Observation of a Phase with the β-Manganese Structure Precipitatcd in a 25%Cr-28%Ni-2%Mo-0.31%N Austenitic Steel by Electron Probe Microanalysis

Abstract

Two types of phases precipitated in a 25%Cr-28%Ni-2%Mo-0.31%N austenitic steel aged for 2000 hr at 850°C were examined by electron probe microanalysis. One of the phases was identified as a nitride with the β-manganese structure, while the other has been known to be a dichromium nitride, Cr₂N. A clear distinction between the β-manganese type nitride and Cr₂N could be made from the back scattered electron image.