Degradated

1 case · 4 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Optical Microscope Detail focus: Coalesced structure clear all

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Micrography of a longitudinal section of the tube, at the cracked region, in the center of the thickness, showing an evolution of the perlitic structure into carbides.
110
VIEW
ML00104 / Dec.2017
Thermal Fatigue of a Boiler Tube
M - Low Carbon SteelP - Autogenously Welded TubeAp - BoilerCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Coalesced structure

More from these cases

ML00104 — Thermal Fatigue of a Boiler TubeM - Low Carbon SteelP - Autogenously Welded TubeAp - BoilerCd - Thermal Fatigue
Micrographic detail of a longitudinal section of the tube, at the cracked region, in the center of the thickness. The pearlitic structure was already degratated into globular carbides.
101
VIEW
ML00104 / Dec.2017
Thermal Fatigue of a Boiler Tube
M - Low Carbon SteelP - Autogenously Welded TubeAp - BoilerCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Coalesced structure
Micrographic detail of the thermal fatigue cracking, assisted by corrosion, at the OD, in a longitudinal section. The microstructure is ferrite with coalescing carbides.
77
VIEW
ML00104 / Dec.2017
Thermal Fatigue of a Boiler Tube
M - Low Carbon SteelP - Autogenously Welded TubeAp - BoilerCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Coalesced structure
Micrographic detail of the thermal fatigue cracking, slightly assisted by corrosion, at the ID, in a longitudinal section. The microstructure is ferrite with carbides.
85
VIEW
ML00104 / Dec.2017
Thermal Fatigue of a Boiler Tube
M - Low Carbon SteelP - Autogenously Welded TubeAp - BoilerCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Coalesced structure