Scanning Electron Microscope

5 cases · 12 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Product: Casting Detail focus: Microstructure clear all

Scanning Electron Microscope — sub-branches

Fractography by SEM 1Micrography by SEM 2Nital Etched Micrography by SEM 9

Results

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Micrographic detail, by scanning electron microscopy, of the graphite in nodules and a ferritic-pearlitic matrix.
32
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by SEMDf - Graphite in Nodules
Micrography of the longitudinal section of the cylinder, at the external diameter (right side of the figure), presenting smaller interdendritic graphite flakes in a ferritic-perlitic matrix. This surface is painted.
32
VIEW
ML00141 / Jul.2018
Brittle Fracture of a Corroded Gray Cast Iron
M - Gray Cast ironP - CastingAp - EngineCd - Brittle Fracture
Cm - Nital Etched Micrography by SEMDf - Graphite in Flakes
Micrography of the casting at the surface, presenting a zinc layer deposited in a hot dip process. The thickness of the layer is about 0.3mm in this position, that is higher than expected for this process. The steel substrate is not revealed because the etch was light and the zinc layer protects the low aloy steel during the etch.
93
VIEW
ML00138 / Jun.2018
Liquid Metal Embrittlement of a HSLA Steel
M - High Strength Low AlloyP - Coated ProductAp - Mechanical IndustryCd - Liquid Metal Embrittlement
Cm - Nital Etched Micrography by SEMDf - Zn Layer
The coalesced silicon particles in the interdendritic space of the base metal presents a remelting at the fusion zone. The micrography by SEM shows the exactly line where the eutectic is remelted and refined. Keller etch.
40
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Micrography by SEMDf - Fusion Line
Micrography of the blade, view inside the grain. The intragranular precipitation presents one unique size of precipitation, not yet coalesced, although the blade was in high temperature service for 50.000 hours. Etched by H2SO4 + HNO3 + H3PO4 reagent.
66
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - Micrography by SEMDf - Intragranular Secondary Precipitation

More from these cases

ML00154 — High Strength Cast Iron CrankshaftM - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Micrographic detail by scanning electron microscopy, Nital etched, of the ferrite microstructure around a graphite nodule.
30
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by SEMDf - Ferrite and Pearlite
Micrographic detail of the pearlite in the matrix.
29
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by SEMDf - Pearlite
Micrography of the shaft at the surface in a heat treated position. The graphite nodule is degradating due to temperature and adjacent the microsctructure is martensitic.
27
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by SEMDf - Graphite in Imperfect Nodules
Micrographic detail of the graphite nodule surrounded by martensite.
30
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by SEMDf - Martensite
Micrographic detail of the martensite.
32
VIEW
ML00154 / Jan.2019
High Strength Cast Iron Crankshaft
M - Nodular Cast IronP - CastingAp - EngineCd - Surface treatment
Cm - Nital Etched Micrography by SEMDf - Martensite

+1 more from this case →

ML00138 — Liquid Metal Embrittlement of a HSLA SteelM - High Strength Low AlloyP - Coated ProductAp - Mechanical IndustryCd - Liquid Metal Embrittlement
Scanning electron fractography (originally 500x), showing zinc deposits at the fracture surface.
73
VIEW
ML00138 / Jun.2018
Liquid Metal Embrittlement of a HSLA Steel
M - High Strength Low AlloyP - Coated ProductAp - Mechanical IndustryCd - Liquid Metal Embrittlement
Cm - Fractography by SEMDf - Zn Layer