A thermodynamic analysis of stable and metastable equilibria in Fe-Mn-C alloysстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Thermodynamic calculations and an analysis of phase transitions and reactions in the Fe-Mn-C system were performed taking into account all the possible stable and metastable states. Special attention was given to the concentration-temperature range of the existence of cementite-type carbides responsible for metal dusting. It was found that, at the temperature most characteristic of this transformation (873 K), cementite with the complex composition (Fe1 − y Mn y )3C was a stable phase. An increase in temperature to 973 K slightly narrowed and deformed the region of (Fe1 − y Mn y )3C stability. According to the results obtained, it was likely possible to create iron based metallic materials at manganese concentrations increased to 8–12 wt % stable toward destruction in active hydrogen- and carbon-containing gas media. This conclusion was substantiated experimentally.