Optical Microscope

15 cases · 57 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Structure Detail focus: Microstructure clear all

Optical Microscope — sub-branches

As polished micrography 1Chromic Acid Electrolytic Etched 1Eletrolytically Etched Micrography by OM 2FeCl3+HCl+Ethanol Etched Micro 1FeCl3+HCl+H2O Etched Micro 3Glyceregia Etched Micrography by OM 1H2SO4+HNO3+H3PO4 Etched Micro 1Keller Etched Micrography by OM 5Micrography by OM 6Micrography by OM, HF + HNO3 + H2O etch 6Nital Etched Micrography by OM 30

Results

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Micrographic detail of a transverse section of the tubing, in the center of the thickness. Ferritic-pearlitic structure. Pearlite colonies in bands.
346
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 - Ferrite and Pearlite
Micrographic detail of the ferritic-pearlitic structure of the angle L shape, equal legs, in the transverse section.
468
VIEW
ML00035 / Dec.2017
Carbon Steel L Shape
M - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
Micrographic detail of the slightly banded perlitic structure, in the center of the thickness. ND 3". 7.6 mm thick.
531
VIEW
ML00090 / Sep.2017
Carbon Steel Tubing for Structural Application
M - Low Carbon SteelP - TubeAp - StructureCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
Ferritic perlitic structure of the plate. Longitudinal section.
28
VIEW
ML00033 / Jan.2017
Plasma Cut of 1 1/4" Steel Plate
M - High Strength Low AlloyP - Rolled PlateAp - StructureCd - Cutting
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
The plate longitudinal section presents a granular refined structure. Biphasic.
340
VIEW
ML00029 / Jan.2017
Titanium Plate for Subsea Application
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Typical manufacturing
Cm - Micrography by OM, HF + HNO3 + H2O etchDf - Grain refined structure
The bar presented a large prior beta grain size and acicular alpha. Biphasic structure.
420
VIEW
ML00028 / Jan.2017
Titanium Bar for Subsea Application
M - Ti6Al4VP - BarAp - StructureCd - Typical manufacturing
Cm - Micrography by OM, HF + HNO3 + H2O etchDf - Coarse Structure
The micrography of the pin far from the fracture surface shows a biphasic brass, and Pb inclusions that are intentional to give a free machining condition for the alloy.
76
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - FeCl3+HCl+H2O Etched MicroDf - Two phases

More from these cases

ML00114 — CMn Steel Structural Tubing 8 mm thickM - CMn SteelP - Seamless Round ShapeAp - StructureCd - Removed From Service
Low magnification micrography of a transverse section of the tubing, in the center of the thickness. Ferritic-pearlitic banded structure.
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 - Banded Structure
ML00035 — Carbon Steel L ShapeM - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Micrography of the transverse section of the rolled shape presenting an aligned structure, ferritic-pearlitic, and long sulfide inclusions. Center of the leg of 12 mm thickness.
58
VIEW
ML00035 / Dec.2017
Carbon Steel L Shape
M - Low Carbon SteelP - Rolled ShapeAp - StructureCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - Non Metallic Inclusions
ML00090 — Carbon Steel Tubing for Structural ApplicationM - Low Carbon SteelP - TubeAp - StructureCd - Typical manufacturing
Micrography of a longitudinal section of the tube, in the center of the thickness. ND 3". 7.6 mm thick.
55
VIEW
ML00090 / Sep.2017
Carbon Steel Tubing for Structural Application
M - Low Carbon SteelP - TubeAp - StructureCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
ML00033 — Plasma Cut of 1 1/4" Steel PlateM - High Strength Low AlloyP - Rolled PlateAp - StructureCd - Cutting
Ferritic perlitic structure of the plate. Longitudinal section.
29
VIEW
ML00033 / Jan.2017
Plasma Cut of 1 1/4" Steel Plate
M - High Strength Low AlloyP - Rolled PlateAp - StructureCd - Cutting
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
Martensitic structure at the cutting HAZ. Longitudinal section.
29
VIEW
ML00033 / Jan.2017
Plasma Cut of 1 1/4" Steel Plate
M - High Strength Low AlloyP - Rolled PlateAp - StructureCd - Cutting
Cm - Nital Etched Micrography by OMDf - Martensite
Martensitic structure at the cutting HAZ. Longitudinal section.
29
VIEW
ML00033 / Jan.2017
Plasma Cut of 1 1/4" Steel Plate
M - High Strength Low AlloyP - Rolled PlateAp - StructureCd - Cutting
Cm - Nital Etched Micrography by OMDf - Martensite
ML00029 — Titanium Plate for Subsea ApplicationM - Ti6Al4VP - Rolled PlateAp - StructureCd - Typical manufacturing
Alpha and beta phases. Refined Structure.
52
VIEW
ML00029 / Jan.2017
Titanium Plate for Subsea Application
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Typical manufacturing
Cm - Micrography by OM, HF + HNO3 + H2O etchDf - Two phases
Alpha and beta phases. Refined Structure.
46
VIEW
ML00029 / Jan.2017
Titanium Plate for Subsea Application
M - Ti6Al4VP - Rolled PlateAp - StructureCd - Typical manufacturing
Cm - Micrography by OM, HF + HNO3 + H2O etchDf - Two phases
ML00028 — Titanium Bar for Subsea ApplicationM - Ti6Al4VP - BarAp - StructureCd - Typical manufacturing
The bar presented alpha plus beta phases, acicular alpha and coarse prior beta grains.
97
VIEW
ML00028 / Jan.2017
Titanium Bar for Subsea Application
M - Ti6Al4VP - BarAp - StructureCd - Typical manufacturing
Cm - Micrography by OM, HF + HNO3 + H2O etchDf - Two phases
Acicular alpha structure in a biphasic alloy of a large prior beta grain size. 4" diameter bar.
100
VIEW
ML00028 / Jan.2017
Titanium Bar for Subsea Application
M - Ti6Al4VP - BarAp - StructureCd - Typical manufacturing
Cm - Micrography by OM, HF + HNO3 + H2O etchDf - Acicular Alpha