Abstract
Duplex microstructures of iron-base superalloys, consisting of an austenitic matrix and a M7C3 carbide, can be produced within the Fe-Mn-Cr-Mo-Al (Si)-C systems. The stability regions of the carbides were inspected by means of isothermal sections of alloys in the quinary combination Fe-Mn-Cr-Mo-C for 70 at% metal and 30 at % carbon. For 35 at % iron the competing carbides are found to be M2C, M3C and the molybdenum cementite (MoFe2C) in the arc-melted state, with M23C6 in the annealed state. In the quaternary system, Fe-Mn-Mo-C, a M2C carbide forms, presumaby derived from a solid solution carbide, (Mn, Mo)2C. In extracted carbides of cast alloys containing Fe-Mn-Cr-Mo-Al (Si)-C a considerable amount of the π-phase carbide occurs.
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Lemkey, F.D., Gupta, H., Nowotny, H. et al. Carbides in iron-rich Fe-Mn-Cr-Mo-Al-Si-C systems. J Mater Sci 19, 965–973 (1984). https://doi.org/10.1007/BF00540467
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DOI: https://doi.org/10.1007/BF00540467