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Abstract

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.

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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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