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8 cases · 43 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Martensite Capture method: Scanning Electron Microscope clear all

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Fractographic image of the actual rod rupture, showing that the material fractured by an intergranular micromechanism, evidencing a tempered martensite embrittlement.
59
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Fractography by SEMDf - Intergranular Fracture
Even in a sound tooth there are regions of pitting, and foreign incrustation, probably caused by metal removal and high contact spots.
53
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface Aspect by SEMDf - Pitting
Aspect of the spring surface, with a layer of corroded products, and pits.
36
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Surface Aspect by SEMDf - Corrosion
The microscopic aspect of the internal side of the housing evidences the characteristics of the multiple cracks, not directly related to pitting corrosion.
41
VIEW
ML00093 / Sep.2017
MIC of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Cracks
Microscopic detail of the fracture surface in the position where the fracture is intergranular, probably due to the MIC attack creating an embrittled condition of the material.
31
VIEW
ML00080 / Sep.2017
MIC of Stacking Disc Springs
M - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Cm - Fractography by SEMDf - Intergranular Fracture
The fractography by SEM shows intergranular fracture close to the external surface of the pin.
93
VIEW
ML00009 / Sep.2017
Hydrogen Cracking of a 5" Drill Pipe S135
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Intergranular Cracking
Micrographic detail of the original casting blade structure. The tempered martensite is more clearly revealed by the scanning electron microscopy. The average hardness level measured in this side is 270 HV.
70
VIEW
ML00055 / Apr.2017
CA6NM Blade Remanufactured by Welding
M - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Cm - Kalling Etched Micrography by SEMDf - Base Metal Left Side
Martensitic structure at the cutting HAZ. Longitudinal section.
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 SEMDf - Martensite

