Sound

6 cases · 22 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Capture method: Optical Microscope Detail focus: Heat Affected Zone clear all

Sound — sub-branches

Cutting 1Surface treatment 1Thermal spray 1Typical manufacturing 28Welding 8

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Low magnification micrography of a longitudinal section of a 4 mm diameter wire, at the region where the pearlitic strain hardened wire is affected by the welding. The base metal is to the left side and the region of the HAZ that starts with a grain growth is to the right side.
24
VIEW
ML00113 / Jan.2018
Autogenous Weld of a Carbon Steel Wire
M - Medium Carbon SteelP - WireAp - OffshoreCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrography of the tubular 4130 forging at the heat affected zone (HAZ) of the Inconel overlay (white because it was not etched with the Nital). The structure is ferritic/bainitic because the overlay was conducted in two layers, and all the HAZ was reheated during welding.
66
VIEW
ML00102 / May.2018
AISI 4130 Forging Welded and Overlaid
M - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrography of the tubing heat affected zone.
69
VIEW
ML00100 / Nov.2017
Superduplex Tubing to Forging Welded Joint
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Welding
Cm - NaOH Electrolytic Etched MicroDf - HAZ Left Side
Micrographic detail of the low temperature heat affected zone of the pipe. The intercritical temperature (IC) is evident in the decorated grain boundaries of the previous austenite.
43
VIEW
ML00066 / May.2017
GMAW Welded Joint in 9%Ni Alloy Steel
M - Nickel Alloy SteelP - Welded Testpiece for QualificationAp - PipelineCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrographic detail of the heat-affected zone close to the base metal.
29
VIEW
ML00045 / Aug.2017
Subsea Tubular F6NM Martensitic SS
M - Martensitic Stainless SteelP - Fabrication WeldAp - OffshoreCd - Welding
Cm - Kalling Etched Micrography by OMDf - Heat Affected Zone
Micrography of a section transverse to the Oxygen Plasma Cut surface, showing the zone affected by the heat generated in the cutting. The extension of the HAZ is about 0.5 mm. The cut was conducted in the 1 1/4" thickness of the plate.
359
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 - Heat Affected Zone

More from these cases

ML00113 — Autogenous Weld of a Carbon Steel WireM - Medium Carbon SteelP - WireAp - OffshoreCd - Welding
Micrography of a longitudinal section of a 4 mm diameter wire, at the heat affected zone created by the autogenous welding, presenting a tempered martensitic structure.
19
VIEW
ML00113 / Jan.2018
Autogenous Weld of a Carbon Steel Wire
M - Medium Carbon SteelP - WireAp - OffshoreCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
ML00102 — AISI 4130 Forging Welded and OverlaidM - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Micrography of the tubular 4130 forging at the heat affected zone (HAZ) of the Inconel overlay (white because it was not etched with the Nital). The structure is ferritic/bainitic because the overlay was conducted in two layers, and all the HAZ was reheated during welding.
61
VIEW
ML00102 / May.2018
AISI 4130 Forging Welded and Overlaid
M - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrography of the tubular 4130 forging at the heat affected zone (HAZ), butt weld face. The structure is tempered martensite because the welded joint was PWHT at 630°C. The original forging was normalized and tempered at 660°C.
49
VIEW
ML00102 / May.2018
AISI 4130 Forging Welded and Overlaid
M - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrography of the tubular 4130 forging at the heat affected zone (HAZ) at the face of the butt weld. The structure is a tempered martensite because the joint was PWHT at 630°C. The original forging was normalized and tempered at 660°C.
43
VIEW
ML00102 / May.2018
AISI 4130 Forging Welded and Overlaid
M - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrography of the tubular 4130 forging at the heat affected zone (HAZ), butt weld root. The structure is ferritic bainitic because of the multiple reheatings in high temperature.
51
VIEW
ML00102 / May.2018
AISI 4130 Forging Welded and Overlaid
M - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Micrography of the tubular 4130 forging at the heat affected zone (HAZ), butt weld root. The structure is ferritic bainitic because of the multiple reheatings in high temperature.
34
VIEW
ML00102 / May.2018
AISI 4130 Forging Welded and Overlaid
M - Low Alloy SteelP - CladdingAp - Oil and GasCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
ML00100 — Superduplex Tubing to Forging Welded JointM - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Welding
Micrography of the tubing heat affected zone.
68
VIEW
ML00100 / Nov.2017
Superduplex Tubing to Forging Welded Joint
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Welding
Cm - NaOH Electrolytic Etched MicroDf - HAZ Left Side
Micrography of the forging heat affected zone.
41
VIEW
ML00100 / Nov.2017
Superduplex Tubing to Forging Welded Joint
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Welding
Cm - NaOH Electrolytic Etched MicroDf - HAZ Right Side
Micrography of the forging heat affected zone.
35
VIEW
ML00100 / Nov.2017
Superduplex Tubing to Forging Welded Joint
M - Super Duplex Stainless SteelP - Fabrication WeldAp - SubseaCd - Welding
Cm - NaOH Electrolytic Etched MicroDf - HAZ Right Side
ML00066 — GMAW Welded Joint in 9%Ni Alloy SteelM - Nickel Alloy SteelP - Welded Testpiece for QualificationAp - PipelineCd - Welding
Micrography of the heat affected zone, a little far from the fusion line, close to the base metal.
40
VIEW
ML00066 / May.2017
GMAW Welded Joint in 9%Ni Alloy Steel
M - Nickel Alloy SteelP - Welded Testpiece for QualificationAp - PipelineCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
Grain refined heat affected zone, in the center of the thickness.
23
VIEW
ML00066 / May.2017
GMAW Welded Joint in 9%Ni Alloy Steel
M - Nickel Alloy SteelP - Welded Testpiece for QualificationAp - PipelineCd - Welding
Cm - Nital Etched Micrography by OMDf - Heat Affected Zone
ML00045 — Subsea Tubular F6NM Martensitic SSM - Martensitic Stainless SteelP - Fabrication WeldAp - OffshoreCd - Welding
Micrographic detail of the heat-affected zone close to the fusion line.
31
VIEW
ML00045 / Aug.2017
Subsea Tubular F6NM Martensitic SS
M - Martensitic Stainless SteelP - Fabrication WeldAp - OffshoreCd - Welding
Cm - Kalling Etched Micrography by OMDf - Heat Affected Zone
Micrography of the heat-affected zone. The fusion line is in the right and the coarse structure of the base metal is refined at the heat affected zone.
28
VIEW
ML00045 / Aug.2017
Subsea Tubular F6NM Martensitic SS
M - Martensitic Stainless SteelP - Fabrication WeldAp - OffshoreCd - Welding
Cm - Kalling Etched Micrography by OMDf - Heat Affected Zone
ML00033 — Plasma Cut of 1 1/4" Steel PlateM - High Strength Low AlloyP - Rolled PlateAp - StructureCd - Cutting
Intercritical heating at 0.5 mm from the cut surface, showing martensitic islands.
32
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 - Heat Affected Zone
Intercritical heating at 0.5 mm from the cut surface, showing martensitic islands.
27
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 - Heat Affected Zone
Location of the microhardness tests. The three measurements at the plate base metal showed average hardness of 204 HV 50g. The three measurements of the martensitic structure at the surface showed average 454HV 50g. The intercritical region showed average 324 HV 50g.
25
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 - Heat Affected Zone