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M23C6 carbides and Cr2N nitrides in aged duplex stainless steel: A SEM, TEM and FIB tomography investigation.

Authors
  • Maetz, J-Y1
  • Douillard, T2
  • Cazottes, S2
  • Verdu, C2
  • Kléber, X2
  • 1 Université de Lyon, INSA de Lyon, MATEIS, UMR CNRS 5510, 69621 Villeurbanne Cedex, France. Electronic address: [email protected] , (France)
  • 2 Université de Lyon, INSA de Lyon, MATEIS, UMR CNRS 5510, 69621 Villeurbanne Cedex, France. , (France)
Type
Published Article
Journal
Micron (Oxford, England : 1993)
Publication Date
May 01, 2016
Volume
84
Pages
43–53
Identifiers
DOI: 10.1016/j.micron.2016.01.007
PMID: 26925831
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The precipitation evolution during ageing of a 2101 lean duplex stainless steel was investigated, revealing that the precipitate type and morphology depends on the nature of the grain boundary. Triangular M23C6 carbides precipitate only at γ/δ interfaces and rod-like Cr2N nitrides precipitate at both γ/δ and δ/δ interfaces. After 15min of ageing, the M23C6 size no longer evolves, whereas that of the Cr2N continues to evolve. For Cr2N, the morphology is maintained at γ/δ interfaces, whereas percolation occurs to form a continuous layer at δ/δ interfaces. By combining 2D and 3D characterisation at the nanoscale using transmission electron microscopy (TEM) and focused ion beam (FIB) tomography, a complete description of the precipitation evolution was obtained, including the composition, crystallographic structure, orientation relationship with the matrix phases, location, morphology, size and volume fraction. Copyright © 2016 Elsevier Ltd. All rights reserved.

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