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      Improvement of mechanical properties and corrosion resistance of 316L and 304 stainless steel by low temperature plasma cementation

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          Abstract

          ABSTRACT Low temperature plasma carburizing treatment of austenitic stainless steels is a carbon surface diffusion process for a surface hardness and corrosion and wear resistance. The process is carried out by introducing a mixture of carbon-containing gases and through the use of low temperatures the resulting cemented layer usually contains a single phase of supersaturated austenite with carbon – S-phase. For the present investigation, austenitic stainless steels AISI 316L and 304 were plasma cemented for 8 hours in the gas mixture containing 7.5% CH4 in H2, with a pressure of 500 Pa, at temperatures of 375 ºC and 450 ºC. The phases formed were determined by X-ray diffraction. The corrosion resistance was evaluated through immersion tests over time and cyclic voltammetry. The results indicate that there was no formation of compounds (carbides) in the cemented layer for both steels at any of the temperatures and there was a corrosion resistance improvement.

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          Wear and Corrosion Study of Plasma Nitriding F53 Super duplex Stainless Steel

          Super duplex stainless steels (SDSS) have high corrosion resistance because of their high contents of chromium, nickel, molybdenum and nitrogen but low wear resistance. To improve the wear resistance of these steels without affecting their corrosion resistance, samples of SDSS were treated by plasma ion nitriding at temperatures ranging from 350 °C to 570 °C for two hours. This thermochemical treatment resulted in the formation of different types of nitrides that affected the microhardness, the microwear behaviour and the corrosion resistance of the metal surface. The microwear resistance decreased at 400 °C because different nitrides formed on the surface, thereby increasing the hardness and volume wear resistance of the steel. The test results showed that the alloys that were nitrided at 400 °C and 450 °C exhibited the highest corrosion resistance to a solution medium containing chloride ions.
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            Chromium depletion in the vicinity of carbides in sensitized austenitic stainless steels

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              Low temperature plasma nitrocarburising of AISI 316 austenitic stainless steel

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                Author and article information

                Journal
                rmat
                Matéria (Rio de Janeiro)
                Matéria (Rio J.)
                Rede Latino-Americana de Materiais (Rio de Janeiro, RJ, Brazil )
                1517-7076
                2020
                : 25
                : 2
                : e-12636
                Affiliations
                [01] Brasilia DF orgnameUniversity of Brasilia orgdiv1Faculty of Technology Brazil silviogobbi2@ 123456gmail.com
                Article
                S1517-70762020000200329 S1517-7076(20)02500200329
                10.1590/s1517-707620200002.1036
                6b95e1b0-2b65-4289-864b-650d764dac7d

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 16 October 2019
                : 16 April 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 26, Pages: 0
                Product

                SciELO Brazil

                Categories
                Articles

                corrosion,AISI 316L,plasma carburizing,AISI 304
                corrosion, AISI 316L, plasma carburizing, AISI 304

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