11 documents found, page 1 of 2
The effect of prior austenite grain size on hydrogen embrittlement of Cocontain...
Silva, Marcelo José Gomes da; Cardoso, Jorge Luiz; Carvalho, Dayane de Sousa; Santos, Luis Paulo Mourão dos; Herculano, Luís Flávio GasparThe effects of the prior austenite grain sizes in hydrogen embrittlement of Co-containing 18Ni 300 maraging steel were studied employing Slow Strain Rate Testing (SSRT) in 0.6 M NaCl electrolyte under simultaneuos cathodic polarization. The material was susceptible to hydrogen embrittlement in all investigated conditions. In addition, the examination of the fractured surface revealed that the presence of hydrog...
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...
Oxidation behavior of Maraging 300 Alloy exposed to nitrogen/water vapor atmosp...
Flórez, Mauro Andrés Cerra; Ribas, Gemma Fargas; Cardoso, Jorge Luiz; García, Antonio Manuel Mateo; Rovira, Joan Josep Roa; Bastos Neto, MoisésAging heat treatments in maraging steels are fundamental to achieve the excellent mechanical properties required in several industries, i.e., nuclear, automotive, etc. In this research, samples of maraging 300 alloy were aged using a novel procedure that combines different steps with two atmospheres (nitrogen and water vapor) for several hours. The oxidized surface layer was chemical, microstructural and microm...
Corrosion behavior of austenitic stainless steels in CO2-saturated synthetic oi...
Cardoso, Jorge Luiz; Mandel, Marcel; Krüger, Lutz; Herculano, Luís Flávio Gaspar; Lima Neto, Pedro de; Silva, Marcelo José Gomes daThe corrosion behavior of austenitic and superaustenitic stainless steels was investigated in carbon dioxide-saturated synthetic oil field formation water using cyclic polarization tests. In order to measure the effect of carbon dioxide pressure, the samples were also exposed in a pressurized medium containing carbon dioxide and synthetic air. For this purpose, tests were performed for long exposure time at 80 ...
Avaliação e comparação da resistência à corrosão por pites do aço super austení...
Silva, Marcelo José Gomes da; Cardoso, Jorge Luiz; Cavalcante, Alfredo Leão Silva Nunes; Lima Neto, Pedro de; Abreu, Hamilton Ferreira Gomes deThe pitting corrosion resistance of a super austenitic AL-6XN PLUS™ stainless steel (ASA) and of an austenitic 317L stainless steel was investigated using the cyclic polarization technique following the standard ASTM G61-86. These materials were evaluated in the as received condition and heat treated ranging from 500ºC and 900ºC during 72 h. Super austenitic steels are derived from austenitic 317L steel, theref...
Influência da temperatura na resistência à corrosão por CO2 DO aço 904L
Dias, Diego Henrique Fonteles; Cardoso, Jorge Luiz; Lima Neto, Pedro de; Silva, Marcelo José Gomes daThe resistance to corrosion by CO2 of 904L superaustenitic steel was investigated using the technique of linear polarization. Heat treatments were performed on samples of 904L steel to simulate the effect of temperature on the resistance to corrosion by CO2. The temperature selected to heat treatments was 760ºC. Samples in the as received condition were also evaluated. The samples were immersed in artificial wa...
Avaliação e comparação da resistência à corrosão por pites dos aços 304L E 316L
Cardoso, Jorge Luiz; Cavalcante, Alfredo Leão Silva Nunes; Belo, Jardel de Souza; Lima Neto, Pedro de; Silva, Marcelo José Gomes daA resistência à corrosão por pites dos aços inoxidáveis austeníticos AISI 304L e 316L foi investigada utilizando a técnica de polarização cíclica seguindo a norma ASTM G61-86. Foi realizada uma simulação termodinâmica utilizando o software Thermo-Calc para prever possíveis fases deletérias nas temperaturas selecionadas. As simulações previam a fase sigma na faixa de temperatura selecionada. Estes materiais fora...
Resistência à corrosão dos aços inoxidáveis austenítico e super austenítico em ...
Sousa, João Matheus Batista Amaro de; Cardoso, Jorge Luiz; Lima Neto, Pedro de; Silva, Marcelo José Gomes daThe pre-salt region is very hostile to the materials used in such environment due to some factors found under the pre-salt layer such as: corrosive gases, oil formation water, high pressures and so on. In order to evaluate only the effect of the oil field formation water on the corrosion resistance of austenitic stainless steels in such environment, two austenitic and two superaustenitic stainless steels were t...
Study of mangetic properties of maraging 350 steel as a fucntion of grain size
Araújo, Jônatas Targino; Cardoso, Jorge Luiz; Tavares, Sérgio Souto Maior; Pardal, Juan Manuel; Silva, Marcelo José Gomes daThe magnetic properties of the maraging 350 steel were analyzed in four different grain sizes. The applications of maraging steels can be found in several fields such as aeronautics, super centrifuges, navy, etc. Thus, this kind of steel must combine excellent mechanical properties with good magnetic ones. Microstructure and grain size can affect these properties. In order to evaluate the influence of grain siz...
Avaliação e comparação da resistência à corrosão por pites do aço superaustenít...
Cardoso, Jorge LuizThe oil distillation towers routinely suffer problems related to corrosion due to the high level of acidity present in the oil requiring a high resistance to corrosion of the equipment in use. Among the materials used in the manufacturing and coating of equipment, we highlight the Austenitic Stainless Steel of the 300 Series. Austenitic stainless steels are widely used in components for high temperatures, such ...