NaOH Electrolytic Etched Micro

1 case · 5 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Microstructure: Austenite clear all

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SAMPLE 3 AT 4 mm THICKNESS - Micrography in low magnification in the center of the thickness. The microstructure is austenitic with secondary intergranular and intragranular precipitation, but this micrography was obtained in the longitudinal section, presenting the plate alignment and was etched with NaOH, adopted to colour the sigma phase .
40
VIEW
ML00160 / Apr.2020
High Temperature Degradation of 310SS
M - Austenitic Stainless SteelP - Rectangular TubeAp - Chemical IndustryCd - Scaling
Cm - NaOH Electrolytic Etched MicroDf - Low Mag

More from these cases

ML00160 — High Temperature Degradation of 310SSM - Austenitic Stainless SteelP - Rectangular TubeAp - Chemical IndustryCd - Scaling
SAMPLE 3 AT 4 mm THICKNESS - Micrography in the center of the thickness. The microstructure is austenitic with secondary intergranular and intragranular precipitation, but this micrography was obtained in the longitudinal section, presenting the plate alignment and was etched with NaOH, adopted to colour the sigma phase.
45
VIEW
ML00160 / Apr.2020
High Temperature Degradation of 310SS
M - Austenitic Stainless SteelP - Rectangular TubeAp - Chemical IndustryCd - Scaling
Cm - NaOH Electrolytic Etched MicroDf - Austenitic with Secondary Precipitation
SAMPLE 3 AT 4 mm THICKNESS - Micrographic detail of the material in the center of the thickness, longitudinal section. The microstructure is austenitic and the coloured phases are sigma, at austenitic grain boundaries.
44
VIEW
ML00160 / Apr.2020
High Temperature Degradation of 310SS
M - Austenitic Stainless SteelP - Rectangular TubeAp - Chemical IndustryCd - Scaling
Cm - NaOH Electrolytic Etched MicroDf - Sigma
SAMPLE 1 AT 1 mm THICKNESS, SIDE A - Micrographic detail of the austenite with secondary precipitation, close to the surface exposed to the process side. This NaOH electrolytic etch is colouring the sigma phase at austenite grain boundaries, creating cracks and grain detachemnt leading to quick thinning.
35
VIEW
ML00160 / Apr.2020
High Temperature Degradation of 310SS
M - Austenitic Stainless SteelP - Rectangular TubeAp - Chemical IndustryCd - Scaling
Cm - NaOH Electrolytic Etched MicroDf - Austenitic with Secondary Precipitation
SAMPLE 1 AT 1 mm THICKNESS, SIDE B - Micrographic detail of the austenite with secondary precipitation, close to the surface exposed to the furnace environment. This NaOH electrolytic etch is adopted to colour sigma phase and at this position there are no special formation of sigma in the grain boundaries and there are no oxide penetrations, confirming that the environment is important to create the damage and the internal side of the tube is responsible for the quick degradation in high temperature.
25
VIEW
ML00160 / Apr.2020
High Temperature Degradation of 310SS
M - Austenitic Stainless SteelP - Rectangular TubeAp - Chemical IndustryCd - Scaling
Cm - NaOH Electrolytic Etched MicroDf - At the Surface