Energy

3 cases · 4 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

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Macroscopic aspect of the crack in the valve ring surface. A leakage was detected during testing after 6 months out of service and the inspection identified several transverse cracks in the forged ring. The valve was installed for one year, but it was not drained during the time it was out of service. The cracks were located in regions that were rusted and presenting a biological fouling.

50

ML00124 / Feb.2018

MIC of a Martensitic Valve Ring

M - Martensitic Stainless SteelP - ForgingAp - EnergyCd - Brittle Behavior

Cm - Aspect Before AnalysisDf - At the Surface

Aspect of the broken shear pin that was manufactured in a martensitic stainless steel forged bar, machined with the external diameter of 50mm, the internal diameter of 20mm and the shearing diameter of 25mm (shearing thickness 2.5mm). The fracture, in the right side of the figure, is not fully flat as should be expected for a shearing mechanism.

55

ML00046 / Jan.2018

Brittle Fracture of SS Shear Pin

M - Martensitic Stainless SteelP - Machined PartAp - EnergyCd - Intergranular Cracking

Cm - Aspect Before AnalysisDf - General View

Aspect of the magnetic particle result in the sample cut from the blade. The yellow scale is in mm.

76

ML00017 / Apr.2017

Casting Defect in CA6NM

M - Martensitic Stainless SteelP - Machined PartAp - EnergyCd - Casting Defect

Cm - Aspect Before AnalysisDf - Crack

More from these cases

ML00124 — MIC of a Martensitic Valve RingM - Martensitic Stainless SteelP - ForgingAp - EnergyCd - Brittle Behavior

44

ML00124 / Feb.2018

MIC of a Martensitic Valve Ring

M - Martensitic Stainless SteelP - ForgingAp - EnergyCd - Brittle Behavior

Cm - Aspect Before AnalysisDf - Localized Corrosion