Scanning Electron Microscope

3 cases · 11 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Condition: Damage Microstructure: Segregation Bands clear all

Scanning Electron Microscope — sub-branches

Fractography by SEM 7Nital Etched Micrography by SEM 3Surface Aspect by SEM 1

Results

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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
Aspect of the spring surface, with a layer of corroded products, and pits.
36
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Surface Aspect by SEMDf - Corrosion
Fractographic aspect of the stud fracture surface, by scanning electron microscopy, close to the bottom of the thread fillet. In the center of the image it is possible to see secondary cracks with intergranular morphology.
59
VIEW
ML00136 / Jun.2018
Hydrogen Cracks of Subsea Studs
M - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Brittle Fracture

More from these cases

ML00182 — Brittle Fracture of a LAS Fixing RodM - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Fractographic detail of the intergranular micromechanism, evidencing a tempered martensite embrittlement.
49
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
Fractographic detail of the intergranular micromechanism, evidencing a tempered martensite embrittlement.
44
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
Broken tensile testpiece fractography showing predominantly dimples as the fracture micromechanism, and some integranular aspects. It shows that in this uniaxial and without stress concentration raisers, the material presented a ductile behavior.
30
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 - Broken Testpiece
Broken Charpy V testpiece fractography showing intergranular fracture micromechanism. It reveals the brittle material behavior when under critical conditions, like the one that was present in the service application (with a triaxial condition in the notch).
26
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 - Broken Testpiece
ML00172 — Brittle Fracture of a LAS Valve SpringM - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Micrographic detail of the martensitic structure, clearly obtained from a refined previous austenitic structure .
19
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by SEMDf - Martensite
Micrographic detail of the martensitic structure.
19
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by SEMDf - Martensite
ML00136 — Hydrogen Cracks of Subsea StudsM - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Fractographic detail by scanning electron microscopy of the secondary cracks with intergranular morphology.
47
VIEW
ML00136 / Jun.2018
Hydrogen Cracks of Subsea Studs
M - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Secondary Cracks
Micrography of the bottom of the thread fillet, presenting secondary cracks of intergranular morphology, propagating transverse to the stud axis, but presenting longitudinal openings.
28
VIEW
ML00136 / Jun.2018
Hydrogen Cracks of Subsea Studs
M - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Nital Etched Micrography by SEMDf - Cracks