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2 cases · 7 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Pb Inclusions Capture method: Scanning Electron Microscope clear all

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Aspect of the coaster surface grooves, by scanning electron microscopy in a low magnification, showing in the right side the flat region that serves as a support; and in the left side the decorative grooves. The smooth surface in the groove suggests that the coasters were manufactured by casting.
66
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
The fracture micromechanism is ductile for the pin that has been sheared in a condition of controlling the load carrying. Elongated Dimples.
453
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - Fractography by SEMDf - Elongated Dimples

More from these cases

ML00156 — Antique Silver Plated Decorative PieceM - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Detail of the previous photo showing the flat surface in the right side and the grooves in the left side. The flat side is scratched and the grooves presented a smooth finishing (with dendritic morphology).
57
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
Detail of the flat scratched region of the coaster surface. The dark grey "nodules" are lead (Pb) base inclusions.
50
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
Detail of the groove region, showing a typical casting morphology at the surface: smooth and presenting a dendritic aspect with interdendritic shrinkage. Some dark grey "nodules" with Pb inclusions are also observed.
51
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - At the Surface
There are some regions in the coaster surface where pores associated to shrinkage is evident.
49
VIEW
ML00156 / Jan.2020
Antique Silver Plated Decorative Piece
M - BrassP - Decorative PieceAp - OrnamentalCd - Non Destructive Examination
Cm - Surface Aspect by SEMDf - Casting defects
ML00007 — Free Machining Brass in Shear PinM - BrassP - Machined PartAp - LiftingCd - Shear
The fracture surface is ductile and the micromechanism is dimples, elongated due to the shearing action.
83
VIEW
ML00007 / Dec.2020
Free Machining Brass in Shear Pin
M - BrassP - Machined PartAp - LiftingCd - Shear
Cm - Fractography by SEMDf - Ductile Fracture