Used

15 cases · 67 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Optical Microscope Detail focus: Sampling and Analysis clear all

Used — sub-branches

Non Destructive Examination 1Removed From Service 18

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Tin Bronze Wear Ring of Seawater Pump
2
VIEW
ML00166 / Jul.2020
Tin Bronze Wear Ring of Seawater Pump
M - Tin BronzeP - Wear RingAp - ShipCd - Removed From Service
Cm - FeCl3+HCl+H2O Etched MicroDf - General View
Micrography of the wheel in the center of the thickness. The material presents a coarse structure.
88
VIEW
ML00158 / Feb.2020
Surface Hardened Carbon Steel Wheel
M - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
The longitudinal section of the shaft, in the center of the thickness, shows a coarse structure, and a ferritic/bainitic structure with pearlite islands.
97
VIEW
ML00152 / Dec.2018
Low Alloy Steel Pump Shaft
M - High Strength Low AlloyP - ShaftAp - Oil and GasCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Longitudinal Section
Micrography of a transverse section of the tubing, in the center of the thickness. Ferritic-pearlitic structure. Bands of pearlite colonies. Refined grains.
26
VIEW
ML00116 / Jan.2018
CMn Steel Structural Tubing 6 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrography of a transverse section of the tubing, in the center of the thickness. Ferritic-pearlitic structure. The pearlite is banded and presented a coalesced aspect.
12
VIEW
ML00115 / Jan.2018
CMn Steel Structural Tubing 5 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrography of a transverse section of the tubing, in the center of the thickness. Ferritic-pearlitic structure. Bands of pearlite colonies. Refined grains.
29
VIEW
ML00114 / Jan.2018
CMn Steel Structural Tubing 8 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrography of the transverse section of the rolled shape presenting an aligned structure, ferritic-pearlitic. Transverse section.
97
VIEW
ML00035 / Dec.2017
Carbon Steel L Shape
M - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrography of the cast rim, base metal, in the as polished condition, showing the dendrites of alpha aluminum and interdendritic eutectic Si/alpha, silicon particles in a coalesced condition that sugegsts a solution annealed treatment.
119
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Micrography by OMDf - Base Metal

