Nitriding Iron at Lower Temperatures

The microstructure in the surface layer of a pure iron plate was refined at the nanometer scale by means of a surface mechanical attrition treatment that generates repetitive severe plastic deformation of the surface layer. The subsequent nitriding kinetics of the treated iron with the nanostructure...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2003-01, Vol.299 (5607), p.686-688
Main Authors: Tong, W. P., Tao, N. R., Wang, Z. B., Lu, J., Lu, K.
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Climate
Diffusion coefficient
Exact sciences and technology
Grain boundaries
Iron
Iron (Metal)
Kinetics
Materials
Metallic coatings
Metallurgical research
Metals. Metallurgy
Metalworking
Nanocrystals
Nitrides
Nitriding
Nitrogen
Plasticity
Production techniques
Surface layers
Surface Structure
Surface temperature
Surface treatment
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Summary:The microstructure in the surface layer of a pure iron plate was refined at the nanometer scale by means of a surface mechanical attrition treatment that generates repetitive severe plastic deformation of the surface layer. The subsequent nitriding kinetics of the treated iron with the nanostructured surface layer were greatly enhanced, so that the nitriding temperature could be as low as 300°C, which is much lower than conventional nitriding temperatures (above 500°C). This enhanced processing method demonstrates the technological significance of nanomaterials in improving traditional processing techniques and provides a new approach for selective surface reactions in solids.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1080216