Optical Microscope

4 cases · 5 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Martensite Detail focus: Intergranular Cracking clear all

Optical Microscope — sub-branches

As polished micrography 2Nital Etched Micrography by OM 3

Results

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Micrography perpendicular to the fracture surface showing, in the secondary cracks, the intergranular morphology of the fracture.
33
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 - Intergranular Cracking
Micrographic aspect of the multiple intergranular cracks, initiating from the bottom of a pit.
25
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - As polished micrographyDf - Intergranular Cracking
Micrographic aspect of the disc fracture (in the right side of the figure). It is possible to see that the structure is martensitic and there are secondary intergranular cracks associated to the fracture.
25
VIEW
ML00080 / Sep.2017
MIC of Stacking Disc Springs
M - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Cm - Nital Etched Micrography by OMDf - Intergranular Cracking
Micrography of a longitudinal section of the pin, at the fracture position, showing the main fracture surface and secondary cracks associated to a segregation band, with an intergranular morphology.
49
VIEW
ML00009 / Sep.2017
Hydrogen Cracking of a 5" Drill Pipe S135
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Nital Etched Micrography by OMDf - Intergranular Cracking

More from these cases

ML00172 — Brittle Fracture of a LAS Valve SpringM - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Micrographic detail of the intergranular cracks, initiating from the bottom of a pit.
29
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - As polished micrographyDf - Intergranular Cracking