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Ferritic nitrocarburising of tool steels

King, P. C., Reynoldson, R. W., Brownrigg, Allan and Long, John 2005, Ferritic nitrocarburising of tool steels, Surface engineering, vol. 21, no. 2, pp. 86-98.

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Title Ferritic nitrocarburising of tool steels
Author(s) King, P. C.
Reynoldson, R. W.
Brownrigg, Allan
Long, John
Journal name Surface engineering
Volume number 21
Issue number 2
Start page 86
End page 98
Publisher Maney Publishing
Place of publication London, England
Publication date 2005-04
ISSN 0267-0844
Keyword(s) nitrocarburising
tool steel: H13, M2, D2, P20
reactive diffusion
GD-OES
cover layer
compound layer
diffusion zone
porosity
fluidised
Summary Four different tool steel materials, P20, H13, M2 and D2, were nitrocarburised at 570°C in a fluidised bed furnace. The reactive diffusion of nitrogen and carbon into the various substrate microstructures is compared and related to the different alloy carbide distributions. The effect of carbon bearing gas (carbon dioxide, natural gas) on carbon absorption is reported, as well as its influence on compound layer growth and porosity. Partial reduction of Fe3O4 at the surface resulted in the formation of a complex, epsi-nitride containing oxide layer. In H13, carbon was deeply absorbed throughout the entire diffusion zone, affecting the growth of grain boundary cementite, nitrogen diffusivity and the sharpness of the compound layer: diffusion zone interface. When natural gas was used, carbon became highly concentrated in the compound layer, while surface decarburisation occurred with carbon dioxide. These microstructural effects are discussed in relation to hardness profiles, and compound layer hardness and ductility. The surfaces were characterised using glow discharge optical emission spectroscopy, optical and scanning electron microscopy and X-ray diffraction.
Language eng
Field of Research 091505 Heat and Mass Transfer Operations
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, Institute of Materials, Minerals and Mining
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003089

Document type: Journal Article
Collections: School of Engineering and Technology
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