Boiler

1 case · 8 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Degradated Capture method: Optical Microscope Detail focus: Microstructure clear all

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Micrography of a longitudinal section of the tube, 200 mm far from the cracked region, in the center of the thickness (3.9 mm) showing a granular ferritic-perlitic structure.
139
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 - Ferrite and Pearlite

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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, 200 mm far from the cracked region, in the center of the thickness (3.9 mm). Feritic perlitic structure.
113
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 - Ferrite and Pearlite
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
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
Micrography of the longitudinal section of the tube, close to OD, showing no damage in a section about 200mm far from the cracked region.
92
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 - Ferrite and Pearlite
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

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