Controlled dissolution of colossal quantities of nitrogen in stainless steel

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    The solubility of nitrogen in austenitic stainless steel was investigated thermogravimetrically by equilibrating thin foils of AISI 304 and AISI 316 in ammonia/hydrogen gas mixtures. Controlled dissolution of colossal amounts of nitrogen under metastable equilibrium conditions was realized, with nitrogen contents as high as corresponding to an occupancy of yN = 0.61 of the interstitial sublattice, i.e. about 38 at.% N. Associated with the dissolution of these unprecedented nitrogen contents in an austenitic matrix a reversible volume expansion of the austenite lattice occurred for yN > 0.17. A simplistic model based on a statistical distribution of the nitride forming elements over the octahedrons constituting the solid state agrees favorably with the experimental data.
    Original languageEnglish
    JournalMetallurgical and Materials Transactions A
    Pages (from-to)675-682
    Publication statusPublished - 2006


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