Damage

8 cases · 51 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Ferritic pearlitic Capture method: Scanning Electron Microscope clear all

Damage — sub-branches

Brittle Behavior 1Corrosion 6Ductile Behavior 1Fabrication Defect 7Fatigue 3Shooting Effect 1Wear 1

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Fracture surface aspect at the scanning electron microscopy (SEM) of the clamp OD, showing different planes of propagation of the fracture.
42
VIEW
ML00171 / Feb.2021
Corrosion Fatigue of U Bolt Pipe Clamp
M - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Cm - Fractography by SEMDf - Fracture
Micrographic detail, by scanning electron micrography, of the pitting corrosion generating cracks, typical of a corrosion fatigue mechanism.
156
VIEW
ML00163 / Jun.2020
Corrosion Fatigue of a Boiler Waterwall Tube
M - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Cm - Nital Etched Micrography by SEMDf - Pitting
Micrography of the plate section, in the middle of the plate in a position where the projectile did not affect. Ferritic-pearlitic structure.
55
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by SEMDf - Ferrite and Pearlite
The fracture surface of the casting cylinder presented, at the internal surface, interconnected graphite flakes and a corroded matrix.
73
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fractography by SEMDf - Close to the Internal Surface
Micrography of the seam welded joint, autogenous. The localized dissolution occurrs exactly at the weld metal that presents a bainitic structure and Vickers (100g) microhardness values about 230HV, compared to the heat affected zone presenting average of 202 HV and the base metal presenting average of 180HV.
59
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Nital Etched Micrography by SEMDf - Welded Joint
Scanning electron microscopy image of the chromium plated cylinder surface, presenting deposits and localized dissolution under deposits. There are different stages of corrosion in this region, observed in low magnification. Small areas of attack and a shallow pitting with deposits that were analyzed by EDS and revealed the presence of S.
903
VIEW
ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Surface Aspect by SEMDf - Localized Corrosion
Micrographic detail of the bainitic structure at the HAZ of the carbon steel plate, by scanning electron microscopy.
40
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Heat Affected Zone
Micrography of a transverse section of the shell plate in a cracked position showing the transgranular morphology of the stress corrosion cracks.
167
VIEW
ML00019 / Apr.2017
Transgranular SCC in Boiler Steam Drum
M - CMn SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Cm - Nital Etched Micrography by SEMDf - Transgranular Cracking

More from these cases

ML00171 — Corrosion Fatigue of U Bolt Pipe ClampM - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Detail by scanning electron microscop of the clamp surface showing several cracks, parallel. In this image the cracks appear horizontal, but the photo was taken with the axis of the clamp in the vertical direction which means that the cracks are transverse to the axis.
41
VIEW
ML00171 / Feb.2021
Corrosion Fatigue of U Bolt Pipe Clamp
M - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Cm - Surface Aspect by SEMDf - Multiple cracks
Detailed aspect of the previous figure showing the parallel cracks, transverse to the axis.
37
VIEW
ML00171 / Feb.2021
Corrosion Fatigue of U Bolt Pipe Clamp
M - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Cm - Surface Aspect by SEMDf - Multiple cracks
Detail by scanning electron microscopy of the pits in the metallographic longitudinal section of the clamp, at the surface (left side of the image). There are cracks emanating from the pits.
27
VIEW
ML00171 / Feb.2021
Corrosion Fatigue of U Bolt Pipe Clamp
M - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Cm - Nital Etched Micrography by SEMDf - Crack
Detail by scanning electron microscopy of the cracks emanating from the pits in the metallographic longitudinal section of the clamp, at the surface (left side of the image).
25
VIEW
ML00171 / Feb.2021
Corrosion Fatigue of U Bolt Pipe Clamp
M - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Cm - Micrography by SEMDf - Crack
Metallographic aspect by scanning electron microscopy of one secondary cracking, paralell to the fracture surface, growthing with an irregular path and transgranular morphologyy.
28
VIEW
ML00171 / Feb.2021
Corrosion Fatigue of U Bolt Pipe Clamp
M - Low Carbon SteelP - BoltAp - ShipCd - Corrosion Fatigue
Cm - Micrography by SEMDf - Corrosion Cracking

