Effects of additions of nickel nanoparticles on sintering response of PM hybrid low alloy steels

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DOIResolve DOI: http://doi.org/10.1179/1743290112Y.0000000033
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TypeArticle
Journal titlePowder Metallurgy
ISSN0032-5899
Volume56
Issue1
Pages4654; # of pages: 9
SubjectCarbon coated nickel nanoparticle; Conventional sintering; Heterogeneous microstructure; Homogeneous distribution; Microstructures and mechanical properties; Nickel nanoparticles; Volume diffusion coefficients; Wavelength dispersive X-rays; Diffusion; Grain boundaries; High strength steel; Iron powder; Mechanical properties; Nanoparticles; Nickel; Powder metallurgy; Sintering; Steel; Nickel powder metallurgy
AbstractAddition of pure elements to powder mixes can cause the formation of heterogeneous microstructures in powder metallurgy (PM) parts upon sintering. For instance, it has been shown that additions of nickel particles to an iron powder form nickel rich areas (NRAs), since nickel has low diffusivity in iron at conventional sintering temperature [∼1121°C (2050°F)]. Thus, the present work is aimed at determining if addition of a small quantity of carbon coated nickel nanoparticles to a PM hybrid low alloy steel premix could result in a more homogeneous distribution of nickel in sintered parts. It also characterises the effect of this addition on microstructures and mechanical properties. Grain boundary and volume diffusion coefficients of nickel nanoparticles have been determined using Suzuoka's equation and wavelength dispersive X-ray spectrometry maps. Results show that addition of nanoparticles initiates lattice diffusion at lower temperature and produces less NRA. © 2013 Institute of Materials, Minerals and Mining.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270691
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Record identifier126b71e4-1c83-4294-8a41-4287dc526d2b
Record created2014-02-17
Record modified2016-05-09
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