Characterization of nickel diffusion and its effect on the microstructure of nickel PM steels

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DOIResolve DOI: http://doi.org/10.1007/s11661-012-1417-9
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TypeArticle
Journal titleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
ISSN1073-5623
Volume44
Issue2
Pages754765; # of pages: 12
SubjectConcentration maps; Diffusion mechanisms; Grain-boundary diffusion; Heterogeneous microstructure; Microstructures and properties; Sintered parts; Volume diffusion coefficients; Wavelength dispersive X-rays; Diffusion; Grain boundaries; Microstructure; Nickel powder metallurgy; Powder metallurgy; Steel; Nickel
AbstractAdmixing pure elements to powder mixes can cause the formation of heterogeneous microstructures in sintered parts. For instance, nickel is renowned for forming nickel-rich areas (NRA) in powder metallurgy (PM) nickel steels due to its poor diffusivity in iron matrix (or lattice). The present work is aimed at characterizing the principal diffusion mechanisms of nickel and their influence on microstructures and properties of PM nickel steels. A new wavelength dispersive X-ray spectrometry (WDS) approach linking line scans and X-ray maps to concentration maps is proposed. Grain boundary and volume diffusion coefficients of admixed nickel have been determined in PM nickel steels using Suzuoka's equation. Results also show that nickel distributes itself in the iron matrix mainly by surface and grain boundary diffusion. © 2012 The Minerals, Metals & Materials Society and ASM International.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270529
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Record identifierb2e97fcd-17b9-4304-b480-6d2cc22913bc
Record created2014-02-17
Record modified2016-05-09
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