Optical Microscope

4 cases · 16 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Lifting Detail focus: Damage clear all

Optical Microscope — sub-branches

FeCl3+HCl+H2O Etched Micro 1Kalling Etched Micrography by OM 6Nital Etched Micrography by OM 9

Results

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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
Micrography of the nut in the longitudinal section, plastic deformation at the thread surface due to high local stresses, probably during assembling.
24
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Plastic Deformation
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 micrography of the pin at the fracture surface shows a strong plastic deformation as expected during shearing.
70
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - FeCl3+HCl+H2O Etched MicroDf - Plastic Deformation

More from these cases

ML00148 — Brittle Fracture of a 420 SS Barrel NutM - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Micrographic detail of the nut in the longitudinal section, presenting cracks associated to the plastic deformation at the thread surface. These cracks were formed due to high local contact stresses.
19
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Plastic Deformation
Micrographic detail of the nut in the longitudinal section, presenting cracks associated to the plastic deformation at the thread surface. These cracks were formed due to high local contact stresses.
17
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Cracks
Micrography of the nut in the longitudinal section, transverse to the fracture (top of the image).
15
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Fracture
Micrography transverse to the fracture (top of the image) showing no relationship with the bands.
15
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Fracture
Micrographic detail of the fracture micromechanism showing no relationship with the bands and the intergranular morphology.
23
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Intergranular Fracture
ML00098 — Brittle Fracture of a Casting Lifting DeviceM - Low Alloy Medium Carbon QTP - CastingAp - LiftingCd - Brittle Fracture
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
Micrography transverse to the fracture surface (in the top of the figure). The fracture is brittle and follows the interdendritic spaces, since these regions where the positions where there were casting defects.
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 - Fracture
Micrographic detail of a transverse section, at the fracture (in the top of the figure). The fracture is brittle and follows the voids at interdendritic spaces, with secondary cracks.
12
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 - Fracture
Micrographic detail of a transverse section, at the fracture (in the top of the figure). The fracture is brittle and follows the voids at interdendritic spaces, with secondary cracks.
10
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 - Fracture

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