Damage

1 case · 1 image

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Replication Technique Detail focus: Pitting clear all

Damage — sub-branches

Brittle Behavior 12Corrosion 39Ductile Behavior 5Fabrication Defect 20Fatigue 12High Temperature 9Hydrogen 17Lack of Sealing 1Repair Defect 1Shooting Effect 4Wear 3

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The micrographic aspect of the corroded surface, after polishing and etching with Kalling, shows the margin of one pit and microcracks propagating through previous austenite grain boundaries of the martensitic structure, probably associated to the biological attack and material embrittlement. Replication technique.
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ML00092 / Sep.2017
MIC of a Valve Body
M - Martensitic Stainless SteelP - Valve BodyAp - Oil and GasCd - Brittle Behavior
Cm - Kalling etched, OMDf - Pitting