Analiza karbidnih in nitridnih precipitatov v jeklu X20CrMoV121 z visoko ločljivo spektroskopijo Augerjevih elektronov (HR AES) = Investigation of carbide and nitride precipitates in steel X20CrMoV 121 by high resolution Auger electron spectroscopy (HR AES)
Jekla za termoenergetske naprave imajo med 0,1 in 0,2% C, zato je v njih po eksploataciji v temperaturnem razponu od 500 do 600°C praktično ves ogljik vezan v karbidno fazo oziroma v precipitate. ...Precipitati so spočetka cementit (▫$Fe_3C$▫), sčasoma pa v visokokromovih jeklih nastaja karbid ▫$M_23C_6$▫, v katerem so na kationskem mestu M krom, železo in molibden. Karbidi vrste MC nastanejo, če jeklo vsebuje vanadij, niobij, titan, molibden ali volfram, in sicer počasneje, ker je teh elementov manj in počasi difundirajo. Nitridi, ki precipitirajo med eksploatacijo in vsebujejo predvsem titan, vanadij in nioboij, so zaradi majhne količine za utrditev jekla manj pomembni od karbidov.
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