This Application Note describes a study of heat affected X2CrNi18-10 stainless steel. Small chromium carbide
particles form at the grain boundaries of the material, causing chromium depletion of the surrounding matrix
and thus promoting corrosion.

A thin lamella was prepared at a grain boundary and analyzed with scanning transmission electron microscopy (STEM) and energy dispersive spectroscopy (EDS) by a ZEISS FIB-SEM instrument.

The EDS results obtained on the lamella show a spatial resolution of the order of 10 nm and allow the extent of the chromium depletion to be qualitatively determined.