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    Friction and wear of lubricated M3 class 2 sintered high speed steel with and without TiC and MnS additives.

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    Publication date
    2004
    Author
    Mitchell, Stephen C.
    Watts, Andrew
    Wronski, Andrew S.
    Zalisz, Z.
    Keyword
    Additives
    Boundary film
    Wear
    Cast irons
    High speed steels
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    M3/2 sintered high speed steel and composite materials processed by initial admixing of 5 wt.% TiC (to decrease wear) and 5 wt.% MnS (to minimise friction) powders, singly and in combination, were assessed in pin-on-disc tribometers specially constructed to simulate use in the automotive valve train. Pins were of the sintered materials and the mating tribological material discs of T1 high speed steel. For comparison with existing conventional materials, identical tests were performed with discs and pins of two types of spheroidal cast iron. Testing at 110 °C, employing a few drops of fresh Shell Helix Standard SAE: 15W-40, API: SJ/CF oil, in daily segments of 5000 m of sliding distance was carried out until the break of the boundary film and appearance of the early signs of seizure. Accordingly the conditions were initially elastohydrodynamic, then mixed lubrication, then boundary, and finally decaying boundary. In comparison with the baseline cast iron system, the friction, wear and lifetime performance of all the high speed steel systems was markedly superior. MnS further lowered the coefficient of friction and TiC increased the load carrying capacity of M3/2 steel. The lifetime, test distance until seizure, was the most discriminating parameter between the high speed steel systems, being 1.5¿3 times longer for the unmodified M3/2 than the composites and 10 times longer than that of the cast irons system.
    URI
    http://hdl.handle.net/10454/3067
    Version
    No full-text available in the repository
    Citation
    Mitchell, S.C., Watts, A., Wronski, A. and Zalisz, Z. (2004). Friction and wear of lubricated M3 class 2 sintered high speed steel with and without TiC and MnS additives. Wear. Vol. 258, No. 5-6, pp. 701-711.
    Link to publisher’s version
    https://doi.org/10.1016/j.wear.2004.09.069
    Type
    Article
    Collections
    Engineering and Informatics Publications

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