Optical Microscope

2 cases · 8 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Engine Detail focus: Martensite clear all

Optical Microscope — sub-branches

Nital Etched Micrography by OM 8

Results

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Micrography of the shaft very close to the surface, in a heat treated position. Graphite in nodules. Dark blue martensitic microstructure around the nodules, brown yellow martensite and white islands of martensitic with retained austenite microstructure.
65
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the shaft at the surface, in a region where a thermal spray layer was not applied. The microstructure at the shaft surface is martensitic (low carbon martensite) typical of a quenched and tempered condition for this low alloy steel. The heat treatment was probably conducted before the thermal spray layer was applied.
24
VIEW
ML00108 / Dec.2017
Thermal Spray Layer in a Pinion Shaft
M - High Strength Low AlloyP - ShaftAp - EngineCd - Coating Defect
Cm - Nital Etched Micrography by OMDf - Martensite

More from these cases

ML00154 — High Strength Cast Iron CrankshaftM - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Micrographic detail of the graphite in nodules, dark blue martensitic microstructure around the nodules, brown yellow martensite and white yellow islands of martensitic with retained austenite microstructure.
61
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the shaft below the heat treated surface. At this position, in the middle of the hardened layer , it is possible to see also white regions of ferrite, very close to the graphite nodules.
47
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by OMDf - Martensite
Micrographic detail of the hardened layer, presenting the graphite nodules, brown and yellow martensite regions and white areas of ferrite, close to the nodules.
46
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by OMDf - Martensite
Micrography of the shaft below the heat treated surface. At this position, close to the limit of the hardened layer , it is possible to see the brown yellow martensite and ferrite around the graphite nodules.
39
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by OMDf - Martensite
Micrographic detail of the brown yellow martensite and ferrite around the graphite nodules.
39
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by OMDf - Martensite
ML00108 — Thermal Spray Layer in a Pinion ShaftM - High Strength Low AlloyP - ShaftAp - EngineCd - Coating Defect
Micrographic detail of the shaft at the surface, in a region where a thermal spray layer was not applied. The microstructure is martensitic (low carbon martensite) typical of a quenched and tempered condition for this low alloy steel. The heat treatment was probably conducted before the thermal spray layer was applied.
29
VIEW
ML00108 / Dec.2017
Thermal Spray Layer in a Pinion Shaft
M - High Strength Low AlloyP - ShaftAp - EngineCd - Coating Defect
Cm - Nital Etched Micrography by OMDf - Martensite