Medium Carbon Steel

4 cases · 39 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

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Micrographic detail of the forging lap defect that appears at the nut surface like a crack, filled with oxides. The nut presented a martensitic structure in the center of the nut, but in the regions adjacent to the defect the structure is ferritic-bainitic due to decarburization. There are several globular oxides (grey spots) that became entrapped during the forging.
654
VIEW
ML00099 / Jan.2018
Forging Defect in a Cadmium Plated Nut
M - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Cm - Nital Etched Micrography by OMDf - Crack
The shaft presented a light wear at the end of the life. See the schematic drawing in the next figure
598
VIEW
ML00064 / Apr.2017
SAE 1045 Steel Shaft
M - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Cm - Aspect Before AnalysisDf - At the Surface
Pin A micrography presenting a ferritic-perlitic structure.
463
VIEW
ML00048 / Apr.2017
Medium Carbon Steel Pins of Electrical Insulators
M - Medium Carbon SteelP - Forged PinAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
The tooth contact surface of the SPUR RACK shows adhesive wear damage after a short time in service.
501
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Aspect Before AnalysisDf - Metal to Metal Wear

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ML00099 — Forging Defect in a Cadmium Plated NutM - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Micrography of the nut in a section transverse to the surface indication. There are several microcracks (parallel and perpendicular to the nut surface) filled with oxides. The nut presented a martensitic microstructure in the center of the thickness and a ferritic-bainitic microstructure at surface and adjacent to the defect, due to decarburization occurred during high temperature forging.
130
VIEW
ML00099 / Jan.2018
Forging Defect in a Cadmium Plated Nut
M - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Cm - Nital Etched Micrography by OMDf - Crack
The general aspect of the 1 1/8" 2H nut, presenting rejectable indications that appear like cracks, located in the face and in the lateral side of the nut.
46
VIEW
ML00099 / Jan.2018
Forging Defect in a Cadmium Plated Nut
M - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Cm - Aspect Before AnalysisDf - General View
Aspect in detail of the 1 1/8" 2H nut face, presenting rejectable indications that appear like cracks.
49
VIEW
ML00099 / Jan.2018
Forging Defect in a Cadmium Plated Nut
M - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Cm - Aspect Before AnalysisDf - Lap
The general aspect of the lateral side of the 1 1/8" 2H nut, presenting a rejectable indication that looks like a straight crack.
48
VIEW
ML00099 / Jan.2018
Forging Defect in a Cadmium Plated Nut
M - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Cm - Aspect Before AnalysisDf - Lap
Micrographic detail of the lap at the nut surface, as polished. The 20 microns cadmium layer is evident, penetrating in the lap.
46
VIEW
ML00099 / Jan.2018
Forging Defect in a Cadmium Plated Nut
M - Medium Carbon SteelP - NutAp - PipingCd - Fabrication Defect
Cm - As polished micrographyDf - Lap

+2 more from this case →

ML00064 — SAE 1045 Steel ShaftM - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Schematic drawing presenting the Shaft
169
VIEW
ML00064 / Apr.2017
SAE 1045 Steel Shaft
M - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Cm - Identification drawingDf - At the Surface
Micrography of the longitudinal section of the shaft, in the center of the thickness, presenting a ferritic-perlitic structure typical of a hot forming process.
149
VIEW
ML00064 / Apr.2017
SAE 1045 Steel Shaft
M - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrographic detail of the ferritic-perlitic structure, typical of a hot forming process, in the center of the thickness.
139
VIEW
ML00064 / Apr.2017
SAE 1045 Steel Shaft
M - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrographic detail of the ferritic-perlitic structure, typical of a hot forming process, in the center of the thickness.
116
VIEW
ML00064 / Apr.2017
SAE 1045 Steel Shaft
M - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - In the Center of the Thickness
Micrography of the longitudinal section of the shaft, at the damaged surface (with a light wear). In low magnification the ferritic perlitic texture reveals the forging lines.
102
VIEW
ML00064 / Apr.2017
SAE 1045 Steel Shaft
M - Medium Carbon SteelP - ShaftAp - Mechanical IndustryCd - Removed From Service
Cm - Nital Etched Micrography by OMDf - At the Surface

+1 more from this case →

ML00048 — Medium Carbon Steel Pins of Electrical InsulatorsM - Medium Carbon SteelP - Forged PinAp - EnergyCd - Typical manufacturing
Detail of Pin A microstructure. Ferritic-perlitic.
138
VIEW
ML00048 / Apr.2017
Medium Carbon Steel Pins of Electrical Insulators
M - Medium Carbon SteelP - Forged PinAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
Pin B micrography presenting a ferritic-bainitic structure.
97
VIEW
ML00048 / Apr.2017
Medium Carbon Steel Pins of Electrical Insulators
M - Medium Carbon SteelP - Forged PinAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Ferrite and Bainite
Detail of Pin B microstructure. Ferritic-bainitic.
87
VIEW
ML00048 / Apr.2017
Medium Carbon Steel Pins of Electrical Insulators
M - Medium Carbon SteelP - Forged PinAp - EnergyCd - Typical manufacturing
Cm - Nital Etched Micrography by OMDf - Ferrite and Bainite
ML00027 — Adhesive Wear of Spur Gear RackM - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
The macrography of the transverse tooth section of the SPUR GEAR shows that the surface is not hardened by any process or treatment.
105
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - NItal Etched MacroDf - Non Hardened Surface
A detail of the macrography, by stereoscope, of the SPUR RACK shows strong plastic deformation at the contact surface.
88
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - NItal Etched MacroDf - Plastic Deformation
SPUR RACK ferritic perlitic microstructure in the center of the tooth.
89
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR RACK ferritic perlitic microstructure in the center of the tooth.
77
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite
SPUR RACK ferritic perlitic microstructure in the center of the tooth.
67
VIEW
ML00027 / Apr.2017
Adhesive Wear of Spur Gear Rack
M - Medium Carbon SteelP - Spur GearAp - Mechanical IndustryCd - Adhesive Wear
Cm - Nital Etched Micrography by OMDf - Ferrite and Pearlite

+14 more from this case →