 s-（-1）.The optimum processing condition is（t（opi）=1060℃,ε（opi）=0.1 s-（-1）） with the peak efficiency of 0.51.Under this deformation,dynamic recrystallization（DRX） is observed obviously in the microstructure of welding zone.Under the condition of 1060℃ and 0.001 s-（-1）,the deformation mechanism is dominated by dynamic recovery（DRV） and the value of η decreases sharply（η=0.02）.The flow instability is predicted to occur since the instability parameter ξ（ε）becomes negative.The hot working process can be carried out safely in the domain with the strain rate of 0.001-0.6 s-（-1） and the temperature of 900-1060℃.
在温度为900~1060℃和应变速率为0.001~10s^(-1)的条件下,通过热模拟压缩实验研究TC11/Ti-22Al-25Nb双合金电子束焊接件的高温热变形行为。结合实验数据,建立双合金热变形中流变应力随应变速率和变形温度的本构方程。同时对变形过程中的激活能进行计算和分析得出,激活能随着应变的增加而逐渐减小。在应变为0.9时激活能为334kJ/mol。变形过程中耗散率η随着变形参数的变化而变化;当应变速率为0.01、0.1和1s^(-1)时,η随应变的增加而增加;而当应变速率为0.001和10 s^(-1)时,η随应变的增加而减小。通过热加工图分析可知,最大耗散率(η=0.51)出现在1060℃和0.1 s^(-1),在此条件下,可以从焊缝区域组织中观察到明显的动态再结晶现象。而当应变速率降低时,耗散率η急剧下降,在1060℃和0.001s^(-1)的变形条件下,η降低到0.02,变形机制以动态回复为主。当失稳系数ξ(ε)为负时,材料高温变形发生失稳。分析可知,应变速率为0.001~0.6s^(-1),变形温度为900~1060℃是双合金热变形的安全区域。
基金
Project(51175431)supported by the National Natural Science Foundation of China
