Tribological properties of plasma nitrided and hard coated AISI 4140 steel

B. Podgornik (Corresponding Author), J. Vizintin, O. Wänstrand, M. Larsson, S. Hogmark, Helena Ronkainen, Kenneth Holmberg

    Research output: Contribution to journalArticleScientificpeer-review

    106 Citations (Scopus)


    In the present study, samples made of AISI 4140 steel pre-treated with plasma nitriding and coated with different PVD coatings (TiN, TiAlN and ta-C) were investigated in terms of their microhardness, surface roughness, scratch adhesion and dry sliding wear resistance. Wear tests, in which duplex-treated pins were mated to hardened ball bearing steel discs, were performed with a pin-on-disc machine. To examine the influence of the nitrided zone on the performance of the coating–substrate composite, coatings were deposited on hardened as well as on plasma nitrided samples, prepared under different nitriding conditions.

    The results of the investigation showed improved mechanical and wear properties of the plasma nitrided hard-coated specimens compared to the uncoated and pre-hardened ones. Furthermore, the compound layer was found to act as an intermediate hard layer leading to superior sliding wear properties of the composite.
    Original languageEnglish
    Pages (from-to)254-259
    Number of pages6
    Issue number3-4
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed
    Event9th Nordic Symposium on Tribology: NORDTRIB 2000 - Porvoo, Finland
    Duration: 11 Jun 200014 Jun 2000


    • plasma nitriding
    • hard coatings
    • Duplex treatment
    • Dry sliding


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