Intergranular Cracking

4 cases · 5 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Martensite Capture method: Optical Microscope clear all

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Micrography perpendicular to the fracture surface showing, in the secondary cracks, the intergranular morphology of the fracture.

33

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

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

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

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

29

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