Damage

3 cases · 15 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Standard: Modified Capture method: Optical Microscope clear all

Damage — sub-branches

Aged Microstructure 2Brittle Cracks 2Cracks 3Ductile Crack 2Ductile Fracture 1Multiple cracks 1Plastic Deformation 2Secondary Cracks 2

Results

SortNewestOldestTitle A-ZTitle Z-A
Cast fitting microstructure. The material presented a network of primary carbided and an austenitic matrix with coalescing secondary precipitation.
37
VIEW
ML00173 / May.2021
Welding Cracks in an Aged HP Cast Fitting
M - Heat Resistant SteelP - Cast FtittingAp - PetrochemicalCd - Welding
Cm - Kalling Etched Micrography by OMDf - Aged Microstructure
Micrography, as polished, of the socket in a section transverse to the fracture, showing the fracture in the top and secondary brittle cracks.
45
VIEW
ML00161 / Mar.2020
Brittle Fracture of a High Strength Socket
M - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Cm - As polished micrographyDf - Secondary Cracks
Micrography of the longitudinal section of the pipe, at the thicker part of the fracture, showing several secondary cracks opened to the external side of the pipe. There are no problems in the material structure and the cracks are associated to large plastic deformation.
36
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Ductile Crack

More from these cases

ML00173 — Welding Cracks in an Aged HP Cast FittingM - Heat Resistant SteelP - Cast FtittingAp - PetrochemicalCd - Welding
Micrographic detail of the network of primary carbided, white and grey, and an austenitic matrix with coalescing secondary precipitation.
30
VIEW
ML00173 / May.2021
Welding Cracks in an Aged HP Cast Fitting
M - Heat Resistant SteelP - Cast FtittingAp - PetrochemicalCd - Welding
Cm - Kalling Etched Micrography by OMDf - Aged Microstructure
Micrographic detail of the cracks at the fusion line, associated to the partially melted region suggesting a liquation effect in a material that presented low ductility. After opening the cracks they propagate brittle into the base metal and created a solidification cracking in the weld metal, detailed in the next figures.
23
VIEW
ML00173 / May.2021
Welding Cracks in an Aged HP Cast Fitting
M - Heat Resistant SteelP - Cast FtittingAp - PetrochemicalCd - Welding
Cm - Kalling Etched Micrography by OMDf - Multiple cracks
Micrographic detail of the cracks in the base metal created from the partially melted region suggesting that a liquation effect propagated brittle cracks into the low ductility base metal.
30
VIEW
ML00173 / May.2021
Welding Cracks in an Aged HP Cast Fitting
M - Heat Resistant SteelP - Cast FtittingAp - PetrochemicalCd - Welding
Cm - Kalling Etched Micrography by OMDf - Cracks
ML00161 — Brittle Fracture of a High Strength SocketM - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Micrographic details of cracks with brittle aspect (straight and multiple cracks).
42
VIEW
ML00161 / Mar.2020
Brittle Fracture of a High Strength Socket
M - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Cm - As polished micrographyDf - Cracks
Micrography of the socket in a section transverse to the fracture, showing the fracture in the top and some secondary brittle cracks.
42
VIEW
ML00161 / Mar.2020
Brittle Fracture of a High Strength Socket
M - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Secondary Cracks
Micrographic detail of a secondary crack transverse to the fracture (in the top), showing its appearance as multiple openings, straight and with intergranular and transgranular characteristics .
35
VIEW
ML00161 / Mar.2020
Brittle Fracture of a High Strength Socket
M - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Brittle Cracks
Micrographic detail of a secondary crack transverse to the fracture (in the top), showing its transgranular appearance at this position.
34
VIEW
ML00161 / Mar.2020
Brittle Fracture of a High Strength Socket
M - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Brittle Cracks
Micrographic details of cracks with brittle aspect (straight and multiple cracks).
2
VIEW
ML00161 / Mar.2020
Brittle Fracture of a High Strength Socket
M - Medium Carbon Tool SteelP - ToolAp - Oil and GasCd - Brittle Fracture
Cm - As polished micrographyDf - Cracks
ML00159 — Collapse of a Drill PipeM - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Micrographic detail of the secondary cracks opened to the external side of the pipe. The cracks are associated to large plastic deformation.
30
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Ductile Crack
Micrographic detail of the ductile secondary cracks in the pipe body, close to the fracture. The strong plastic deformation is associated to the compression stresses generated by the buckling.
27
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
Micrography of a longitudinal section of the pipe at the fracture position, in the thinner thickness. The diagonal line in the middle of the figure is the fracture surface and it is possible to identify that it was sheared with strong plastic deformation. The segregation bands (longitudinal lines) are deformed in the direction of the failure shearing, in a depth that is several milimeters deep in the pipe, from the fracture surface.
17
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Ductile Fracture
Micrographic detail of sheared pipe, showing strong plastic deformation at the fracture. All the structure is deformed in the direction of the failure shearing.
17
VIEW
ML00159 / Mar.2020
Collapse of a Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Ductile Behavior
Cm - Nital Etched Micrography by OMDf - Plastic Deformation