Navegando por Autor "Rossino, Luciana Sgarbi"
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Artigo Enhancing wear resistance of AISI 1045 steel through duplex plasma treatment with vanadium cage(JOM, 2025-02) Silva, Lucas Pereira da; Libório, Maxwell Santana; Sousa, Ediones Maciel de; Silva, Lauriene Gonçalves da Luz; Monção, Renan Matos; Brito, Marcos Cristino de Sousa; Costa, Thércio Henrique de Carvalho; Almeida, Larissa Solano de; Rossino, Luciana Sgarbi; Sousa, Rômulo Ribeiro Magalhães de; https://orcid.org/0000-0001-7429-4273; https://orcid.org/0000-0003-1579-8775; https://orcid.org/0000-0002-5595-2207; https://orcid.org/0000-0001-5174-1077; https://orcid.org/0000-0001-9097-9950; https://orcid.org/0000-0003-4893-9976; https://orcid.org/0000-0002-0524-5117; https://orcid.org/0000-0001-6858-1524; https://orcid.org/0000-0003-2755-8349; https://orcid.org/0000-0003-2062-6505AISI 1045 steel is widely used in mechanical parts of industrial equipment. However, its surface mechanical properties can be improved to increase this steel's applicability and service life. This study proposes an evaluation of the feasibility of duplex treatment concerning plasma nitriding (PN) and cathodic cage plasma deposition (CCPD) for reducing wear on AISI 1045 steel. X-ray diffraction, roughness, Vickers hardness, scanning electron microscopy, and wear test results showed that duplex treatment (PN + CCPD) caused the formation of nitride phases responsible for surface hardening, a significant increase in wear resistance for samples subjected to PN and duplex treatment. However, the sample subjected to duplex treatment showed a hardness 77.2% higher than that of the sample that was only nitrided and a greater depth of surface modification, giving the duplex treatment mechanical advantages due to the longer period of time required for AISI 1045 mechanical partsArtigo Optimizing surface properties of AISI 409 stainless steel through duplex treatment consisting of plasma nitriding and vanadium-based deposition(ACS Omega, 2025-07-16) Silva, André Felipe Soares do Monte e; Almeida, Larissa Solano de; Silva, Leandro Almeida; Rossino, Luciana Sgarbi; Nunes, Maelson Sousa; Libório, Maxwell Santana; Costa, Thércio Henrique de Carvalho; Bandeira, Rafael Marinho; Sousa, Rômulo Ribeiro Magalhães de; https://orcid.org/0000-0001-7429-4273; https://orcid.org/0000-0001-6858-1524; https://orcid.org/0000-0003-2755-8349; https://orcid.org/0000-0002-0060-8943; https://orcid.org/0000-0003-1579-8775; https://orcid.org/0000-0002-4362-7466; https://orcid.org/0000-0003-2062-6505This study proposes a surface modification methodology for AISI 409 stainless steel by combining cathodic cage plasma nitriding (CCPN) and deposition (CCPD), evaluating the benefits of this duplex treatment over individual treatments. The mechanical strength, tribological behavior, and corrosion resistance of the treated surfaces were investigated in relation to processing parameters and resulting microstructures. Analyses were performed using XRD, SEM, Vickers microhardness, ball-on-disc testing, and corrosion testing in a 3.5% NaCl solution. The duplex treatment at 400 and 450 °C, consisting of CCPN followed by CCPD, promoted significant surface modifications. Nitriding resulted in a thick layer of Fe3N, Fe4N, and CrN, increasing hardness and wear resistance, with final improvements of 5.7 and 33.5 times, respectively. The subsequent VN deposition enhanced corrosion resistance, shifting the potential from −396 mV to −221 mV, indicating reduced electrochemical activity. These results confirm the treatment’s potential for automotive exhaust systems, requiring lightweight, durable materials in aggressive environments