Microstructure

24 cases · 95 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Subsea clear all

Microstructure — sub-branches

Acicular Alpha 1Austenite 18Banded Structure 5Coarse Structure 3Coating Layer 2Dual grain sizes 1Duplex structure 5Equiaxial Grains 2Ferrite and Austenite 5Fusion Line 6Grain refined structure 2Martensite 22Sigma 7Strain Hardened 12Two phases 3Uniform Structure 1

Results

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Micrographic detail of the quenched and tempered martensitic structure of the pin tool joint.
83
VIEW
ML00088 / Dec.2017
Hydrogen Cracking of an API 5D S135 Drill Pipe
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the bolt in the longitudinal section, showing a tempered martensitic structure, slightly banded.
97
VIEW
ML00077 / Jun.2018
Hydrogen Cracking of LAS Subsea Bolts
M - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Nital Etched Micrography by OMDf - Banded Structure
The stud presents an austenitic structure, with primary and secondary precipitates of a size that is visible in low magnification microscopy.
55
VIEW
ML00075 / Jun.2018
Hydrogen Cracking of IN 718 Subsea Fasteners
M - NiCrFe AlloyP - StudAp - SubseaCd - Hydrogen Embrittlement
Cm - Kalling Etched Micrography by OMDf - Austenite
Micrographic aspect of the aged martensite structure of the 17-4 PH bolt, about 37 HRc.
94
VIEW
ML00074 / Jun.2018
Hydrogen Cracking of a 17-4 PH Subsea Bolt
M - Precipitation Hardened Stainless SteelP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Kalling Etched Micrography by OMDf - Martensite
Tempered martensitic structure of a longitudinal section of the fastener. Slightly banded material. Hardness level about 42 HRc.
59
VIEW
ML00073 / Jun.2018
Hydrogen Cracking of a LAS Subsea Fastener
M - Low Alloy Medium Carbon QTP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the fusion line of the second pass (not reheated). The HAZ is bainitic and the weld metal presents columnar grains (of the previous austenite).
61
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - NItal Etched MacroDf - Fusion Line
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

More from these cases

ML00075 — Hydrogen Cracking of IN 718 Subsea FastenersM - NiCrFe AlloyP - StudAp - SubseaCd - Hydrogen Embrittlement
The stud structure evidences grain boundaries precipitation of probably delta phase (an overaging of the hardening precipitate).
49
VIEW
ML00075 / Jun.2018
Hydrogen Cracking of IN 718 Subsea Fasteners
M - NiCrFe AlloyP - StudAp - SubseaCd - Hydrogen Embrittlement
Cm - Kalling Etched Micrography by OMDf - Austenite
ML00074 — Hydrogen Cracking of a 17-4 PH Subsea BoltM - Precipitation Hardened Stainless SteelP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Micrographic detail of the aged martensite structure of the 17-4 PH bolt, about 37 HRc.
73
VIEW
ML00074 / Jun.2018
Hydrogen Cracking of a 17-4 PH Subsea Bolt
M - Precipitation Hardened Stainless SteelP - FastenerAp - SubseaCd - Hydrogen Embrittlement
Cm - Kalling Etched Micrography by OMDf - Martensite
ML00053 — SAW Longitudinal Seam of X70 PipeM - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Micrographic detail of the fusion line of the second pass (not reheated). The HAZ is bainitic and the weld metal microstructure is predominantly formed by acicular ferrite.
51
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - Nital Etched Micrography by OMDf - Fusion Line
Fusion line of the first pass (reheated in high temperature). The HAZ is bainitic and the weld metal microstructure is predominantly formed by acicular ferrite.
43
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - Nital Etched Micrography by OMDf - Fusion Line
Micrographic detail of the fusion line of the first pass (reheated in high temperature). The HAZ is bainitic and the weld metal microstructure is predominantly formed by acicular ferrite.
37
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - Nital Etched Micrography by OMDf - Fusion Line
Micrographic detail of the fusion line of the first pass (reheated in high temperature). The HAZ is bainitic and the weld metal microstructure is predominantly formed by acicular ferrite.
38
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - Nital Etched Micrography by OMDf - Fusion Line
Micrographic detail of the fusion line of the second pass (not reheated). Bainitic HAZ and acicular ferrite in the weld metal.
45
VIEW
ML00053 / Mar.2017
SAW Longitudinal Seam of X70 Pipe
M - Microalloyed SteelP - Longitudinal Seam Welded PipeAp - SubseaCd - Welding
Cm - Nital Etched Micrography by OMDf - Fusion Line
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.
47
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