A

5 cases · 8 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Fracture Surface Aspect clear all

A — sub-branches

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After cutting the pipe and opening the crack, the fracture appearance shows a clean fracture, flat, starting from the margem of the weld of the pipe (right side of the figure), and propagating through wall into the pipe (aproximately 5 mm thickness). The external side of the pipe is to the right side of the figure (presenting the weld finishing) and the internal side of the pipe is to the left side of the figure.
176
VIEW
ML00150 / Dec.2018
Vibration Induced Fatigue in a SS Oil Piping
M - Duplex Stainless SteelP - PipingAp - FPSOCd - Vibration Induced Fatigue
Cm - Fracture Surface AspectDf - Fracture
The fracture is flat, in the region of the lower resistant section, presenting no macroscopic evidences of plastic deformation. The starting point of the fracture is indicated by the chevron marks.
62
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Fracture Surface AspectDf - Chevron Marks
Fractured position of the casting cylinder of 10.5 mm thickness (minimum measured thickness) showing a brittle behavior (lack of plastic deformation), typical of overloading a material with 1% ductility (measured in the tensile test). This is the view of the internal surface of the cylinder, presenting regions of localized thinning in this surface that was in contact with (treated) cooling water. The external side of the cylinder was painted.
918
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fracture Surface AspectDf - General View
Aspect of the fracture surface after cutting the valve body and opening the crack. The fracture is brittle.
55
VIEW
ML00134 / Aug.2020
Brittle Fracture of a Superduplex Valve Body
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Brittle Fracture
Cm - Fracture Surface AspectDf - Brittle Fracture
Aspect of the all weld metal broken tensile test conducted in the sample removed from structure close to the region where the cracking was detected, indicating that the material entrapped hydrogen for several days, since the test was conducted more than 2 weeks later than the cracking was detected.
61
VIEW
ML00010 / Oct.2017
Cold Cracks in a Gouged Weld Metal
M - Low Alloy Low Carbon QTP - Rolled PlateAp - OffshoreCd - Welding Defect
Cm - Fracture Surface AspectDf - Fish Eye

More from these cases

ML00148 — Brittle Fracture of a 420 SS Barrel NutM - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Macroscopically brittle fracture of the barrel nut, starting at the edge of the thread, as shown by the chevron marks.
29
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Fracture Surface AspectDf - Chevron Marks
ML00141 — Brittle Fracture of a Corroded Gray Cast IronM - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Fracture aspect of the casting cylinder at the 10.5 mm thickness, showing a brittle behavior (lack of plastic deformation). The internal side of the cylinder is to the top of the figure, and the painted surface is to the bottom of the figure.
129
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fracture Surface AspectDf - Brittle Fracture
Detailed aspect of the cylinder fracture, the internal surface to the top of the figure and the painted external surface to the bottom of the figure.
103
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fracture Surface AspectDf - Brittle Fracture