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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24226
Title: Nitride Dispersion Strengthened Steel Development after Sintering of Nitrided Fe-4.6 at% Al Alloy Powder
Authors: Yadav A.S.
Kürnsteiner P.
Jägle E.A.
Sasidhar K.N.
Meka, Sai Ramudu
Published in: Steel Research International
Abstract: The development of a composite microstructure with hard aluminum nitrides (AlN) dispersed in a soft ferritic iron-based solid is achieved through the powder metallurgy route. Fe-4.6 at% Al alloy powders subjected to two different thermochemical treatments viz. nitriding and nitriding followed by hydrogen reduction are consolidated by spark plasma sintering (SPS) at 900 °C. The final sintered microstructure is characterized with the help of optical, scanning electron, and transmission electron microscopy along with X-ray diffraction for detailed phase analysis. The microstructures of the nitrided and sintered compacts are observed to be significantly affected by two factors: 1) presence of oxide phases on the surface of the powder particles before SPS and 2) evolution of nitrogen gas due to dissociation of iron nitrides during sintering. These result in a very complicated microstructure. However, for nitrided powders, performing a hydrogen reduction step before SPS lead to a microstructure composed of precipitation-hardened particle cores due to dispersion of nanosized AlN precipitates, with a soft, ferritic interparticle region. This composite microstructure achieved through the powder metallurgy route, which can be finely tuned by controlling the nitriding, oxidation, and sintering parameters, is envisioned to be greatly beneficial for several engineering applications such as automotive components. © 2021 Wiley-VCH GmbH
Citation: Steel Research International, 92(11)
URI: https://doi.org/10.1002/srin.202100174
http://repository.iitr.ac.in/handle/123456789/24226
Issue Date: 2021
Publisher: John Wiley and Sons Inc
Keywords: aluminum nitride
ferritic iron.
nitride dispersion
spark plasma sintering
ISSN: 16113683
Author Scopus IDs: 57204354230
55540069000
36537444100
57194204113
24503463800
Author Affiliations: Yadav, A.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, 247667, India
Kürnsteiner, P., Department Microstructure Physics and Alloy Design, Max-Planck-Institutfür Eisenforschung GmbH, Düsseldorf, 40237, Germany, Christian Doppler Laboratory for Nanoscale Phase Transformations, Center of Surface and Nanoanalytics, Johannes Kepler University Linz, Altenberger Straße 69, Linz, 4040, Austria
Jägle, E.A., Department Microstructure Physics and Alloy Design, Max-Planck-Institutfür Eisenforschung GmbH, Düsseldorf, 40237, Germany, Institute of Materials Science, Universität der Bundeswehr München, Neubiberg, 85577, Germany
Sasidhar, K.N., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, 247667, India, Department Microstructure Physics and Alloy Design, Max-Planck-Institutfür Eisenforschung GmbH, Düsseldorf, 40237, Germany
Meka, S.R., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, 247667, India
Funding Details: The authors are grateful to Max Planck Institute for Intelligent Systems for providing us the Fe-4.6 at% Al alloy powder. The authors are thankful to BHEL, Haridwar, India for allowing us to perform nitriding experiments at their facility. The authors are also grateful to Max Planck Society, Germany for the financial support offered under the Max Planck Partner Group programme. The financial support by the Austrian Federal Ministry for Digital and Economic Affairs, the National Foundation for Research, Technology, and Development, and the Christian Doppler Research Association is gratefully acknowledged. National Foundation for Science and Technology Development, NAFOSTED; Max-Planck-Gesellschaft, MPG; Christian Doppler Forschungsgesellschaft, CDG; Bundesministerium für Digitalisierung und Wirtschaftsstandort, BMDW
Corresponding Author: Meka, S.R.; Department of Metallurgical and Materials Engineering, India; email: s.r.meka@mt.iitr.ac.in
Appears in Collections:Journal Publications [MT]

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