+3 more from this case →

ML00163 — Corrosion Fatigue of a Boiler Waterwall TubeM - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Micrographic detail, by scanning electron microscopy, of the external tube surface, presenting the crack at the weld margin. The microstructure if ferritic in the left side (weld metal) and bainitic in the right side of the crack (heat affected zone).
90
VIEW
ML00163 / Jun.2020
Corrosion Fatigue of a Boiler Waterwall Tube
M - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Cm - Nital Etched Micrography by SEMDf - Cracking
Corrosion Fatigue of a Boiler Waterwall Tube
4
VIEW
ML00163 / Jun.2020
Corrosion Fatigue of a Boiler Waterwall Tube
M - Low Carbon SteelP - Seamless tubeAp - BoilerCd - Corrosion Fatigue
Cm - Nital Etched Micrography by SEMDf - Pearlite
ML00143 — Impact of a .308 Winchester on A36 PlateM - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Micrographic detail of the plate section, evidencing the non affected ferritic-pearlitic structure.
57
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by SEMDf - Ferrite and Pearlite
Detail of the margin of the perforated hole in the impact position. It is interesting to observe extreme plastic deformation created by the perforation expulsing the material from the hole, in the direction of the impact.
42
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Surface Aspect by SEMDf - Plastic Deformation
Margin of the perforated hole showing regions of fracture and a smooth appearance in the hole surface (right side of the figure). This smooth aspect was generated by the film of melted material from the bullet.
44
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Fractography by SEMDf - Ductile Fracture
The fracture created by the projectile impact is fully ductile. The material presented a sheared surface with elongated dimples.
45
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Fractography by SEMDf - Dimples
Fractographic detail of the ductile fracture generated by the projectile impact. The material presented a sheared surface with elongated dimples.
41
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Fractography by SEMDf - Dimples

+11 more from this case →

ML00141 — Brittle Fracture of a Corroded Gray Cast IronM - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
The fracture surface of the casting cylinder presented, in the center of the thickness, cleavage facets and graphite decohesion that corresponds to a brittle fracture of the material.
61
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fractography by SEMDf - In the Center of the Thickness
The fracture surface of the casting cylinder presented, close to the external surface, a more ductile aspect of the fracture.
58
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fractography by SEMDf - Close to the External Surface
Fractographic detail of the interconnected graphite flakes and corroded matrix.
50
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fractography by SEMDf - Corrosion
Fractographic detail of the graphite decohesion and cleavage facets in the center of the cast cylinder thickness.
47
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Fractography by SEMDf - Brittle Fracture
Micrography of the longitudinal section of the cylinder, at the external diameter (right side of the figure), presenting smaller interdendritic graphite flakes in a ferritic-perlitic matrix. This surface is painted.
32
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Nital Etched Micrography by SEMDf - Graphite in Flakes
ML00140 — Preferential Corrosion of Pipe Seam WeldM - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Micrography at the scanning electron microscopy showing the deposits inside the crevice. The microanalysis by EDS revealed the presence of Fe, O, as well as Cl and S.
35
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Micrography by SEMDf - Corrosion
ML00128 — MIC of a Stored Hydraulic CylinderM - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Scanning electron microscopy image of the chromium plated surface in a position where the cylinder was not damaged, showing the surface finishing.
35
VIEW
ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Surface Aspect by SEMDf - At the Surface
Scanning electron microscopy image of the chromium plated cylinder in a region of localized dissolution under deposit. Inside the shallow pitting the Cr structure with a network of layers is revealed by the etching effect promoted by microbiollogically induced corrosion.
35
VIEW
ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Surface Aspect by SEMDf - Corrosion
Scanning electron microscopy image in detail of the chromium plated cylinder surface in a region of localized dissolution. The surface shows several microcracks promoted by the effects of the microbiollogically induced corrosion. Inside the corroded pit the network of the chromium layer is evidenced by the MIC attack.
48
VIEW
ML00128 / Apr.2018
MIC of a Stored Hydraulic Cylinder
M - Low Carbon SteelP - Chromium PlatedAp - OffshoreCd - Localized Dissolution
Cm - Surface Aspect by SEMDf - Corrosion
ML00052 — Cold Cracks in API 5CT L80 Tube Welded to a Structural PartM - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Micrographic detail of the ferritic structure in the weld metal close to the low alloy steel tube, by scanning electron microscopy. The weld metal presents a typical aspect for high strenght weld metal (100% acicular ferrite).
32
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Weld Metal
Micrographic detail of the fusion line of the carbon steel plate, by scanning electron microscopy, showing the bainitic structure at the HAZ and ferritic structure in the weld metal.
34
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Fusion Line
Micrographic detail of the ferritic structure in the weld metal close to the carbon steel plate, by scanning electron microscopy. The weld metal presents a typical aspect for low strenght weld metal (grain boundary and primary ferrite, plus acicular ferrite).
30
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Weld Metal
Micrographic detail of the fusion line of the low alloy steel tube, by scanning electron microscopy, showing the martensitic structure at the HAZ and acicular ferritic structure in the weld metal.
29
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Fusion Line
Micrographic detail of the martensitic structure at the HAZ of the low alloy steel tube, by scanning electron microscopy.
40
VIEW
ML00052 / Apr.2017
Cold Cracks in API 5CT L80 Tube Welded to a Structural Part
M - Low Alloy SteelP - Seamless tubeAp - OffshoreCd - Welding Defect
Cm - Surface Aspect by SEMDf - Heat Affected Zone

+2 more from this case →

ML00019 — Transgranular SCC in Boiler Steam DrumM - CMn SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Micrographic detail of the transgranular stress corrosion cracking.
69
VIEW
ML00019 / Apr.2017
Transgranular SCC in Boiler Steam Drum
M - CMn SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Cm - Nital Etched Micrography by SEMDf - Transgranular Crack