Keller Etched Micrography by OM

3 cases · 15 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

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The wheel microstructure changed a little depending the thickness. In the region of WHEEL 1 fracture and WHEEL 2 cracking, it presented an alpha matrix with a networklike precipitates interdendritic.
46
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Keller Etched Micrography by OMDf - Hypoeutetic
Micrography of the cast rim, base metal, showing the dendrites of alpha aluminum and interdendritic eutectic Si/alpha, silicon particles in a coalesced condition that suggests a solution annealed treatment. After etching it is possible to identify a transgranular precipitation (aging) and a dark FeSiAl phase (neddles).
87
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Base Metal
Micrography of the cast Aluminum alloy (AlSnCuNi) typically adopted for bearing applications.
419
VIEW
ML00058 / Apr.2017
High-Pressure Piston Seal in Casting Al Alloy
M - Aluminum TinP - CastingAp - EnergyCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Casting Structure

More from these cases

ML00183 — Ductile Behavior of an Aluminum WheelM - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Detail of the alpha matrix with an eutectic networklike precipitates, interdendritic. Presence of acicular iron rich phases (dark gray).
51
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Keller Etched Micrography by OMDf - Networklike precipitates
Micrography transverse to the fracture surface of the WHEEL 1. The fracture is in the up right position of the photo and it can be observed a secondary cracking following the interdendritic precipitates.
33
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Keller Etched Micrography by OMDf - Radial Section
Micrographic detail of the secondary crack from the fracture surface of the WHEEL 1, following the interdendritic precipitates.
36
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Keller Etched Micrography by OMDf - Fracture
Dendritic branching structure of the aluminum matrix, with fine interdendritic features visible against a darker surrounding phase.
2
VIEW
ML00183 / Dec.2022
Ductile Behavior of an Aluminum Wheel
M - Aluminum Silicon MagnesiumP - CastingAp - AutomotiveCd - Ductile Behavior
Cm - Keller Etched Micrography by OMDf - Crack
ML00070 — Automotive Light Alloy Wheel Repaired By WeldingM - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Micrographic detail of the cast rim, base metal, showing the dendrites of alpha aluminum and interdendritic eutectic Si/alpha, silicon particles in a coalesced condition that suggests a solution annealed treatment. After etching it is possible to identify a transgranular precipitation (aging) and a dark FeSiAl phase (neddles).
62
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Base Metal
Low magnification micrography of the welded region, showing the base metal in the bottom, the fusion zone (between the liquidus and solidus temperatures) in the center and the weld metal in the top. There are pores close to the weld metal and in the fusion zone the interdendritic space was melted and the eutectic morphology was changed.
64
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Weld Repair
The cast material that presents for the base metal a coalesced silicon particles in the interdendritic space and intragranular precipitation shows a solution effect at the heat affected zone.
52
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Heat Affected Zone
The coalesced silicon particles in the interdendritic space of the base metal presents a remelting at the fusion zone.
44
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Fusion Line
The weld metal presents the same structure than the base metal (alpha aluminum dendrites with Si/Al alpha eutectic in the interdendritic space) but refined when compared to the base metal. Also the hardness level is higher for the weld metal than the base metal.
37
VIEW
ML00070 / Jan.2019
Automotive Light Alloy Wheel Repaired By Welding
M - Aluminum Silicon MagnesiumP - RimAp - AutomotiveCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Weld Metal
ML00058 — High-Pressure Piston Seal in Casting Al AlloyM - Aluminum TinP - CastingAp - EnergyCd - Removed From Service
Micrography of the cast Aluminum alloy (AlSnCuNi) typically adopted for bearing applications.
45
VIEW
ML00058 / Apr.2017
High-Pressure Piston Seal in Casting Al Alloy
M - Aluminum TinP - CastingAp - EnergyCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Casting Structure
Micrography of the cast Aluminum alloy (AlSnCuNi) typically adopted for bearing applications.
34
VIEW
ML00058 / Apr.2017
High-Pressure Piston Seal in Casting Al Alloy
M - Aluminum TinP - CastingAp - EnergyCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Casting Structure
Micrography of the cast Aluminum alloy (AlSnCuNi) typically adopted for bearing applications.
32
VIEW
ML00058 / Apr.2017
High-Pressure Piston Seal in Casting Al Alloy
M - Aluminum TinP - CastingAp - EnergyCd - Removed From Service
Cm - Keller Etched Micrography by OMDf - Casting Structure