Chemical modification and the attending surface hardness of low alloy steel through medium energy nitrogen ion implantation

Ayodele Olofinjana; T Tesfamichael; J M Bell

doi:10.1016/j.jmatprotec.2005.02.054

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Chemical modification and the attending surface hardness of low alloy steel through medium energy nitrogen ion implantation

Journal article

Peer reviewed

Chemical modification and the attending surface hardness of low alloy steel through medium energy nitrogen ion implantation

Ayodele Olofinjana, T Tesfamichael and J M Bell

Journal of Materials Processing Technology, Vol.164-165, pp.905-910

2005

DOI: https://doi.org/10.1016/j.jmatprotec.2005.02.054

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Abstract

Mechanical Engineering

Materials Engineering

Manufacturing Engineering

ion implantation

low alloy steel

surface modification

ultra high hardness

silicon carbo-nitride

A surface hardenable low alloy carbon steel was implanted with medium energy (20-50 KeV) N2 + ions to produce a modified hardened surface. The implantation conditions were varied and are given in several doses. The surface hardness of the treated and untreated steels was studied using depth sensing ultra microindentation system (UMIS). It is shown that the hardness of nitrogen ion implanted steel samples varied from 35 to 50 GPa depending on the implantation conditions and the doses of the N2 + implantation. These hardness values were higher than those previously published for ion implanted tool steels. The surfaces of the treated samples were examined by X-ray photoelectron spectroscopy (XPS). It was found that the high hardness on the implanted surfaces was as a result of formation of non-equilibrium nitrides. High-resolution XPS studies indicated that the nitride formers were essentially C and Si on the surface of the steel. These results suggest that the ion implantation provided the conditions for a preferential formation of C and Si nitrides. The combination of evidences from nano-indentation and XPS, points towards possible formation of silicon carbo-nitride in a suspected (C,Si)xNy stoichiometry. This finding is consistent with recent reports for the preparation of ultra hard silicon carbo-nitride. The present results sets up case for investigating and exploring silico-carbo-nitrided surfaces in order to develop improved wear resistance low alloy steels for use in high contact applications.

Details

Title: Chemical modification and the attending surface hardness of low alloy steel through medium energy nitrogen ion implantation
Authors: Ayodele Olofinjana (Author) - Universiti Brunei Darussalam, Brunei
T Tesfamichael (Author) - Queensland University of Technology
J M Bell (Author) - Queensland University of Technology
Publication details: Journal of Materials Processing Technology, Vol.164-165, pp.905-910
Publisher: Elsevier S.A.
Date published: 2005
DOI: 10.1016/j.jmatprotec.2005.02.054
ISSN: 0924-0136
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99448994902621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Engineering, Industrial; Engineering, Manufacturing; Materials Science, Multidisciplinary