Damage

120 cases · 1069 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Damage — sub-branches

Aged Microstructure 2Branched Cracks 12Brittle Cracks 16Brittle Fracture 50Casting defects 4Chevron Marks 4Cleavage Facets 13Corroded Thread 3Corrosion 56Corrosion Cracking 20Crack 46Cracking 41Cracks 69Cracks Transverse to the Surface 7Dezincification 7Dimples 13Ductile Crack 23Ductile Fracture 21Elongated Dimples 5Fatigue Crack 26Fatigue Fracture 17Fatigue Striation 16Fish Eye 1Fracture 114Hard Spots 4Hydride Formation 5Interconnected Cracks 1Intergranular Corrosion 10Intergranular Cracking 60Intergranular Fracture 26Lap 3Layer Detachment 9Leakage 11Localized Corrosion 36Localized Deposits 1Localized Thinning 10Margin of the Weld Crack 3Melted film 18Metal to Metal Wear 2Microcracks 9Multiple cracks 19Non Hardened Surface 4Oxide Layer 6Painting Detachment 1Parallel cracks 2Pitting 30Plastic Deformation 68Pore 1Preferential Dissolution 10Scale 3Seam 1Secondary Cracks 46Segregated Regions 7Spalling 1Stress Corrosion Cracks 8Surface Deposits 3Thermal Fatigue Cracks 7Thick-edged rupture 1Thinning 5Through Wall Cracking 14Transgranular Cracking 17Transgranular Fracture 13Void 4Voids 3Washout 1

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The painting of the valve body was detaching at the vent location where the fitting was installed, not fully tighted. Three threaded fillets were outside of the body.
190
VIEW
ML00184 / Apr.2023
Dissimilar Steels in a Threaded Connection
M - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
Cm - Aspect After CleaningDf - Painting Detachment
Detail of the fracture in the WHEEL 1, changing direction of propagation.
71
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Aspect Before AnalysisDf - Fracture
Detail of the flat fracture from the notch at the bottom of the recess. No plastic deformation.
113
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Brittle Fracture
Detail of a sound teeth, showing marks of plastic deformation across the tooth surface.
53
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface AspectDf - Plastic Deformation
Detail of the perforation point, internal view. Aligned perforations in the overheated region and interconnected longitudinal cracks.
94
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - Longitudinal Section AspectDf - Leakage
Detail of the through wall cracking that caused the leakage in the 2" pipe. The crack was originated in the fillet weld, from the end of the reinforced rib.
72
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Aspect Before AnalysisDf - Fatigue Crack
The dye check image shows the detected crack, 50 mm long, at the margin of the weld in the forging side.
137
VIEW
ML00178 / Jan.2022
Cold cracks in Cr-Mo Welded Forging
M - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
Cm - Aspect by NDTDf - Cracking
Macrography of the longitudinally seam weld of the 24" diameter tube, showing that it was welded from both sides and there is a segregation line in the center of the tube thickness.
737
VIEW
ML00177 / Dec.2021
Cr-Mo Seam Welded Tube
M - CrMo SteelP - Longitudinally Seam WeldedAp - Fired HeaterCd - Not according to spec
Cm - NItal Etched MacroDf - Seam

More from these cases

ML00184 — Dissimilar Steels in a Threaded ConnectionM - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
The austenitic stainless steel fitting was removed from the valve body and presented the sdhesion of oily deposits.
150
VIEW
ML00184 / Apr.2023
Dissimilar Steels in a Threaded Connection
M - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
Cm - Aspect Before AnalysisDf - Surface Deposits
The threads of the carbon steel valve body is corroded. The offshore ambient is wet and chloride rich, creating an aggressive environment for the carbon steel threads.
99
VIEW
ML00184 / Apr.2023
Dissimilar Steels in a Threaded Connection
M - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
Cm - Surface AspectDf - Corrosion
Not only the threads were corroded but all regions under the painting that was detached from the surface.
86
VIEW
ML00184 / Apr.2023
Dissimilar Steels in a Threaded Connection
M - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
Cm - Surface AspectDf - Corrosion
Macrosection of the valve body at the thread, showing the position where the fitting was installed.
84
VIEW
ML00184 / Apr.2023
Dissimilar Steels in a Threaded Connection
M - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
Cm - Transverse Section AspectDf - Corrosion
Macrosection detail of the valve body at the thread, showing the metal to metal contact between the carbon steel female thread and the stainless steel male thread.
80
VIEW
ML00184 / Apr.2023
Dissimilar Steels in a Threaded Connection
M - Low Carbon SteelP - ForgingAp - OffshoreCd - Localized Dissolution
Cm - Transverse Section AspectDf - Localized Corrosion

+4 more from this case →

ML00183 — Ductile Behavior of an Aluminum WheelM - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Detail of the crack in the WHEEL 2, changing direction of propagation exactly like the other whel.
66
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Aspect Before AnalysisDf - Cracking
WHEEL 1 fracture detail showing a small shrinkage in the left side of the photo and dimples in the right side of the photo.
73
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Fractography by SEMDf - Ductile Fracture
WHEEL 1 fracture detail showing predominantly dimples as the fracture micromechanism.
74
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Fracture Surface AspectDf - Ductile Fracture
WHEEL 1 fracture detail showing small regions of shearing.
67
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Fractography by SEMDf - Elongated Dimples
WHEEL 1 fracture detail showing small regions with smooth aspect, and brittle microcracks. But predominantly the micromechanism is by dimples.
70
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Fractography by SEMDf - Cracks