More from these cases

ML00166 — Tin Bronze Wear Ring of Seawater PumpM - Tin BronzeP - Wear RingAp - ShipCd - Removed From Service
Tin Bronze Wear Ring of Seawater Pump
2
VIEW
ML00166 / Jul.2020
Tin Bronze Wear Ring of Seawater Pump
M - Tin BronzeP - Wear RingAp - ShipCd - Removed From Service
Cm - FeCl3+HCl+H2O Etched MicroDf - General View
ML00158 — Surface Hardened Carbon Steel WheelM - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Micrography of the wheel at the surface that was quenched and tempered. The material presents a tempered martensitic structure, with hardness that varied from 327HB to 363HB.
55
VIEW
ML00158 / Feb.2020
Surface Hardened Carbon Steel Wheel
M - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - At the Surface
Micrography of the wheel at the hardened surface, presenting a refined martensitic structure, tempered for average hardness of 346 HB.
50
VIEW
ML00158 / Feb.2020
Surface Hardened Carbon Steel Wheel
M - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - At the Surface
Micrographic aspect of the rim microstructure at the surface (internal to the wheel), not the heat treated one. The pearlitic structure is not so coarse than in the center of the thickness.
38
VIEW
ML00158 / Feb.2020
Surface Hardened Carbon Steel Wheel
M - High Carbon SteelP - WheelAp - TransportationCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Internal Surface
ML00152 — Low Alloy Steel Pump ShaftM - High Strength Low AlloyP - ShaftAp - Oil and GasCd - Removed From Service
The longitudinal section of the shaft, at the surface, also shows a coarse structure, and a ferritic/bainitic structure with pearlite islands. There is only a small refining in the previous austenite grain boundaries, indicating that the material was not heat treated.
75
VIEW
ML00152 / Dec.2018
Low Alloy Steel Pump Shaft
M - High Strength Low AlloyP - ShaftAp - Oil and GasCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Longitudinal Section
ML00116 — CMn Steel Structural Tubing 6 mm thickM - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Micrography of a transverse section of the tubing in the center of the thickness. Ferritic-pearlitic structure. The structure is fully ferritic in a small extension at the surface, due to a decarburization effect during manufacturing.
26
VIEW
ML00116 / Jan.2018
CMn Steel Structural Tubing 6 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Close to the External Surface
Micrographic detail of a transverse section of the tubing, close to the internal surface. Ferritic-pearlitic structure, refined.
20
VIEW
ML00116 / Jan.2018
CMn Steel Structural Tubing 6 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Close to the Internal Surface
ML00115 — CMn Steel Structural Tubing 5 mm thickM - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Micrographic detail of a transverse section of the tubing, at the external surface. Ferritic-pearlitic structure. The roughness of the surface is high because the structure was painted and a blasting treatment was probably applied to the surface to improve adherence.
15
VIEW
ML00115 / Jan.2018
CMn Steel Structural Tubing 5 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Close to the External Surface
Micrographic detail of a transverse section of the tubing, close to the internal surface. Ferritic-pearlitic structure. Very close to the surface the amount of ferrite is higher than in the center and the grain is coarser, due to a decarburization effect probably occurred when the surface was exposed to high temperature during manufacturing.
13
VIEW
ML00115 / Jan.2018
CMn Steel Structural Tubing 5 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Close to the Internal Surface
ML00114 — CMn Steel Structural Tubing 8 mm thickM - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Micrography of a transverse section of the tubing, at the external surface. Ferritic-pearlitic structure. The roughness of the surface is high because the structure was painted and a blasting treatment was probably applied to the surface to improve adherence.
20
VIEW
ML00114 / Jan.2018
CMn Steel Structural Tubing 8 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Close to the External Surface
Micrography of a transverse section of the tubing, close to the internal surface. Ferritic-pearlitic structure, refined.
16
VIEW
ML00114 / Jan.2018
CMn Steel Structural Tubing 8 mm thick
M - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Close to the Internal Surface
ML00035 — Carbon Steel L ShapeM - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Micrography of the transverse section of the rolled shape presenting a ferritic-pearlitic microstructure. Transverse section, close to the surface.
80
VIEW
ML00035 / Dec.2017
Carbon Steel L Shape
M - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - At the Surface
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
ML00070 — Automotive Light Alloy Wheel Repaired By WeldingM - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Micrography of the cast rim, base metal, showing the dendrites of alpha aluminum and interdendritic eutectic Si/alpha, silicon particles in a coalesced condition that suggests a solution annealed treatment. After etching it is possible to identify a transgranular precipitation (aging) and a dark FeSiAl phase (neddles).
87
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Base Metal
Micrographic detail of the cast rim, base metal, in the as polished condition, showing the dendrites of alpha aluminum and interdendritic eutectic Si/alpha, silicon particles in a coalesced condition that sugegsts a solution annealed treatment.
74
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Micrography by OMDf - Base Metal
Micrographic detail of the cast rim, base metal, showing the dendrites of alpha aluminum and interdendritic eutectic Si/alpha, silicon particles in a coalesced condition that suggests a solution annealed treatment. After etching it is possible to identify a transgranular precipitation (aging) and a dark FeSiAl phase (neddles).
62
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Base Metal
Low magnification micrography of the welded region, showing the base metal in the bottom, the fusion zone (between the liquidus and solidus temperatures) in the center and the weld metal in the top. There are pores close to the weld metal and in the fusion zone the interdendritic space was melted and the eutectic morphology was changed.
64
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Weld Repair
The cast material that presents for the base metal a coalesced silicon particles in the interdendritic space and intragranular precipitation shows a solution effect at the heat affected zone.
52
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Heat Affected Zone

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