Incoloy901合金的热加工图与热变形行为

利用Gleeble-3800热模拟机研究Incoloy901高温合金在变形温度950～1150℃,应变速率0.005～1 s^-1,真应变0.6下的热变形行为。结果表明:变形温度大于1000℃,应变速率大于0.01 s^-1时,Incoloy901合金真应力-应变曲线呈现动态再结晶特征。根据应力-应变曲线构建Incoloy901合金的本构方程与热加工图,得出形变激活能Q=439.401 k J/mol,最佳热加工工艺为:变形温度1050～1150℃,应变速率0.005～0.1 s^-1,在此工艺范围内合金的高温变形功率耗散系数η较高,可达37%,能获得较好的动态再结晶组织。

High temperature deformation behavior and processing map of Incoloy901 alloy

Hot deformation behavior of Incoloy901 alloy at deformation temperature between 950-1150 C,strain rate between 0.005-1 s and true strain of 0.6 was studied with Gleeble-3800 thermal simulator machine.The results show that the true stress-strain curve of Incoloy901 alloy presents dynamic recrystallization characteristics when the deformation temperature is higher than 1000 C and the strain rate is greater than0.01 s.According to the stress-strain curve,the constitutive equation and hot working diagram of Incoloy901 alloy are constructed,and the deformation activation energy Q=439.401 kJ/mol is obtained.The optimal hot work ing process consists of deformation at temperature of 1050-1 150 C with strain rate between 0.005-0.1 s-1.Within this process range,the high temperature deformation power dissipation cofficient (η) of the alloy is higher,up to 37%,and better dynamic recrystallization structure can be obtained.