Ultra-high surface hardness in nitrogen ion implanted low alloy steel

Ayodele Olofinjana; Z Chen; J M Bell

doi:10.1016/S0167-577X(01)00512-2

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Ultra-high surface hardness in nitrogen ion implanted low alloy steel

Journal article

Peer reviewed

Ultra-high surface hardness in nitrogen ion implanted low alloy steel

Ayodele Olofinjana, Z Chen and J M Bell

Materials Letters, Vol.53(6), pp.385-391

2002

DOI: https://doi.org/10.1016/S0167-577X(01)00512-2

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Abstract

Engineering

Chemical Sciences

The surface composition of low alloy steel after N2 + implantation was studied with X-ray photoelectron spectroscopy (XPS). The effect of the implantation on the mechanical hardness was evaluated by ultra-micro-hardness indentation. Chemical characterisation of the surface indicated that a thin layer rich in N, C and Si was formed. It is shown that Fe played little role in the chemical composition and the structure of the modified surface. The mechanical hardness of N2 + implanted surface was 35 to 50 GPa compared with a value of 10 GPa for untreated sample. It is thought that the ultra-high hardness observed on the surface and in the sub-surface was a result of chemical modification to form a modified layer of Si-doped carbon nitride. Evidences from the XPS and the nanoindentation suggest that the nature of the C-N bonds in the near surface are most likely to be sp3 types in a similar configuration expected in crystalline β C3N4.

Details

Title: Ultra-high surface hardness in nitrogen ion implanted low alloy steel
Authors: Ayodele Olofinjana (Author) - University of Waikato, New Zealand
Z Chen (Author) - Queensland University of Technology
J M Bell (Author) - Queensland University of Technology
Publication details: Materials Letters, Vol.53(6), pp.385-391
Publisher: Elsevier BV
Date published: 2002
DOI: 10.1016/S0167-577X(01)00512-2
ISSN: 0167-577X
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99448806602621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Physics, Applied