Effect of short-term low-temperature austempering on the microstructure and abrasive wear of medium-carbon low-alloy steel

LUO, Quanshun, MEI, Haijuan, KITCHEN, Matthew, GAO, Yubi and BOWEN, Leon (2020). Effect of short-term low-temperature austempering on the microstructure and abrasive wear of medium-carbon low-alloy steel. Metals and Materials International.

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    Abstract

    Nano-bainitic steels have attracted great attention for good wear resistance. In this research, a medium-carbon low-alloyed steel was austempered at a low temperature close to its martensite-start temperature for various times to obtain mixed microstructure of nano-bainite, martensite and retained austenite. The austempered samples were characterised comprehensively by field-emission SEM and quantitative XRD. Its two-body abrasive wear property was evaluated by sliding on a SiC abrasive disc. The results revealed the formation of initial nano-width carbide-free bainitic ferrite (BF) after austempering by 10 minutes, whereas the BF size and amount both increased with the austempering time. The austempered samples exhibited wear coefficients lower than the quenched martensitic sample by up to 50%. SEM and TEM observations showed wear mechanisms of micro-cutting and ploughing deformation, including the formation of a nano-laminate top layer and bending deformation in the subsurface multiphase microstructure. The decreased wear loss was attributed to the role of retained austenite in the increased plasticity.

    Item Type: Article
    Uncontrolled Keywords: Materials; 0912 Materials Engineering
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 18 Dec 2020 12:44
    Last Modified: 17 Mar 2021 17:46
    URI: http://shura.shu.ac.uk/id/eprint/27846

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