☆ 4.7 Article

Precipitation of σ-phase in high-nitrogen austenitic 18Cr-18Mn-2Mo-0.9N stainless steel during isothermal aging

SCRIPTA MATERIALIA (2004)

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Journal

SCRIPTA MATERIALIA
Volume 50, Issue 10, Pages 1325-1328

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2004.02.013

Keywords

stainless steels; precipitation; CALPHAD; nitrides; sigma (sigma)-phase

Categories

Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

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Precipitation mechanism of sigma-phase in austenitic high-nitrogen steel (HNS) upon aging was investigated using electron microscopy and thermodynamic calculation. The precipitation sequence was found to be grain boundary Cr2N, cellular Cr2N and sigma-phase with aging time. It was concluded that the nitrogen-depleted zone near Cr2N induces the nucleation of sigma-phase. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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