Destructive Testing (DT)
Micro Analysis / Examination
Examining the specimen's microstructure (grain structure, phase precipitation) at 50–500X magnification.
Examination of an etched and/or unetched specimen at 50 to 500X magnification for detailed information about microstructure. Third-phase precipitation, excessive grain growth and grain orientation can be detected. An XJM 400 Series Inverted Metallurgical Microscope and an XTL Series Stereo Microscope are used.
Within this scope, we also determine the ferrite phase ratio by systematic manual point counting (ASTM E562): the volume fraction of the ferrite phase is determined statistically using a test grid placed over the etched specimen microstructure. Verifying the austenite-ferrite balance is critical in the quality control of duplex stainless steels in particular.
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