The evolution of subsurface deformation and tribological degradation of a multiphase Fe-based hardfacing induced by sliding contact

M. J. Carrington (Corresponding Author), J. L. Daure, S. Utada, V. L. Ratia-Hanby, P. H. Shipway, D. A. Stewart, D. G. McCartney

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    Multiphase Fe-based hardfacing alloys, for example Tristelle 5183 Fe-21%Cr-10%Ni-7.5%Nb-5%Si-2%C in wt.%, are extensively used for tribological applications, including valves, bearings and drive mechanisms, where two surfaces are unavoidably subjected to loaded sliding contact within engineering systems. In this study, transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD) were used to characterise, for the first time, the tribologically affected material induced by the self-mated sliding contact of HIPed Tristelle 5183. This provided novel insight into the deformation modes which permit the accumulation of the high levels of subsurface strain required for plasticity dominated (adhesive) wear in a commercial hardfacing. In the subsurface regions furthest from the sliding contact, plastic deformation is accommodated by deformation induced martensitic transformation to ϵ-martensite and α′-martensite, twinning, the generation of planar dislocation arrangements (generated by planar slip) and the generation of dislocation tangles. Closer to the sliding contact, the subsurface becomes unstable, and nanocrystallisation driven by grain boundary mediated deformation mechanisms and crystallographic slip completely engulf the near surface microstructure. It is postulated that nanocrystalisation within the subsurface is a needed in order to accommodate the extremely high strains required in order to permit tribological degradation via plasticity dominated wear. The extrusion of metallic slivers via plastic ratcheting generates ductile shear cracks governed by plastic strain, and the failure of these slivers generates plate/flake-like wear debris.

    Original languageEnglish
    Article number146023
    Number of pages18
    JournalMaterials Science and Engineering A
    Volume892
    DOIs
    Publication statusPublished - Feb 2024
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Deformation structures
    • Hardfacings
    • Nanocrystalline microstructure
    • Severe plastic deformation
    • Transmission electron microscopy (TEM)
    • Tribology

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