Microstructure

2 cases · 2 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Product: Casting Capture method: Micrography by SEM clear all

Microstructure — sub-branches

Fusion Line 1Intragranular Secondary Precipitation 1

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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
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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