Temper
Mostrando 1-12 de 39 artigos, teses e dissertações.
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1. COMPREENDENDO OS MECANISMOS DE CORROSÃO DE LIGAS DE AL-CU-LI: UMA INVESTIGAÇÃO ATRAVÉS DE TÉCNICAS ELETROQUÍMICAS GLOBAIS E LOCAIS
In this study, the corrosion mechanism of an Al-Cu-Li alloy manufactured by two different treatment routes (T3 and T851) was evaluated by immersion and electrochemical tests in solutions containing chloride ions (Cl-). For both alloys, the formation of cavities on the surface was associated with micrometer-sized intermetallics (IM’s), however, in addition
Química Nova. Publicado em: 2022
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2. Efecto del tratamiento térmico sobre la resistencia mecánica, corrosión intergranular y exfoliación de la aleación de aluminio 7075
ABSTRACT In this study, the effects of heat treatments in the peak aged (T6), overaged (T73) and retrogression and reaging (RRA, retrogression at 200 °C for 10 min) on the microstructure, mechanical strength, exfoliation corrosion and intergranular corrosion of aluminum alloy 7075, has been investigated by optical microscope, scanning electron microscopy, t
Matéria (Rio J.). Publicado em: 19/07/2018
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3. Estudio de la formabilidad en caliente de aleaciones de titanio a través del ensayo de torsión y su aplicación a la optimización de procesos de forja y extrusión
ABSTRACT In the development of hot metal forming, the metallic products must comply with the requirements imposed by current standards. In some cases, the required microstructure can only be obtained through thermomechanical processing. With titanium and its alloys, small ranges of good workability are an additional difficulty. In this work the hot-workabili
Matéria (Rio J.). Publicado em: 19/07/2018
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4. Effects of Two Different Cyclic Heat Treatments on Microstructure and Mechanical Properties of Ti-V Microalloyed Steel
In this work the effects of two different cyclic heat treatments (traditional route and new-designed route, named as Route 1 and Route 2, respectively) on microstructure and mechanical properties of Ti-V microalloyed steel were investigated. The results showed that the mean grain size initially decreased on execution of 1-cycle (~13.9 μm) and then remained
Mat. Res.. Publicado em: 2015-04
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5. São Paulo urban heat islands have a higher incidence of dengue than other urban areas
Urban heat islands are characterized by high land surface temperature, low humidity, and poor vegetation, and considered to favor the transmission of the mosquito-borne dengue fever that is transmitted by the Aedes aegypti mosquito. We analyzed the recorded dengue incidence in Sao Paulo city, Brazil, in 2010-2011, in terms of multiple environmental and socio
Braz J Infect Dis. Publicado em: 2015-04
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6. The Role of cobalt and nickel intermetallic phases on the mechanical properties and microstructure evolution of Al-Zn-Mg-Cu alloys
In this study, the effects of cobalt and nickel additions on microstructure evolution and mechanical properties of Al-Zn-Mg-Cu alloys produced by chill casting process were investigated. Al-Zn-Mg-Cu aluminum alloys containing Ni and Co additives were homogenized at different heat treatment conditions, aged at 120ºC for 24 h, and retrogressed at 180ºC for 3
Mat. Res.. Publicado em: 2014-12
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7. Evaluation of a 7050-TAF aluminum alloy submitted to creep age forming
CAF process combines creep and precipitation hardening which are highly dependent on time and temperature. The aging cycle relax the stresses induced during the loading phase. At the end of the process stress relaxation induces shape changes in the part but significant spring back is observed (about 70%). Usually CAF cycles for 7XXX alloys use times around 2
Mat. Res.. Publicado em: 29/04/2014
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8. Irritability in children and adolescents: past concepts, current debates, and future opportunities
Irritability is defined as a low threshold to experience anger in response to frustration. It is one of the most common symptoms in youth and is part of the clinical presentation of several disorders. Irritability can present early in life and is a predictor of long-term psychopathology; yet, the diagnostic status of irritability is a matter of intense debat
Rev. Bras. Psiquiatr.. Publicado em: 2013
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9. Efeitos do revenimento realizado a baixa temperatura na resistência ao impacto em aços carbono e ligados temperados
This work has as main objective the determination of mechanical behavior, specially the impact resistance of martensitic structures based on carbon and on alloyed steels. The main concern is the response of these alloys when tempering at low temperatures (below 180C). Heat treatments were performed by quenching in water and oil in order to determine the seve
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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10. Efeito das adições de tratamentos criogênicos e de alívio de tensões no ciclo térmico do aço ferramenta AISI D2. / The effect of cryogenic and stress relief treatments additions in the thermal cycle of the AISI D2 tool steel.
Foram estudados os efeitos da introdução de etapas de tratamento criogênico e do alívio de tensões no ciclo térmico do aço ferramenta para trabalho a frio AISI D2. Variaram-se as temperaturas de tratamento criogênico, sendo elas principalmente: criogênica (-196°C) e subzero (-80°C). Foram variados os tempos de permanência às temperaturas criogê
Publicado em: 2011
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11. Modelagem temporal de sistemas : uma abordagem fundamentada em redes de petri / Temporal modeling of information systems: a Petri net based approach
Neste trabalho e proposta a abordagem TempER-Tr, uma técnica de modelagem conceitual, fundamentada em rede de Petri, que integra a especificação das propriedades dinâmicas de um sistema a um modelo de dados temporal do tipo entidade relacionamento. Um modelo ou esquema conceitual descreve as propriedades identificadas de um sistema a ser desenvolvido. Es
Publicado em: 2010
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12. Aplicação da técnica da dupla camada na soldagem de dutos em operação
A intervenção por soldagem em dutos em operação adquiriu nos últimos anos extrema importância na indústria do petróleo, visto que por meio dela é possível instalar derivações bem como reparar trechos danificados na malha dutoviária sem a interrupção do fluxo dos produtos escoados, o que certamente impactaria em elevados custos nas operações.
Publicado em: 2010