Creep-Fatigue Interaction Behavior of Powder Metallurgy Nickel-Based Superalloy FGH96
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摘要: 对国产粉末冶金FGH96镍基高温合金在650℃总应变控制下进行了无保载疲劳试验以及最大拉/压应变保载蠕变-疲劳试验，研究了其失效寿命及失效模式，并与铸造GH4169镍基高温合金的失效寿命进行了对比。结果表明：保载的引入降低了FGH96高温合金的失效寿命，与最大拉应变保载相比，最大压应变保载时产生的蠕变损伤更大，失效寿命更短；FGH96高温合金的疲劳失效寿命基本上高于GH4169高温合金的，但是较高应变幅下（大于1.4%）的蠕变-疲劳失效寿命低于GH4169高温合金的，在较低应变幅下（小于1.4%）则相反；FGH96高温合金的疲劳断口和蠕变-疲劳断口均呈现出表面或近表面多裂纹源失效特征。Abstract: Fatigue test without load-holding and creep-fatigue tests with load-holding at maximum tension/compression strains were conducted on domestic powder metallurgy nickel-based superalloy FGH96 under total strain control at 650℃. The failure life and failure mode of the alloy were studied, and the failure life was compared with that of as-cast nickel-based superalloy GH4169. The results show that the introduced load-holding process reduced the failure life of the FGH96 superalloy. Compared with load-holding at maximum tension strain, the creep damage produced during load-holding at the maximum compression strain was larger, resulting in a shorter failure life. The fatigue failure lives of FGH96 superalloy were higher than those of GH4169 superalloy, and the creep-fatigue failure lives were lower than those of GH4169 superalloy at relatively high strain amplitude (larger than 1.4%), while the opposite was true at relatively low strain amplitude (lower than 1.4%). The fatigue fracture and creep-fatigue fracture of FGH96 superalloy both showed mutiple crack initiation failure characteristics on surface or near surface.
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Keywords:
- creep-fatigue /
- loading waveform /
- powder metallurgy alloy /
- fracture characteristic
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