采用Gleeble-3800型热模拟试验机，研究了Incone1690镍基合金在1000-1250℃、应变速率为0．1～10s1条件下的高温拉伸变形行为，获得了流变应力和断裂特征随变形温度和应变速率的变化规律。结果表明：该合金在高温拉伸变形中的流变应力随变形温度的升高而减小，随应变速率的增大而增大，1100-1250℃是其较佳的塑性变形区；合金的高温拉伸变形流变应力可用双曲正弦形式的本构方程来描述，其变形激活能为654．7kJ·mol^-1；随着变形温度的升高和应变速率的增大，合金的断裂机制由微孔聚集型断裂向沿晶断裂转变。
The high temperature tensile deformation behavior of Inconel 690 Ni-based alloy were studied by using Gleeble-3800 thermcrsimulation machine in the temperature range of 1 000-1 250 ℃ and strain rates of 0. 1- 10 s^-1. The variation of flow stress and fracture characteristics with deformation temperature and strain rate was obtained. The results show that the flow stress of the alloy decreased with increase of deformation temperature during high temperature tensile deformation, and increased with increase of the strain rate. The optimal plastic deformation region was 1 100-1 250 ℃. The flow stress of the alloy during tensile deformation could he described by constitutive equation in the form of hyperbolic sine, and its deformation activation energy was 654. 7 kJ · mol^-1. With increase of deformation temperature and strain rate, the fracture mechanism changed from micro-void accumulation fracture to inter-granular fracture.
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