| GUO Zhi-wei 1 ， ZHAO Zuo-peng 2 ， HU Xu-teng 2.Experimental Investigation on Small Crack Propagation Behaviors of Powder Metallurgy SuperalloyFGH4099[J].航空发动机,2025,51(1):118-123 |
| Experimental Investigation on Small Crack Propagation Behaviors of Powder Metallurgy SuperalloyFGH4099 |
| DOI： |
| Key Words:powder metallurgy alloy FGH4099 superalloy small fatigue crack crack initiation crack propagation aeroengine |
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| Abstract:To understand the correlation of small crack initiation and propagation process with stress characteristics, loading condi?
tions, and surface defects, a simulated component was designed based on FGH4099 powder turbine disk rim geometrical characteristics,
combined with its typical service temperature and load, the natural initiation small fatigue crack tests were carried out under high-
temperature conditions. The crack initiation and small crack propagation behaviors under different temperature and stress-ratio conditions
were observed and analyzed through fatigue interruption tests and surface replication techniques. The results show that the increase of test
temperature can significantly reduce the proportion of crack-initiation life of the simulated component, and has little effect on the life
proportion of fatigue crack propagating to the engineering detectable crack size. The locations of maximum principal stress and surface
inclusions are the main factors determining the crack initiation location of the simulated component. The small fatigue crack growth rate
exhibits different trends with different crack initiation mechanisms or notch radius at crack initiation locations. |
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