+15 more from this case →

ML00182 — Brittle Fracture of a LAS Fixing RodM - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Micrography presenting segregation bands (less etched) in a tempered martensitic microstructure.
81
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Segregated Regions
Micrographic detail of the segregated bands.
61
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Micro by OM, picric acid+FeCl3+H2O etchDf - Segregated Regions
Micrographic etch for revealing previous austenite grain boundaries, that shows the impurities.
54
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Micro by OM, picric acid+FeCl3+H2O etchDf - Segregated Regions
Flat fracture, no plastic deformation, at the notch in the recess.
63
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Brittle Fracture
Fractographic image of the actual rod rupture, showing that the material fractured by an intergranular micromechanism, evidencing a tempered martensite embrittlement.
59
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Fractography by SEMDf - Intergranular Fracture

+6 more from this case →

ML00181 — Wear of a Carburized Hypoid GearM - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Even in a sound tooth there are regions of pitting, and foreign incrustation, probably caused by metal removal and high contact spots.
53
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface Aspect by SEMDf - Pitting
Macroscopic detail of the pitting damage and plastic deformation at the surface of non-fractured tooth.
58
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface AspectDf - Pitting
Macroscopic detail of the fractured tooth, showing marks of plastic deformation at the tooth surface and several longitudinal cracks in the contact surfaces.
46
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface AspectDf - Crack
Aspect of the fractured tooth surface in a region presenting pitting, spalling and cracks.
42
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface Aspect by SEMDf - Spalling
Macroscopic detail of the fractured tooth, showing several longitudinal cracks in the contact surfaces, suggesting the occurrence of spalling damage.
44
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface AspectDf - Fatigue Crack

+5 more from this case →

ML00180 — Local Melting of Copper Cooling TubesM - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Transverse section of the tube in a position of localized thinning.
60
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - Transverse Section AspectDf - Localized Thinning
Micrographic aspect, as polished, of a transverse section of the tube (bottom side of the image, orange), at the interface between the tube and the melted steel over the external diameter (top side of the image, grey). In the copper tube there are several microcracks and regions of incipient melting (voids).
41
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - As polished micrographyDf - Cracks
Transverse section of the tube in a position of wall perforation.
32
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - Transverse Section AspectDf - Leakage
Local Melting of Copper Cooling Tubes
1
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - Transverse Section AspectDf - Thinning
Local Melting of Copper Cooling Tubes
1
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - Transverse Section AspectDf - Leakage
ML00179 — Hydrides in Titanium WeldM - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Detail of the end of the rib, with a crack in the fillet weld metal, propagating through the pipe wall.
40
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Aspect Before AnalysisDf - Cracking
The through wall cracking was opened by longitudinal cutting of the pipe in two positions, to analyzed the region where the crack was nucleated.
32
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fracture Surface AspectDf - Fracture
Aspect of the opened crack, showing the flat fracture. The through wall cracking started at the welded region at the end of the rib.
38
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fracture Surface AspectDf - Fracture
Aspect of the opened crack by scanning electron microscopy, showing the coarser structure in the weld (right side of the figure).
33
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fractography by SEMDf - Fracture
In the region where the fracture started there are brittle aspects resembling a cleavage micromechanism and several secondary cracks, transverse to the fracture surface, as well as propagation by fatigue (striation).
36
VIEW
ML00179 / Feb.2022
Hydrides in Titanium Weld
M - Unalloyed TitaniumP - In Field WeldAp - Chemical IndustryCd - Hydride Formation
Cm - Fractography by SEMDf - Brittle Cracks

+7 more from this case →

ML00178 — Cold cracks in Cr-Mo Welded ForgingM - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
The cracking is located at the margin of the weld in the forging side. It is 1.2 mm deep.
66
VIEW
ML00178 / Jan.2022
Cold cracks in Cr-Mo Welded Forging
M - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Cracking
The intergranular morphology of the cracks, at the heat affected zone of the forging, indicates it is a cold cracking probably formed when the welded joint was not yet post welding heat treated. The actual hardness values at the HAZ is 270HV10, and when it was cracked it was probably a lot higher.
71
VIEW
ML00178 / Jan.2022
Cold cracks in Cr-Mo Welded Forging
M - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Intergranular Cracking
Detail of the cold cracking at the previous austenite grain boundary of the martensitic structure.
55
VIEW
ML00178 / Jan.2022
Cold cracks in Cr-Mo Welded Forging
M - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Intergranular Cracking
Detail of the cold cracking at the previous austenite grain boundary of the martensitic structure.
59
VIEW
ML00178 / Jan.2022
Cold cracks in Cr-Mo Welded Forging
M - CrMo SteelP - ForgingAp - O&G Well DrillingCd - Welding Defect
Cm - Nital Etched Micrography by SEMDf - Intergranular Cracking
ML00177 — Cr-Mo Seam Welded TubeM - CrMo SteelP - Longitudinally Seam WeldedAp - Fired HeaterCd - Not according to spec
WELD METAL SURFACE
43
VIEW
ML00177 / Dec.2021
Cr-Mo Seam Welded Tube
M - CrMo SteelP - Longitudinally Seam WeldedAp - Fired HeaterCd - Not according to spec
Cm - Nital Etched Micrography by OMDf - Segregated Regions
WELD METAL T/2
31
VIEW
ML00177 / Dec.2021
Cr-Mo Seam Welded Tube
M - CrMo SteelP - Longitudinally Seam WeldedAp - Fired HeaterCd - Not according to spec
Cm - Nital Etched Micrography by OMDf - Segregated Regions