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  • Supersaturation of iron with nitrogen, hydrogen or carbon and the consequences
    Grabke, Hans Jürgen
    Reactions leading to supersaturation of iron with nitrogen, hydrogen or carbon are described and some of the consequences of the supersaturation. The formation of the thermodynamically stable state ... of the elements. N2(gas), H2(gas) and graphite from the supersaturated solid solutions may cause defects or even destruction of iron and steels. High nitrogen concentrations and instable nitrides are attained in flowing NH3-H2 mixtures, in a steady state where nitrogenation is fast but N2-desorption slow, the supersaturation leads to porosity by N2-formation in the metal or in the nitride layer. High hydrogen concentrations are established by the electrochemical reactions in pickling or by annealing at elevated temperatures, and may cause porosity in steels or blistering of coatings by H2-formation. Supersaturation with carbon occurs in nonequilibrium gas atmospheres, e.g. syngas CO-H2 and leads to disintegration of iron and steels by graphite formation, after cementite has formed as an intermediate. Parallels and similarities in these processes are pointed out.
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 38, št. 5, sep.-okt. 2004, str. 211-222)
    Vrsta gradiva - članek, sestavni del
    Leto - 2004
    Jezik - angleški
    COBISS.SI-ID - 361386

    Povezava(-e):

    Digitalna knjižnica Slovenije - dLib.si

vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 38, št. 5, sep.-okt. 2004, str. 211-222)

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