Wear Resistance of Fine-Grained High Nitrogen Austenitic Stainless Steel Coated with Amorphous Carbon Films: The Soft X-ray Spectroscopy Approach |
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Authors: | Valentini L Di Schino A Kenny JM La Rosa S Lozzi L Santucci S Bregliozzi G Gerbig Y Haefke H |
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Affiliation: | 1. Materials Engineering Center, University of Perugia, 05100, TERNI, Italy 2. Sincrotrone Trieste SCpA, S.S.14-Km163.5, 34012, Basovizza—Trieste, Italy 3. Dipartimento di Fisica—Unità INFM, Università dell'Aquila, 67010, Coppito (AQ), Italy 4. CSEM, Rue Jaquet Droz 1, CH-2007, Neuchatel, Switzerland
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Abstract: | The wear resistance dependence on grain size of a high-nitrogen-alloyed austenitic stainless steels (HN) is investigated and compared to measurements for the same samples coated with amorphous carbon (a-C:H) and nitrogenated amorphous carbon (a-C:H(N)) films, deposited by means of plasma-enhanced chemical vapour deposition. A synergic effect between the grain refining and the film in the case of nitride amorphous carbon overcoats is observed in terms of increased low-friction performance duration. The temperature dependence of the wear resistance of a micro crystalline HN stainless steel coated with carbon films is also investigated. An overall decrease of the films' wear resistance is found with increasing temperature. Furthermore, a higher wear resistance is found in the a-C:H coated steel with respect to the a-C:H:N material. High-lateral-resolution photoemission microscopy reveals that inhomogeneities within the film after wear testing are correlated to an increase of the number of N-sp2 C-bonded sites. The study of energy-distribution curves and high-lateral-resolution images on the nitrogenated samples shows that a modification of the surface chemistry occurs by mechanical action; in particular this implies that existing N-sp2 C sites are beginning to cluster as temperature increases. |
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