Low Alloy Medium Carbon QT

5 cases · 24 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: O&G Well Drilling Capture method: As polished micrography clear all

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Drill Pipe Fracture in the Pipe Body
2
VIEW
ML00169 / Nov.2020
Drill Pipe Fracture in the Pipe Body
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - As polished micrographyDf - External Surface
Micrography in low magnification, as polished, of the crack in the the repair weld metal, showing the dendritic aspect of the hot cracks, formed during welding due to the high content of impurities in a high strength weld metal.
26
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - As polished micrographyDf - Hot cracking
Micrography, as polished, of the transverse section of the forged pin with the layer applied by a (thermal) spray and fuse process. The layer presented entrapped pores and globular oxides. It was melted after application by thermal spray (in this case using a flame) but the pin was not heat treated after the full application and melting of the layer and the base metal is ferritc-pearlitic.
51
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Transverse Section
Micrography, as polished, of the transverse section of the forged pin with the layer applied by a (thermal) spray and fuse process. The structure of the layer that is 0.7 mm thick, presented entrapped pores and globular oxides. The layer was melted after application by thermal spray (in this case using a flame) and the pin was quenched and tempered after the full application and melting of the layer.
360
VIEW
ML00109 / Jan.2018
Thermal Spray and Fuse Layer in Forged Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Thermal spray
Cm - As polished micrographyDf - Transverse Section
As polished micrography of the external surface of the tubular equipment, close to the fracture position (it is to the top of the figure), showing corrosion fatigue cracks. These are multiple cracks, paralel to the main fracture, slightly branched and fully filled with oxides.
51
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - As polished micrographyDf - Multiple cracks

More from these cases

ML00169 — Drill Pipe Fracture in the Pipe BodyM - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Corrosion Fatigue
Drill Pipe Fracture in the Pipe Body
2
VIEW
ML00169 / Nov.2020
Drill Pipe Fracture in the Pipe Body
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - As polished micrographyDf - External Surface
Drill Pipe Fracture in the Pipe Body
2
VIEW
ML00169 / Nov.2020
Drill Pipe Fracture in the Pipe Body
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - As polished micrographyDf - Internal Surface
Drill Pipe Fracture in the Pipe Body
3
VIEW
ML00169 / Nov.2020
Drill Pipe Fracture in the Pipe Body
M - Low Alloy Medium Carbon QTP - Drill PipeAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - As polished micrographyDf - Internal Surface
ML00162 — Valve Body Crack Growth from Weld DefectsM - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Micrography, as polished, of the hot cracks with rounded morphology.
27
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - As polished micrographyDf - Hot cracking
Micrographic detail, as polished, of the hot cracks with rounded interdenritic morphology.
26
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - As polished micrographyDf - Hot cracking
Micrography in low magnification, as polished, of the crack in the valve thickness, showing the straight aspect of the fatigue propagation.
24
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - As polished micrographyDf - Fatigue Crack
Micrography, as polished, of the crack in the valve thickness, showing the straight aspect of the fatigue propagation.
22
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - As polished micrographyDf - Fatigue Crack
Micrographic detail of the straight crack that propagated by a fatigue mechanism.
18
VIEW
ML00162 / Apr.2020
Valve Body Crack Growth from Weld Defects
M - Low Alloy Medium Carbon QTP - Valve BodyAp - O&G Well DrillingCd - Fatigue Induced by a Defect
Cm - As polished micrographyDf - Fatigue Crack

+2 more from this case →

ML00110 — Non Conformance in Spray and Fuse PinM - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Micrography, as polished, of the transverse section of the forged pin with the layer applied by a (thermal) spray and fuse process. The layer was melted after thermal spray application and the layer presents a continuous matrix, but there are globular oxides and pores entrapped.
36
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Surface Layer
Micrographic detail, as polished, of the transverse section of the forged pin at the interface between the pin and the spray and fuse layer. The interface presents globular oxides and small pores, entrapped.
35
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Surface Layer
Low magnification micrography of the interface between the pin and the spray and fuse layer. Close to the surface, under the layer, the pin presents a ferritic perlitic structure, non conform with the high strenght requirement. Transverse section.
37
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Low Mag
Micrography, as polished, of the transverse section of the forged pin, showing a crack in the thermal spray layer, thickness about 0.8mm. The spray and fuse process was conducted in a low alloy steel, type AISI 4130, but the quenching and tempering heat treatment was not applied later, and the pin body presented low strenght, evidencing plastic deformation after hydrostatic testing, that cause the layer cracking.
22
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Cracks Transverse to the Surface
Micrographic detail of the crack in the thermal spray layer. The spray and fuse layer presented a typically melted structure with entrapped pores and globular oxides.
29
VIEW
ML00110 / Jan.2018
Non Conformance in Spray and Fuse Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Heat Treatment Defect
Cm - As polished micrographyDf - Crack

+1 more from this case →

ML00109 — Thermal Spray and Fuse Layer in Forged PinM - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Thermal spray
Micrography, as polished, of the transverse section of the forged pin with the layer applied by a (thermal) spray and fuse process. The layer was melted after thermal spray application and the layer presents a continuous matrix, but there are globular oxides and pores entrapped.
29
VIEW
ML00109 / Jan.2018
Thermal Spray and Fuse Layer in Forged Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Thermal spray
Cm - As polished micrographyDf - Surface Layer
Micrographic detail, as polished, of the transverse section of the forged pin at the interface between the pin and the spray and fuse layer. The pin was heat treated after the thermal spray, and fuse treatment. The interface presents a higher concentration of globular oxides and pores, entrapped.
23
VIEW
ML00109 / Jan.2018
Thermal Spray and Fuse Layer in Forged Pin
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Thermal spray
Cm - As polished micrographyDf - Surface Layer
ML00082 — Corrosion Fatigue of a Drilling ToolM - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
As polished micrography of the external surface of the tubular equipment, close to the fracture position (it is to the top of the figure), showing corrosion fatigue cracks. These are multiple cracks, paralel to the main fracture, slightly branched and fully filled with oxides.
43
VIEW
ML00082 / Dec.2017
Corrosion Fatigue of a Drilling Tool
M - Low Alloy Medium Carbon QTP - Tubular ForgingAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - As polished micrographyDf - Multiple cracks