Fatigue Failure of a Carburized Steel Gear From a Helicopter Transmission
The failure of a spiral bevel gear from the transmission of a helicopter was discovered when the transmission was removed after an in-flight incident. Two adjacent teeth from the carburized AISI 9310 steel gear were found to have undergone fatigue failure. Internal initiation occurred in a region depleted of chromium and nickel. This condition coincides with a microstructural inhomogeneity consisting of large, soft ferrite grains. Its origin was probably contamination of the solidifying ingot during the consumable vacuum arc remelting operation.
Martin Roth, Karen Sander, 1992. "Fatigue Failure of a Carburized Steel Gear From a Helicopter Transmission", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul
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