Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231764

Title

Cross-sectional transmission electron microscopy characterisation of plasma immersion ion implanted austenitic stainless steel

Author(s)

Li, X.;  Samandi, M.;  Dunne, D.;  Collins, G.;  Tendys, J.;  Short, K.;  Hutchings, R.

Abstract

Cross-sectional transmission electron microscopy (XTEM), selected area diffraction (SAD) and nano-beam diffraction (NBD) techniques were used to investigate the surface microstructure of 316 stainless steel, implanted with high doses of nitrogen ions at 150, 250, 350, 450 and 520 degrees Celsius using plasma immersion ion implantation, It has been found that the treatment temperature has a strong influence on the evolution of the microstructure. An amorphous layer of about 1 μm thick with a heavily stressed substrate underneath was observed on the 150 degrees Celsius implanted sample. Both the 250 and 350 degrees Celsius implanted samples showed a thin nanocrystalline sublayer at the outermost surface and an amorphous sublayer between the nanocrystalline sublayer and the substrate. A thick amorphous layer up to 3 μm thick was formed on the 450 degrees Celsius implanted sample whereas at 520 degrees Celsius, cellular precipitation of CrN and α-ferrite dominated the system. It is suggested that a solid state chemical reaction and the poor mobility of the reactant atoms are the key factors for the solid state amorphisation by nitrogen ion implantation into austenite.

Publication type

Journal article

Source

Surface and Coatings Technology: incorporating the proceedings of the 1996 International Workshop on Plasma-Based Ion Implantation, Sydney, New South Wales, Australia, 12-15 February 1995 / B. D. Sartwell and A. Matthews (eds.), Vol. 85, no. 1-2 (Nov 1996), pp. 28-36

Publication year

1996

FOR Code(s)

0204 Condensed Matter Physics;  0306 Physical Chemistry (Incl. Structural);  0912 Materials Engineering

Keyword(s)

Amorphisation;  Amorphous materials;  Cellular precipitation;  Characterisation;  Chemical reactions;  Ion implantation;  Microstructure;  Nanobeam diffraction;  Plasma applications;  Plasma immersion ion implantation;  Chemical precipitation;  Selected area diffraction;  Stainless steel;  Steel metallography;  Surface microstructure;  Surface structure;  Surface treatment;  Transmission electron microscopy;  XTEM

Publisher

Elsevier

ISSN

0257-8972

Publisher URL

http://dx.doi.org/10.1016/0257-8972(96)02879-4

Copyright

Copyright © 1996 Elsevier B.V. All rights reserved.

Peer reviewed