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Abstract

The composition and crystallography of small nitride precipitates in a 17Cr–12.5Ni low-carbon austenitic stainless steel, containing 0·5 at.-% V + Nb and 0·4 at.-%N, have been studied using atom-probe field-ion microscopy and transmission electron microscopy. Precipitates resulting from static aging at 750°C for 8,100, or 1170 h were all found to contain N, V, Nb, and Cr, and small amounts of Fe and C. The stoichiometry, close to MX_0·5, remained almost constant, but the Nb content decreased and the V and Cr contents increased with longer aging times. Electron diffraction showed that the precipitates analysed had the fcc NaCI structure, but with a superlattice with a lattice parameter (a =0·838±0.004 nm) twice as large as that of the subcell. The appearance of the long-range-ordered MX_0·5 phase, its relationship to other phases, and the compositional changes occurring during aging are discussed and compared with earlier observations.

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Composition and crystallography of nitride precipitates in an austenitic stainless steel containing niobium and vanadium

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