Navegando por Autor "Monção, Renan Matos"
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Artigo Corrosion resistance of SAE 5160 steel deposited by duplex simultaneous treatment with hastelloy cathodic cage(Lubricants, 2025-04-12) Costa, Thércio Hentique de Carvalho; Brito, Marcos Cristino de Sousa; Pereira, Juliermes Carvalho; Silva, Lauriene Gonçalves da Luz; Monção, Renan Matos; Sousa, Ediones Maciel de; Sampaio, Weslley Rick Viana; Nascimento, Igor Oliveira; Araújo, Anthunes Íkaro de; Feitor, Michelle Cequeira; Sousa, Rômulo Ribeiro Magalhães de; https://orcid.org/0000-0001-7429-4273; https://orcid.org/0000-0002-0524-5117; https://orcid.org/0009-0006-1406-6184; https://orcid.org/0000-0003-4893-9976; https://orcid.org/0000-0002-0721-6766; https://orcid.org/0000-0003-2062-6505; https://orcid.org/0000-0003-3268-0197; https://orcid.org/0000-0001-5174-1077; https://orcid.org/0000-0003-0458-2557; https://orcid.org/0000-0002-4850-9493SAE 5160 steel, classified as high-strength, low-alloy steel, is widely used in the automotive sector due to its excellent mechanical strength and ductility. However, its inherently low corrosion resistance limits its broader application. This study explores the application of the cathodic cage plasma deposition (CCPD) technique to enhance the corrosion resistance of SAE 5160 steel. The treatment was performed using a Hastelloy cathodic cage under two atmospheric conditions: hydrogen-rich (75%H2/25%N2) and nitrogen-rich (25%H2/75%N2). Comprehensive analyses revealed significant improvements in surface properties and corrosion resistance. The hydrogen-rich condition (H25N) facilitated the formation of Cr0.4Ni0.6 and CrN phases, associated with a nanocrystalline structure (37.6 nm) and a thicker coating (45.5 μm), resulting in polarization resistance over 290 times greater than that of untreated steel. Conversely, nitrogen-rich treatment (H75N) promoted the formation of Fe3N and Fe4N phases, achieving a dense but thinner layer (19.6 μm) with polarization resistance approximately 20 times higher than that of untreated steel. These findings underscore the effectiveness of CCPD as a versatile and scalable surface engineering technique capable of tailoring the properties of SAE 5160 steel for use in highly corrosive environments. This study highlights the critical role of optimizing gas compositions and treatment parameters, offering a foundation for advancing plasma-assisted technologies and alloying strategies. The results provide a valuable framework for developing next-generation corrosion-resistant materials, promoting the longevity and reliability of high-strength steels in demanding industrial applicationsArtigo 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 parts