1. Influence of oxidizing and Nitriding parameters on nitrogen concentration of electrical steels
- Author
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M. Teodorescu, Laurent Barrallier, Fabrice Guittonneau, Sébastien Jegou, Mechanics surfaces and materials processing (MSMP), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), ThyssenKrupp Electrical Steel, and collaboration thyssenkrupp Electrical Steel
- Subjects
Materials science ,Matériaux [Sciences de l'ingénieur] ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,Nitride ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,chemistry.chemical_compound ,Ferrite (iron) ,0103 physical sciences ,Oxidizing agent ,General Materials Science ,phase transformations ,Texture (crystalline) ,Electrical Steel ,010302 applied physics ,Austenite ,GDOES ,020502 materials ,Mechanical Engineering ,Metallurgy ,Condensed Matter Physics ,Nitrogen ,thermochemical surface treatments ,0205 materials engineering ,chemistry ,Mechanics of Materials ,Oxidizing ,solid diffusion ,Nitriding - Abstract
The influence of oxidizing and nitriding parameters on the nitrogen concentration of grain-oriented electrical steels preliminary to the development of the final Goss texture was explored. Results show that the nitrogen enrichment is driven by a ferrite to austenite transformation during thermochemical treatments. Such a trans- formation is promoted by (i) a redistribution of ferrite-forming elements close to the surface during oxidizing prior to nitriding, (ii) the oxygen content within the oxide layer prior to nitriding, (iii) the temperature of oxidizing and nitriding, and (iv) the nitrogen enrichment during nitriding. Optimization of the nitrogen content, and thus the precipitation kinetics of alloying elements nitrides (e.g. inhibitors) required for the development of the final Goss texture can be controlled by an optimization of the oxide layer growth, the temperatures and gas mixture of nitriding. collaboration thyssenkrupp Electrical Steel
- Published
- 2021
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