Atlas

2 cases · 19 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Siderurgy Standard: UNS Capture method: Optical Microscope clear all

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Micrographic aspect of the tube out of the damaged region, in a longitudinal section, showing the grain refined copper structure.
96
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - FeCl3+HCl+H2O Etched MicroDf - In the Center of the Thickness
Polished cross-section showing rounded graphite nodules within a ferritic matrix, bordered by an irregular oxidized region at the surface edge.
910
VIEW
ML00001 / Dec.2017
Thermal Fatigue of Cast Iron
M - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Oxide Layer

More from these cases

ML00180 — Local Melting of Copper Cooling TubesM - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Micrographic detail of the granular copper structure, a little far from the overheated region.
102
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - FeCl3+HCl+H2O Etched MicroDf - Granular structure
Micrographic detail of the granular copper structure, out of the damaged area. The dark particles are non metallic (oxides).
93
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - FeCl3+HCl+H2O Etched MicroDf - Granular structure
Micrographic aspect, as polished, of a transverse section of the tube (bottom side of the image, orange), at the interface between the tube and the melted steel over the external diameter (top side of the image, grey). In the copper tube there are several microcracks and regions of incipient melting (voids).
41
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - As polished micrographyDf - Cracks
Micrographic aspect of the tube wall under the localized thinning, in a transverse section, showing a coarse structure due to high temperature grain growth.
37
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - FeCl3+HCl+H2O Etched MicroDf - Overheating
Micrographic detail of the high temperature grain growth in the tube microstructure.
31
VIEW
ML00180 / Mar.2022
Local Melting of Copper Cooling Tubes
M - Pure CopperP - Cooling TubeAp - SiderurgyCd - Overheating
Cm - FeCl3+HCl+H2O Etched MicroDf - Coarse Structure

+6 more from this case →

ML00001 — Thermal Fatigue of Cast IronM - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
The 1" flat casting product presents a ferritic perlitic matrix and graphite nodules.
112
VIEW
ML00001 / Dec.2017
Thermal Fatigue of Cast Iron
M - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Graphite in Nodules
Center of the flat casting product, presenting nodular graphite and ferritic perlitic matrix.
113
VIEW
ML00001 / Dec.2017
Thermal Fatigue of Cast Iron
M - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Predominantly Ferritic Matrix
Nodular cast iron presenting a ferritic perlitic matrix.
109
VIEW
ML00001 / Dec.2017
Thermal Fatigue of Cast Iron
M - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Matrix of ferrite and pearlite
Nodular cast iron. Ferritic perlitic matrix. White regions in the pearlite colonies are free carbides.
129
VIEW
ML00001 / Dec.2017
Thermal Fatigue of Cast Iron
M - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Free Carbides in Pearlite Colonies
The graphite nodules remain at the surface and the matrix was consumed during high temperature exposition.
117
VIEW
ML00001 / Dec.2017
Thermal Fatigue of Cast Iron
M - Nodular Cast IronP - CastAp - SiderurgyCd - Thermal Fatigue
Cm - Nital Etched Micrography by OMDf - Oxide Layer

+1 more from this case →