Alloying element nitride stability in iron-based alloys; denitriding of nitrided Fe–V alloys |
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| Authors: | T Steiner S R Meka H Göhring E J Mittemeijer |
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| Affiliation: | 1. Max Planck Institute for Intelligent Systems (formerly MPI for Metals Research), Heisenbergstrasse 3, 70569 Stuttgart, Germany;2. Robert Bosch GmbH Heat Treatment Processes and Heat Treatment Technology (CR/APM4), Postbox 300240, 70442 Stuttgart, Germany;3. Current address: Metallurgical and Materials Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247667, India;4. Institute for Materials Science, University of Stuttgart, Heisenbergstrasse 3, 70569 Stuttgart, Germany |
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| Abstract: | Recognising the various types of absorbed nitrogen in nitrided iron-based alloys and the lack of accuracy in local composition analysis of the individual nano-sized nitride precipitates (e.g. by atom probe tomography), precise determination of the nitride composition requires so-called denitriding treatments. This study proposes two routes to determine the nanonitride stoichiometry, which are demonstrated by experimental analysis of the denitriding behaviour in hydrogen gas of nitrided, model Fe–V alloys. The minimal nitrogen activity to stabilise the alloying element nitrides MeN in Fe–Me–N alloys is calculated. A strategy is offered to stabilise the alloying element nitrides and to determine the nitrogen content strongly bonded in the nitrides. |
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| Keywords: | Nanonitride composition Nanonitride stability Nitriding Denitriding Hydrogen reduction |
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