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Why Does Nitriding of Grain-Oriented Silicon Steel Become Slower at Higher Temperature?

Lookup NU author(s): Dr Peng Gong

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Abstract

The nitriding process plays an essential role in the production of grain-oriented silicon steel (GOSS) via the acquired-inhibitor process. It is surprising at first glance to find that the increase of temperature from 840 to 930 °C retards the nitriding of GOSS rather than accelerating it. By both extensive microstructural characterization and thermodynamic calculations, this is attributed to the formation of austenite at high temperature in the oxidization layer, in which N atoms diffuse at a much lower rate than in ferrite. It is concluded that there exists an upper-limit temperature for the efficient nitriding of GOSS, which is determined by both the preceding decarburization process and the nitriding atmosphere.

Publication metadata

Author(s): Guo QY, Li XH, Gong P, Nutter J, Rainforth WM, Luo HW

Publication type: Article

Publication status: Published

Journal: Steel Research International

Year: 2021

Volume: 92

Issue: 4

Print publication date: 01/04/2021

Online publication date: 05/01/2021

Acceptance date: 28/12/2020

ISSN (print): 1611-3683

ISSN (electronic): 1869-344X

Publisher: Wiley-VCH Verlag GmbH & Co. KGaA

URL: https://doi.org/10.1002/srin.202000545

DOI: 10.1002/srin.202000545

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