Abstract
The phase equilibria of this quaternary system are of practical interest in the development of Cr-based corrosion and heat-resisting steels. It has been known for many years that N promotes the formation of austenite in Cr steels. This review presents isothermal sections for Fe-rich alloys in the temperature range of 1300 to 700 °C. They are at constant compositions of 30,24,18,12, and 7 wt. % Cr, sectioned parallel to the C-Fe-N base of the composition tetrahedron. A partial reaction scheme developed by [69Mas2] is given, relating the four-phase univariant reactions to the five-phase invariant reactions in the system. For the constituent binary and ternary systems, recent assessments are cited and a list of updated references is given. Selected phase diagrams of the constituent systems relevant to the reviewed quaternary data are given.
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Raghavan, V. C-Cr-Fe-N (carbon-chromium-iron-nitrogen). JPE 13, 119–129 (1992). https://doi.org/10.1007/BF02667472
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DOI: https://doi.org/10.1007/BF02667472