Cr(N,C) diffusion coating formation on pre-nitrocarburised H13 tool steel

King, P. C., Reynoldson, R. W., Brownrigg, Allan and Long, John 2004, Cr(N,C) diffusion coating formation on pre-nitrocarburised H13 tool steel, Surface and coatings technology, vol. 179, no. 1, pp. 18-26.

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Title Cr(N,C) diffusion coating formation on pre-nitrocarburised H13 tool steel
Author(s) King, P. C.
Reynoldson, R. W.
Brownrigg, Allan
Long, John
Journal name Surface and coatings technology
Volume number 179
Issue number 1
Start page 18
End page 26
Publisher Elsevier Science SA
Place of publication Amsterdam, Netherlands
Publication date 2004-02-02
ISSN 0257-8972
Keyword(s) thermoreactive deposition and diffusion
nitrocarburising
fluidised bed
chromium carbonitride
glow discharge optical emission spectroscopy
Summary The microstructural processes of Cr(N,C) coating formation by thermoreactive deposition and diffusion (TRD) on pre-nitrocarburised H13 tool steel were studied. Both nitrocarburising and TRD were performed in fluidized bed furnaces at 570 °C. During TRD, chromium was transferred from chromium powder in the fluidized bed, to the nitrocarburised substrates by gas-phase reactions initiated by reaction of HCl gas with the chromium. Addition of 30% H2 to the input inert gas was found to increase the rate of coating formation, although hydrogen reduction resulted in rapid loss of nitrogen to the surface. The reason for the increased rate of coating formation could not be established without further investigation, although several possible explanations have been proposed. It was found that porosity and the formation of an iron nitride ‘cover layer’ during nitrocarburising were the biggest influences on the microstructure of the Cr(N,C) coating. Microstructural characterization of the coatings was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and glow discharge optical emission spectroscopy (GDOES).
Language eng
Field of Research 091499 Resources Engineering and Extractive Metallurgy not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002635

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