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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Condition: Hydrogen Microstructure: Carburized Layer Capture method: Naked Eye or Stereoscope clear all

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Macrography of the longitudinal section of the 2" diameter pin close to the fracture surface (top of the figure) in a section where the pin presented the final fracture (it is deformed). The lubrication hole is in the right side of the figure. It is possible to see several secondary cracks at the surface of the pin (left side of the figure), propagating only where there is a carburized layer. It is possible to see that the end of each secondary crack is blunted.
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ML00081 / Aug.2017
Hydrogen Cracking of a Chromium Plated Carburized Pin
M - Low Alloy for Thermochemical TreatmentP - Chromium PlatedAp - AutomotiveCd - Hydrogen Embrittlement
Cm - NItal Etched MacroDf - Carburized Layer