Atlas

6 cases · 15 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Ferritic pearlitic Detail focus: Transverse Section clear all

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Aspect of the 3/8" thickness plate, 50 mm x 50 mm, of the low carbon steel, in a section transverse to the impact position that is to the top of the figure. The perforated hole expulsed the material to the top and bottom directions. The hole is larger in the exit of the bullet.
53
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Transverse Section AspectDf - Transverse Section
Micrography of the pipe transverse section presenting a granular microstructure.
147
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Nital Etched Micrography by OMDf - Transverse Section
Micrography, as polished, of the transverse section of the forged pin with the layer applied by a (thermal) spray and fuse process. The layer presented entrapped pores and globular oxides. It was melted after application by thermal spray (in this case using a flame) but the pin was not heat treated after the full application and melting of the layer and the base metal is ferritc-pearlitic.
51
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Transverse Section
Micrography of the transverse section of the rolled shape presenting an aligned structure, ferritic-pearlitic.
62
VIEW
ML00035 / Dec.2017
Carbon Steel L Shape
M - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Transverse Section
The macrography of a transverse section shows the carbon steel tube, externally cladded with stainless steel. The tube was removed from service where it was welded to other tubes to form a wall.
156
VIEW
ML00056 / May.2018
Seamless Tube Externally Cladded with SS
M - Carbon Steel / Stainless SteelP - CladdingAp - Pulp and PaperCd - Removed From Service
Cm - Kalling Etched MacroDf - Transverse Section
Macrography of a transverse section of the steam drum sample that was removed after the inspection had detected multiple cracks propagating into the thickness, more than 50% deep in the thickness.
190
VIEW
ML00018 / Apr.2017
SCC in Boiler Steam Drum
M - Low Carbon SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Cm - NItal Etched MacroDf - Transverse Section

More from these cases

ML00143 — Impact of a .308 Winchester on A36 PlateM - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Macrography of the 3/8" thickness low carbon steel plate, in a section. The side of bullet impact is to the top of the figure. The perforated hole expulsed the material to the top and bottom directions. The hole is larger in the exit of the bullet (to the bottom of the figure).
31
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - NItal Etched MacroDf - Transverse Section
Micrographic detail of the plate section, as polished, close to the surface that suffered the impact. The plate material deformed during the perforation,
31
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - As polished micrographyDf - Transverse Section
Macrographic detail of the 3/8" low carbon steel plate. The side of bullet impact is to the top of the figure. The perforated hole expulsed the material to the top and bottom directions. The hole is in the left side of the figure.
23
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by OMDf - Transverse Section
Jagged, torn material boundary at the perforation edge, consistent with localized shear deformation from projectile penetration.
21
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - As polished micrographyDf - Transverse Section
Macrographic detail of the 3/8" thickness low carbon steel plate. The side of bullet exit is to the bottom of the figure. The perforated hole expulsed the material to the top and bottom directions. The hole is in the right side of the figure.
12
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - NItal Etched MacroDf - Transverse Section
ML00140 — Preferential Corrosion of Pipe Seam WeldM - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Detail of the transverse section of the 4" pipe 90° from the seam weld. The thickness of the pipe is 8 mm. No evidences of general corrosion or pitting were identified.
77
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Transverse Section AspectDf - Transverse Section
Detail of the transverse section of the 4" pipe 90° from the seam weld. The thickness of the pipe is 8 mm. No evidences of general corrosion or pitting were identified.
70
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Transverse Section AspectDf - Transverse Section
Detail of the transverse section of the 4" pipe 180° from the seam weld. The thickness of the pipe is 8 mm. No evidences of general corrosion or pitting were identified.
64
VIEW
ML00140 / May.2019
Preferential Corrosion of Pipe Seam Weld
M - Low Carbon SteelP - Longitudinal Seam Welded PipeAp - ShipCd - Preferential Dissolution
Cm - Transverse Section AspectDf - Transverse Section
ML00056 — Seamless Tube Externally Cladded with SSM - Carbon Steel / Stainless SteelP - CladdingAp - Pulp and PaperCd - Removed From Service
Macrography of the tube transversal section presenting the studied assembly.
136
VIEW
ML00056 / May.2018
Seamless Tube Externally Cladded with SS
M - Carbon Steel / Stainless SteelP - CladdingAp - Pulp and PaperCd - Removed From Service
Cm - Macro Oxalic Acid Electrolytic EtchedDf - Transverse Section