Friction in near-surface regions of plasma-nitrided and post-oxidized plain steel at various hydrogen contents |
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Authors: | C LuvisonV Sonda AC RovaniF Cemin FG EcheverrigarayC Aguzzoli AE CrespiCLG Amorim MEH Maia da CostaIJR Baumvol CA Figueroa |
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Affiliation: | a Centro de Ciências Exatas e Tecnologia, Universidade de Caxias do Sul, 95070-560 Caxias do Sul, RS, Brazil b Departamento de Física, Pontifícia Universidade Católica do Rio do Janeiro, 22453-900 Rio de Janeiro, RJ, Brazil c Instituto de Física, Universidade Federal do Rio Grande do Sul, 91509-970 Porto Alegre, RS, Brazil d Plasmar Tecnologia Ltda., 95070-560 Caxias do Sul, RS, Brazil |
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Abstract: | We investigated the low load friction behavior of plasma post-oxidized, plasma- nitrided AISI 1045 plain steel, using unidirectional sliding tests. The hydrogen content in the post-oxidation plasma was varied between 0 and 25%. The nitrided or oxidized layer thicknesses ranged from approximately 340-380 μm or 0.7-1.1 μm, respectively. The outermost iron oxide layer decreases the friction, whereas the underneath iron nitride layer increases the mechanical strength. The incorporation of hydrogen in the oxidative plasma mixture allows to control the type of iron oxide phase. It is observed that the presence of a superficial magnetite layer leads to a decrease of the friction coefficient with respect to the non-oxidized nitrided steel. The results are interpreted on the lights of crystal chemistry and with a model to explain the in-depth effects of hydrogen in the oxidative plasma. |
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Keywords: | Plasma oxidation Plasma nitriding Hydrogen Surface properties Magnetite |
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