研究了Ni-Cr-Co-Mo-W-Ta-Nb-Re-Al-Hf-C系镍基单晶高温合金在不同温度（800，980 ℃）下的低周疲劳性能。结果表明：与800 ℃下相比，980 ℃下合金的塑性变形量更大，损伤更严重，疲劳强度更低，寿命更短；2种温度下合金的疲劳断裂均为类解理断裂；800 ℃时，裂纹萌生于疏松组织处，沿{111}平面扩展，瞬断区面积较大，980 ℃时，裂纹萌生于脆性氧化皮处，沿与应力轴垂直的{001}平面扩展，瞬断区面积较小。

The low cycle fatigue properties of the Ni-Cr-Co-Mo-W-Ta-Nb-Re-Al-Hf-C series single crystal superalloy at different temperatures (800, 980℃) were studied. The results show that compared with those at 800℃, the plastic deformation of the alloy at 980℃ was greater, the damage was more serious, the fatigue strength was lower, and the life was shorter. The fatigue fractures of the alloys at two temperatures were cleavage-like fractures. At 800℃, the crack initiated at the loose microstructure and propagated along the {111} plane, and the instantaneous fracture area was relatively large. At 980℃, the crack initiated at the brittle oxide scale and propagated along the {001} plane perpendicular to the stress axis, and the instantaneous fracture area was relatively small.