Damage

4 cases · 33 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Lifting clear all

Damage — sub-branches

Brittle Fracture 1Casting defects 3Chevron Marks 2Cracking 2Cracks 2Dimples 1Ductile Fracture 1Elongated Dimples 1Fracture 10Intergranular Fracture 2Oxide Layer 1Plastic Deformation 5Secondary Cracks 2

Results

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Macrosection of the wire rope, transverse, showing 6 strands and an independent wire rope core (IWRC). Each strand presents three layers in a SEALE construction.
92
VIEW
ML00175 / Aug.2021
Localized External Wear of a Wire Rope
M - High Carbon SteelP - Wire RopeAp - Oil and GasCd - Wear
Cm - Transverse Section AspectDf - Plastic Deformation
Visual aspect of both sides of the fractures. They present a macroscopically brittle aspect, with chevron marks indicating the starting point at the thinner edge of the thread.
81
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Aspect Before AnalysisDf - Fracture
Micrography of a transverse section of the lifting part, showing interdendritic voids close to the surface at the inner diameter of the padeye. The microstructure is tempered martensite.
450
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Casting defects
The fracture micromechanism is ductile for the pin that has been sheared in a condition of controlling the load carrying. Elongated Dimples.
453
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - Fractography by SEMDf - Elongated Dimples

More from these cases

ML00175 — Localized External Wear of a Wire RopeM - High Carbon SteelP - Wire RopeAp - Oil and GasCd - Wear
Metallographic detail of the wire surface in one strand external wire, showing the presence of oxides.
39
VIEW
ML00175 / Aug.2021
Localized External Wear of a Wire Rope
M - High Carbon SteelP - Wire RopeAp - Oil and GasCd - Wear
Cm - Nital Etched Micrography by OMDf - Oxide Layer
Detail of the cracks associated to deformed regions in the outer wire of a strand.
40
VIEW
ML00175 / Aug.2021
Localized External Wear of a Wire Rope
M - High Carbon SteelP - Wire RopeAp - Oil and GasCd - Wear
Cm - Aspect Before AnalysisDf - Cracks
One disassembled wire, 3.2mm diameter, from a strand. The wire presents strong plastic deformation. In a very localized area.
29
VIEW
ML00175 / Aug.2021
Localized External Wear of a Wire Rope
M - High Carbon SteelP - Wire RopeAp - Oil and GasCd - Wear
Cm - Aspect Before AnalysisDf - Plastic Deformation
ML00148 — Brittle Fracture of a 420 SS Barrel NutM - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
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
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
Aspect by scanning electron microscopy of the brittle fracture surface. in a low magnification view. The fracture presents smashed regions (conditions imposed after the fracture was opened) in the region where the chevron marks indicate it is the failure starting point.
26
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Fractography by SEMDf - Brittle Fracture
Observing in higher magnification it is possible to see that the fracture presents a mixture of ductile and brittle micromechanisms. The intergranular mechanism indicates that the material is embrittled and the dimples indicate localized overloading conditions.
32
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Fractography by SEMDf - Fracture
Detail of the ductile dimples and the brittle intergranular micromechanisms. This evidence (a mixture of mechanisms) suggests that the embrittlement is localized in some regions of the material.
34
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Fractography by SEMDf - Fracture

+8 more from this case →

ML00098 — Brittle Fracture of a Casting Lifting DeviceM - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Aspect of the fracture surface, showing a brittle morphology. Flat fracture with chevron marks from regions close to the internal diameter of the padeye, where there are secondary cracks.
22
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Aspect Before AnalysisDf - Fracture
Macrography of a "longitudinal" section of the padeye showing casting defects close to the internal diamater and a secondary crack, paralel to fracture, starting from the internal diameter. The fracture is not presented in this macro, it is to the top of the photo.
17
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - NItal Etched MacroDf - Cracking
Macrographic detail of the secondary crack, paralel to fracture, starting from the internal diameter of the padeye. The dendritic structure is evident.
13
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - NItal Etched MacroDf - Secondary Cracks
Micrography of the secondary crack, paralel to fracture, starting from the internal diameter of the padeye. The crack propagates in an interdendritic morphology, interconnecting casting defects.
13
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Secondary Cracks
Micrographic detail of the secondary crack, paralel to fracture, at the internal diameter of the padeye. The microstructure is martensitic.
14
VIEW
ML00098 / Nov.2017
Brittle Fracture of a Casting Lifting Device
M - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Cracking

+5 more from this case →

ML00007 — Free Machining Brass in Shear PinM - BrassP - Machined PartAp - LiftingCd - Shear
The fracture surface is flat and smashed due to the shearing action.
87
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - Aspect Before AnalysisDf - Fracture
The fracture surface is ductile and the micromechanism is dimples, elongated due to the shearing action.
83
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - Fractography by SEMDf - Ductile Fracture
The micrography of the pin at the fracture surface shows a strong plastic deformation as expected during shearing.
69
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - FeCl3+HCl+H2O Etched MicroDf - Plastic Deformation