Effect of nature of nitride phases on sliding wear of plasma nitrided sintered iron

Effect of nature of nitride phases on sliding wear of plasma nitrided sintered iron In the present investigation, the effect of the nature of the iron nitrides (γ′-Fe4N or ε-Fe2-3N) on the sliding wear of plasma nitrided unalloyed sintered iron is studied. Plasma nitriding was performed in an industrial scale plasma reactor using two different sets of operative parameters to produce microstructures composed of different dominant iron nitride phases, i.e., γ′-Fe4N and ε-Fe2–3N. Microstructural characterisation was performed using optical microscopy, phase analysis was performed via X-ray diffraction, and topographical analysis was performed using laser interferometry. Dry, ball-on-flat and reciprocating sliding tests were used to perform the tribological characterisation. The wear loss was determined by volumetric loss of the wear scar using laser interferometry. The wear rate of the counter-body was also evaluated. Wear mechanisms were characterised using scanning electron microscopy. Compact, free of porosity compound layers with the same thickness were formed, all of which were topographically similar. The analysis of the worn surfaces showed that several wear mechanisms operate simultaneously during the wear process, with the most significant mechanisms being oxidative and abrasive wear. Based on the wear mechanisms, a model for the wear of the nitrided layers (composite layer and diffusion layer) was proposed. The tribological tests indicate that, for the tribo-system evaluated, the ε-nitride layer exhibited a superior wear performance. The volume loss for the ε-phase was two times lower than that for the γ′-phase. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wear Elsevier

Effect of nature of nitride phases on sliding wear of plasma nitrided sintered iron

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier B.V.
ISSN
0043-1648
eISSN
1873-2577
D.O.I.
10.1016/j.wear.2015.01.083
Publisher site
See Article on Publisher Site

Abstract

In the present investigation, the effect of the nature of the iron nitrides (γ′-Fe4N or ε-Fe2-3N) on the sliding wear of plasma nitrided unalloyed sintered iron is studied. Plasma nitriding was performed in an industrial scale plasma reactor using two different sets of operative parameters to produce microstructures composed of different dominant iron nitride phases, i.e., γ′-Fe4N and ε-Fe2–3N. Microstructural characterisation was performed using optical microscopy, phase analysis was performed via X-ray diffraction, and topographical analysis was performed using laser interferometry. Dry, ball-on-flat and reciprocating sliding tests were used to perform the tribological characterisation. The wear loss was determined by volumetric loss of the wear scar using laser interferometry. The wear rate of the counter-body was also evaluated. Wear mechanisms were characterised using scanning electron microscopy. Compact, free of porosity compound layers with the same thickness were formed, all of which were topographically similar. The analysis of the worn surfaces showed that several wear mechanisms operate simultaneously during the wear process, with the most significant mechanisms being oxidative and abrasive wear. Based on the wear mechanisms, a model for the wear of the nitrided layers (composite layer and diffusion layer) was proposed. The tribological tests indicate that, for the tribo-system evaluated, the ε-nitride layer exhibited a superior wear performance. The volume loss for the ε-phase was two times lower than that for the γ′-phase.

Journal

WearElsevier

Published: May 1, 2015

References

  • Surface durability of steam treated sintered iron alloys
    Molinari, A.; Straffelini, G.
  • Effect of processing parameters on the surface durability of steam-oxidized sintered iron
    de Mello, J.D.B.; Hutchings, I.M.
  • Glow Discharge Processes Sputtering and Plasma Etching
    Chapman, B.N.
  • Dry sliding of plasma-sintered iron – the influence of nitriding on wear resistance
    Pavanati, H.C.; Strafellini, G.; Maliska, A.M.; Klein, A.N.
  • Study of ion-nitriding
    Hudis, M.
  • Fretting wear of sintered iron under low normal pressure
    Leheup, E.R.; Zhang, D.; Moon, J.R.
  • The significance and use of the friction coefficient
    Blau, P.
  • Influence of residual stress on fracture and delamination of thin hard coatings
    Wiklund, U.; Gunnars, S.; Hogmark, S.

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