PHASE-EQUILIBRIA IN THE FE-CR-NI AND FE-CR-C SYSTEMS

Phase equilibria in selected phase regions of the Fe-Cr-Ni and Fe-Cr-C systems were investigated at the temperatures 795-degrees-C, 900-degr ees-C and 1000-degrees-C. The fcc/bcc, fcc/(sigma phase) phase equilib ria in Fe-Cr-Ni system and fcc/bcc/M23C6, fcc/M7C3/M23C6, bcc/M23C6 ph ase equilibria in Fe Cr-C system were investigated. The wavelength dis persive microanalysis for bulk specimens, carbon layer extraction tech nique for carbide composition analysis, and electron diffraction phase identification on foils were applied. The new information concerning fcc/(sigma phase) phase region of the Fe-C-Ni system at 900-degrees-C is presented and the precision to M23C6 carbide equilibria in the Fe-C r-C system at 1000-degrees-C is given.