Hardening
Mostrando 13-24 de 291 artigos, teses e dissertações.
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13. Effect of cold-working process on cyclic deformation of electrolytic copper
Abstract Cyclic softening and hardening processes are expressed by the change in the stress amplitude necessary to cause a given strain amplitude. Understanding the cyclic stress-strain behavior of materials is an important step in the complex study of their fatigue behavior. The potential differences between the defect structures of cold-formed materials ma
REM, Int. Eng. J.. Publicado em: 19/06/2019
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14. Copper slag from different dumps in the Atacama Region used in mortars as partial replacement of cement
ABSTRACT The use of copper slag as a partial substitute for cement in mortar preparation was studied. Copper slag samples were collected from three dumps in the Atacama Region (Northern Chile). Mortars of 40x40x160 mm (width, height, length) and curing times of 7, 28 and 90 days were used in mechanical testing. Tests were performed with 0% (control mortar),
Matéria (Rio J.). Publicado em: 10/06/2019
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15. Study on impact of fiber hybridization in material properties of engineered cementitious composites
ABSTRATO Compósito Cimentício Projetado (ECC) é um tipo de compósitos cimentícios reforçados com fibras de alto desempenho melhorados com bom comportamento de tração, compressão e flexão. O ECC é conhecido por seu comportamento de endurecimento de tensão sob tensão e tem sido cada vez mais aplicado na prática de engenharia. O processo de adicio
Matéria (Rio J.). Publicado em: 10/06/2019
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16. Devenir habitante de calle en una ciudad fronteriza del norte de México: Deportación, consumo de drogas y violencias
Resumo: Este artigo aborda os processos estruturais e fatores contextuais da fronteira EUA-México, que emolduraram a decisão de alguns deportados de viver nas ruas de cidade fronteiriça de Tijuana durante as primeiras décadas do século 21. Com base em uma pesquisa etnográfica e na construção de dados longitudinais, o artigo analisa como a deportaçã
Civitas, Rev. Ciênc. Soc.. Publicado em: 08/04/2019
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17. Intercritical Heat Treatment Temperature Dependence of Mechanical Properties and Corrosion Resistance of Dual Phase Steel
Abstract This study investigated the effect of intercritical heat treatment temperature on the tensile properties, work hardening and corrosion resistance of dual phase steel. Ferrite-martensite dual phase steel with different martensite volume fractions were obtained after heat treatment at different intercritical temperatures. Microstructure, mechanical pr
Mat. Res.. Publicado em: 17/01/2019
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18. Influence of High Current-Density Impulses on the Stress-Strain Response and Microstructural Evolution of the Single Crystal Superalloy CMSX-4
Owing to the low formability of single-crystal nickel-based materials, single-crystal components are typically cast. Subsequently, a multi-stage heat treatment is carried out in order to partially compensate the dendrite segregation and to stabilize the precipitated γ’-phase. Such components possess a high resistance to creep at elevated temperatures. Sin
Mat. Res.. Publicado em: 22/10/2018
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19. Propagación del banano: técnicas tradicionales, nuevas tecnologías e innovaciones
Abstract The different propagation systems for the banana: conventional or by tissue culture are reviewed. Conventional propagation, mainly using suckers, whole rhizomes or bits are still in use for familiar plantings or in farms for local markets in many tropical countries, while vitroplants are the rule in modern commercial banana cultivation. After exami
Rev. Bras. Frutic.. Publicado em: 17/09/2018
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20. Analysis of β´(Cu4Ti) Precipitation During Isothermal Aging of a Cu-4wt.%Ti Alloy
This work analyzed experimental and numerically the growth kinetics of β´precipitation of a Cu-4wt.%Ti alloy after aging at 400, 500 and 600 ºC for times from 0.0166 h to 200 h. Results indicated that the precipitation process is almost controlled by nucleation and growth during aging at 400 ºC, originating a slow growth kinetics of precipitation. In con
Mat. Res.. Publicado em: 09/08/2018
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21. The effect of the austenite grain refinement on the tensile and impact properties of cast Hadfield steel
This paper studied the effect of the austenite grain refinement on the tensile and impact properties of a cast Hadfield steel (12 % Mn, 1.2 %C and 0.65 % Si). The austenite grain refinement was obtained by hafnium inoculation. Microstructural characterization showed that the Hf-refined cast Hadfield steel featured a grain size of 600 µm, while the non-refin
Mat. Res.. Publicado em: 02/08/2018
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22. Extensión de durabilidad de pistones de bombas de fractura hidráulica mediante el empleo de tecnología de nitruración por plasma y PVD
ABSTRACT Hydraulic stimulation technique consists of "fracturing" the formation (rock reservoirs) through pumping a fracturing fluid downhole. This operation is performed by using hydraulic fracturing pumps. The pistons of these pumps are mechanical components performing the intake and compressing fracture fluid by reciprocating action. During this alternati
Matéria (Rio J.). Publicado em: 19/07/2018
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23. Determinación de los parámetros de austenización intercrítica para el desarrollo de aceros multifásicos mediante análisis dilatométrico
ABSTRACT The Multiphase steels are materials with exceptional mechanical properties including high strength, excellent ductility and hardening coefficient and good conformability. These properties are related with the microstructure, which can be a combination of ferrite and martensite (Dual phase steels) or more complex microstructures with ferrite, bainite
Matéria (Rio J.). Publicado em: 19/07/2018
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24. Evolución microestructural de una aleación de aluminio A356 con y sin reforzamiento. de SiC sometida a molienda mecánica
ABSTRACT The effect of milling time on the crystallite size, microstrain and Vickers microhardness, of an aluminum alloy A356 (Al-7wt % Si) with and without SiC reinforcement (15 wt%) was studied. The metal alloy powders were obtained by the rotating electrode process (REP) from cylinders of the alloy, the obtained powders present spherical morphology with a
Matéria (Rio J.). Publicado em: 19/07/2018