13 documents found, page 1 of 2
An assessment of biomedical CoCrMo alloy fabricated by direct metal laser sinte...
Girão, Daniel de Castro; Béreš, Miloslav; Jardini, André Luiz; Maciel Filho, Rubens; Silva, Cleiton Carvalho; Siervo, Abner deCoCrMo alloys have been used for several decades in implantable devices due to their favourable mechanical properties, low wear rate in addition to good biocompatibility and high corrosion resistance. These alloys are conventionally produced via casting and/or forging route, however additive manufacturing techniques being recently employed in their fabrication. In this work, CoCrMo samples were produced by dire...
Determination of the sensitized zone extension in welded AISI 304 stainless ste...
Lima Neto, Pedro de; Farias, Jesualdo Pereira; Herculano, Luís Flávio Gaspar; Miranda, Hélio Cordeiro de; Araújo, Walney Silva; Jorcin, Jean-BaptisteExtension of sensitized zone (SZ) in welded AISI 304 stainless steel was determined by two non-destructive electrochemical tests: double loop electrochemical potentiokinetic reactivation technique (DLEPR) and local electrochemical impedance spectroscopy (LEIS). Welding was carried out using the shielded metal arc with two selected welding energies: the first one (0.7kJmm¡1) does not promote the sensitization of...
Microstructural characterization of grade 300 and grade 350 maraging steels and...
Flórez, Mauro Andrés Cerra; Pereira, Úrsula Cid; Cardoso, Jorge Luiz; Oliveira, Francisco José dos Santos; Araújo, Walney Silva; Ribas, Gemma FargasThe electrochemical behavior of solution-annealed grade 300 and grade 350 maraging steels subjected to two different aging temperatures in an aqueous hydrofluoric acid (HF) medium was evaluated. The microstructural and hardness studies showed the effects of the chemical composition and heat treatments on the material properties. Although it is not possible to observe them, the fine intermetallic composites depo...
Embrittlement and aging at 475 °C in an experimental superferritic stainless st...
Moura, Lorena Braga; Abreu, Hamilton Ferreira Gomes de; Araújo, Walney Silva; Franco, João Felipe Bastos; Sampaio, Michael CarneiroSuperferritic steels are characterized by high Cr content (exceeding 25 wt.%) with addition of Mo. They were originally developed for use in heat exchangers and marine environments. Current trend to use these alloys in the oil industry drives the research on effect of the increased Mo content on the microstructure of these steels. Mo increases the resistance to naphthenic corrosion. The α'(alpha prime) phase pr...
Avaliação da resistência a corrosão de aços alto manganês e o aço 9% níquel em ...
Lima, Marcos Natan da Silva; Flórez, Mauro Andrés Cerra; Maia, Pedro Paulo Nunes; Araújo, Walney Silva; Abreu, Hamilton Ferreira Gomes deThe present study aims to evaluate the corrosion resistance of twohigh manganese steels with respect to the 9% Nickel steel in 0.001M NaCl electrolyte solution. For this research, twosteels with 22%, 27% manganese were used, and the alloy of 9% Nickel which is widely used in the petrochemical industry. The tests carried out to compare the corrosion resistance were the open circuit potential (OCP) and anodic lin...
Análise de microestrutural, de resistência à corrosão e de microdureza do aço A...
Silva Junior, Francisco Carlos Gomes da; Rodrigues, Matheus Souza; Mata, Stephany Aparecida Santos da; Machado, Janaína Gonçalves Maria da SilvaASTM 890 grade 3 stainless steel duplex (AID) has great use in the oil tube industry in Brazil and worldwide. The material of the time variation necessary to solubilize a material is important, therefore, by decreasing this time, it can become spent with an furnace. The objective of this paper is the comparison of results for the different solubilization times of ASTM 890 grade 3A molten duplex stainless steel....
Estudo da resistência à corrosão entre vergalhões com diferentes microestrutura...
Vieira, Matheus de Lima; Silva, Francisco Alberto Marreiros da Rocha da; Flórez, Mauro Andrés Cerra; Silva, Marcelo José Gomes da; Araújo, Walney SilvaThe rebar are produced by hot rolling process. In the process studied here there are two distinct production routes. Prior to the hot rolling process, one route uses the reheat step through the furnace, and the other uses the semi-finished steel product directly from the solidification process. When establishing a comparison between the routes, the obtained microstructures show some differences. The objective o...
Estudo de inibidor verde à base de aroeira (Myracrodruon Urundeuva fr. Allem) n...
Souza, Vitória Lima de; Araújo, Walney Silva; Romero, Francisco Belmino; Silveira, Edilberto Rocha; Leite, Adriana de Oliveira SousaThe use of green inhibitors in the corrosion of SAE J403 1020 carbon steel is an economical and environmentally accessible alternative because, regarding to the commercial inhibitors generally used, they are easily obtainable, and since they are acquired from vegetables, don't represent a risk to the environment. Thus, the present work aims to evaluate the use of aroeira leaves as a corrosion inhibitor for SAE ...
Avaliação da resistência a corrosão de dois aços alto manganês e o aço 9% níque...
Flórez, Mauro Andrés Cerra; Vieira, Matheus de Lima; Guedes, Thiago César Souza; Araújo, Walney Silva; Silva, Marcelo José Gomes daThe present study aims to evaluate the corrosion resistance of two high Manganese steels in relation to the 9%Nickel steel in electrolyte solution 0.001M of H2SO4. For this research, two steelswith 22% and 26% of Manganese were used, and the 9% Nickel steel that is widely used in petrochemical industry. The tests carried out to compare the corrosion resistance are: Open Circuit Potential (OCP) and Anodic Linear...
Caracterização dos mecanismos de corrosão para os aços inoxidáveis martensítico...
Lima, Darley da Silva; Araújo, Walney SilvaAs a final part of the steel production chain, continuous casting exposes its rollers to high process temperatures, thermal/mechanical fatigue, abrasive wear and corrosion damage. Martensitic stainless steels are the most widely used in industry and collapse from the emergence of failures as a result of the nucleation and propagation of pits and cracks. Pitting and crevice corrosion are the most common and the ...