Mechanical alloying and severe plastic deformation of nanocrystalline high-nitrogen stainless steelsстатья
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Дата последнего поиска статьи во внешних источниках: 30 августа 2017 г.
Аннотация:Highnitrogen, nickelfree nanocrystalline stainless steels with Fe–(18–20)Cr–1N and Fe–(23–
25)Cr–(10–11)Mn–1N (wt %) compositions were obtained by mechanical alloying (MA) in a highenergy
planetary ball mill in an argon atmosphere. As a source of nitrogen, we used chromium and manganese
nitrides that enter the composition of the powder mixture with pure metal components. Comparative studies
of the evolution of the structure during MA using Xray diffraction, Mössbauer spectroscopy, and transmis
sion and scanning electron microscopy have demonstrated that, in an Fe–Cr–N system, a ferrite bcc struc
ture is preserved for up to 120 h of MA. In an Fe–Cr–Mn–N system, where nitrogen was supplied by chro
mium nitrides, complete austenization occurred after 60 h of the MA. The maximum acceleration of the for
mation kinetics of a highnitrogen austenite was obtained in an Fe–Cr–Mn–N system, where nitrogen was
obtained from a manganese nitride. The mechanisms of solidphase reactions in powder mixtures during MA
are discussed under both the deformationinduced dissolution of nitrides in a metallic matrix and the stability
of a nitrogensupersaturated ferrite with respect to α → γ transformation.