More from these cases

ML00182 — Brittle Fracture of a LAS Fixing RodM - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Fractographic detail of the intergranular micromechanism, evidencing a tempered martensite embrittlement.
49
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Fractography by SEMDf - Intergranular Fracture
Fractographic detail of the intergranular micromechanism, evidencing a tempered martensite embrittlement.
44
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Fractography by SEMDf - Intergranular Fracture
Broken tensile testpiece fractography showing predominantly dimples as the fracture micromechanism, and some integranular aspects. It shows that in this uniaxial and without stress concentration raisers, the material presented a ductile behavior.
30
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Fractography by SEMDf - Broken Testpiece
Broken Charpy V testpiece fractography showing intergranular fracture micromechanism. It reveals the brittle material behavior when under critical conditions, like the one that was present in the service application (with a triaxial condition in the notch).
26
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Fractography by SEMDf - Broken Testpiece
ML00181 — Wear of a Carburized Hypoid GearM - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Aspect of the fractured tooth in a region presenting pitting, opening voids, and cracks.
51
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface Aspect by SEMDf - At the Surface
Aspect of the fractured tooth surface in a region presenting pitting, spalling and cracks.
42
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface Aspect by SEMDf - Spalling
Microscopic aspect of the cracks at the tooth surface. The cracks are flat and propagating longitudinally to the tooth (and secondary short transverse).
45
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Surface Aspect by SEMDf - Cracks
Microscopic aspect of the fracture, propagating by contact fatigue.
43
VIEW
ML00181 / Apr.2022
Wear of a Carburized Hypoid Gear
M - Low Alloy for Thermochemical TreatmentP - Pinion-crown assemblyAp - ShipCd - Wear
Cm - Fractography by SEMDf - Fatigue Fracture
ML00172 — Brittle Fracture of a LAS Valve SpringM - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Micrographic detail of the martensitic structure, clearly obtained from a refined previous austenitic structure .
19
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by SEMDf - Martensite
Micrographic detail of the martensitic structure.
19
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Nital Etched Micrography by SEMDf - Martensite
ML00093 — MIC of a Drilling ToolM - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Details of the pitting corrosion at the internal surface. There are cracks inside some pits.
31
VIEW
ML00093 / Sep.2017
MIC of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Cm - Surface Aspect by SEMDf - Pitting
The fracture micromechanism is intergranular in the region where the failure has iniciated.
22
VIEW
ML00093 / Sep.2017
MIC of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Cm - Fractography by SEMDf - Intergranular Fracture
Fractographic detail by SEM of the intergranular micromechanism in the region where the failure has iniciated.
25
VIEW
ML00093 / Sep.2017
MIC of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Cm - Fractography by SEMDf - Intergranular Fracture
The fracture micromechanism is transgranular by quasecleavage in the region where the failure has propagated.
21
VIEW
ML00093 / Sep.2017
MIC of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Cm - Fractography by SEMDf - Transgranular Fracture
Fractographic detail by SEM of the transgranular micromechanism by quasecleavage in the region where the failure has propagated.
21
VIEW
ML00093 / Sep.2017
MIC of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Heat Treated PartAp - O&G Well DrillingCd - Brittle Behavior
Cm - Fractography by SEMDf - Transgranular Fracture
ML00080 — MIC of Stacking Disc SpringsM - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Microscopic detail of the fracture surface in the position where the fracture is intergranular, probably due to the MIC attack creating an embrittled condition of the material. A surface film is evident in this position suggesting that the fracture remained open and exposed to the environment during a certain time before the failure was detected.
29
VIEW
ML00080 / Sep.2017
MIC of Stacking Disc Springs
M - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Cm - Fractography by SEMDf - Intergranular Fracture
Fracture micromechanisms. Intergranular fracture in the top of the figure (close to the groove) and transgranular fracture in the bottom of the figure, where the mechanism changed to transgranular by quasecleavage.
27
VIEW
ML00080 / Sep.2017
MIC of Stacking Disc Springs
M - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Cm - Fractography by SEMDf - Intergranular Fracture
Microscopic detail of the fracture surface where it is transgranular, by quasecleavage. This aspect is similar to the one expected for this high strenght material without any embrittlement.
27
VIEW
ML00080 / Sep.2017
MIC of Stacking Disc Springs
M - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Cm - Fractography by SEMDf - Transgranular Fracture
Microscopic detail of the fracture surface where it is transgranular, by quasecleavage. This aspect is similar to the one expected for this high strenght material without any embrittlement.
26
VIEW
ML00080 / Sep.2017
MIC of Stacking Disc Springs
M - Low Alloy Medium Carbon QTP - SpringAp - SubseaCd - Brittle Behavior
Cm - Fractography by SEMDf - Transgranular Fracture
ML00009 — Hydrogen Cracking of a 5" Drill Pipe S135M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Fractographic detail by SEM of the intergranular fracture close to the external surface of the pin.
83
VIEW
ML00009 / Sep.2017
Hydrogen Cracking of a 5" Drill Pipe S135
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Intergranular Cracking
The fractography by SEM shows quasecleavage mechanism in the middle of the wall thickness of the pin.
81
VIEW
ML00009 / Sep.2017
Hydrogen Cracking of a 5" Drill Pipe S135
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Transgranular Cracking
Fractographic detail by SEM of the quasecleavage mechanism in the middle of the wall thickness of the pin.
72
VIEW
ML00009 / Sep.2017
Hydrogen Cracking of a 5" Drill Pipe S135
M - Low Alloy Medium Carbon QTP - Drill PipeAp - SubseaCd - Hydrogen Embrittlement
Cm - Fractography by SEMDf - Transgranular Crack
ML00055 — CA6NM Blade Remanufactured by WeldingM - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Higher magnification of the martensitic structure of the original casting blade structure, hardness level of 270HV10.
26
VIEW
ML00055 / Apr.2017
CA6NM Blade Remanufactured by Welding
M - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Cm - Kalling Etched Micrography by SEMDf - Base Metal Left Side
Micrographic detail of the inserted casting structure. The martensite presents a less tempering aspect than the original casting revealing that it was heat treated in a different condition. The average hardness level measured in this side is 370 HV.
157
VIEW
ML00055 / Apr.2017
CA6NM Blade Remanufactured by Welding
M - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Cm - Kalling Etched Micrography by SEMDf - Base Metal Right Side
Higher magnification of the martensitic structure of the inserted casting structure, hardness level of 370HV10.
23
VIEW
ML00055 / Apr.2017
CA6NM Blade Remanufactured by Welding
M - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Cm - Kalling Etched Micrography by SEMDf - Base Metal Right Side
Micrographic detail of the original casting blade fusion line, presenting the tempered martensitic structure similar for the HAZ (left side of the figure) and the weld metal (right side of the figure).
20
VIEW
ML00055 / Apr.2017
CA6NM Blade Remanufactured by Welding
M - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Cm - Kalling Etched Micrography by SEMDf - Fusion Line Left Side
Micrographic detail of the original casting blade fusion line, presenting the tempered martensitic structure similar for the HAZ (left side of the figure) and the weld metal (right side of the figure).
20
VIEW
ML00055 / Apr.2017
CA6NM Blade Remanufactured by Welding
M - Martensitic Stainless SteelP - Remanufacture by WeldingAp - EnergyCd - Removed From Service
Cm - Kalling Etched Micrography by SEMDf - Fusion Line Left Side

+7 more from this case →

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.
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 SEMDf - Heat Affected Zone