Dilatometry
Mostrando 13-24 de 52 artigos, teses e dissertações.
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13. Characterization of Phase Transformations and Microstructural Changes in an API 5CT L80 Steel Grade During Ni Alloy Laser Cladding
The superficial coatings in micro-alloyed steel pipes has been a pointed way to decrease the corrosion problems in oil and gas industry. However, little emphasis has been given to the substrate. The effects of the deposition method on the steel microstructure and properties are still not well described. In this context, this work studied the effect of Ni sup
Mat. Res.. Publicado em: 26/07/2018
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14. Evolución microestructural durante el envejecimiento a alta temperatura de una aleación 35Ni-25Cr-Nb
ABSTRACT The dendritic-type microstructure of the 35Ni-25Cr-Nb alloy, in the as-cast condition, consists of an austenitic matrix and two types of eutectic primary carbides; Nb-rich MC type and Cr-rich M23C6 type both presents in interdendritic edges and grain boundaries. During aging at 800ºC for different times, M23C6 type secondary carbides precipitate in
Matéria (Rio J.). Publicado em: 19/07/2018
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15. Preparation and Characterization of Mullite-Alumina Structures Formed "In Situ" from Calcined Alumina and Different Grades of Synthetic Amorphous Silica
The in situ reaction between alumina and silica to obtain mullite (Al6Si4O13) can be significantly affected by using synthetic amorphous silica (SAS) sources instead of crystalline ones (quartz and cristobalite). For instance, SASs promote early mullite formation (below 1300°C) and greater densification during sintering. This paper reports the "in situ" for
Mat. Res.. Publicado em: 12/03/2018
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16. Métodos de determinación de la cinética de hidratación mediante la retracción química y parámetros que lo influencian
Abstract Measuring chemical shrinkage provides information about the development of hydration kinetics of cementitious materials. It is also related to the degree and heat of hydration. To determine chemical shrinkage, volume change caused by the hydration reactions in a sample of cement paste under saturation conditions is quantified. There are three method
Ambient. constr.. Publicado em: 2017-12
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17. A Dilatometric Study of the Influence of Residual Iron Content on the Annealing Behavior of Cartridge Brass
Solid solutions alloys may have their annealing behavior affected by solute concentration. Mathematical models assume complex equations with parameters of hard and tedious assessment making empirical tests rather necessary. This work evaluated the residual iron content (from ~100 ppm to ~600 ppm) influence on annealing of a cartridge brass. Dilatometry resul
Mat. Res.. Publicado em: 15/03/2016
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18. Effect of Microstructure on the Thermal Properties of Sintered Iron-copper Composites
Copper is a well know material for use as heat sink or heat exchanger. However, copper has a considerable low tensile strength and temperature limit. A material that has a good thermal conductivity, low cost, but also resistance is the desired. Effects of copper on the sintering and thermal properties of iron-copper composites produced by powder metallurgy a
Mat. Res.. Publicado em: 2015-12
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19. Adjusting the Sintering Cycle of a Hadfield Sintered Steel Produced by Metal Injection Molding
Processing of high manganese austenitic sintered steels present several challenges concerning thermodynamic reactions that occur during the sintering of these materials such as Mn oxidation, sublimation and even the formation of liquid phases or undesired compounds, e.g. grain boundary carbides. Therefore it is extremely important to adjust the sintering par
Mat. Res.. Publicado em: 17/11/2015
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20. Corrosion and microstructural characterization of martensitic stainless steels submitted to industrial thermal processes for use in surgical tools
INTRODUCTION: The mechanical properties and corrosion resistance of a material are dependent on its microstructure and can be modified by phase transformation. When a phase transformation occurs in a material it usually forms at least one new phase, with physical-chemical characteristics that differ from the original phase. Moreover, most phase transformatio
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-09
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21. Microstructural characterization and mechanical behavior of a low-carbon 17%Mn steel
Steels containing high levels of Mn, Si and Al exhibit high plasticity when deformed, owing to twinning-induced plastitity (TWIP) and transformation-induced plasticity (TRIP) effects. In this study, we investigated the microstructural evolution of samples of samples of a 17%Mn steel subjected to war rolling at 700º and 800ºC. We also studied the effects of
Mat. Res.. Publicado em: 27/05/2014
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22. Efeito da ativação mecânica de uma formulação de talco/caulim/alumina sobre o mecanismo e a cinética de formação de cordierita
In this study, the influence of mechanical activation by intensive ball milling of a stoichiometric mixture of talc, kaolin, and alumina on the mechanism and kinetics of cordierite (2MgO·2Al2O3·5SiO2) formation was evaluated. The raw materials were characterized by chemical analysis, X-ray diffraction (XRD), laser diffraction, and helium pycnometry. The ki
Quím. Nova. Publicado em: 2014-04
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23. Comparison of polymers and ceramics in new and discarded electrical insulators: reuse and recycling possibilities
The expansion and maintenance of electricity distribution networks generates large amounts of waste, much of it in the form of discarded insulators that are not reused or recycled. This paper describes the results of tests on used and new ceramic and polymeric insulators to verify if their exposure to weathering justifies their replacement. In new and used c
Matéria (Rio J.). Publicado em: 2013-12
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24. A dilatometric study of the phase transformations in 300 and 350 maraging steels during continuous heating rates
The influences of the chemical composition and heating rate have been studied in 300 and 350 maraging steels using dilatometry. For these tests, heating was carried out with heating rates of 1, 10 and 28 °C/s. The results have shown that the precipitation mechanism for both materials in the studied range is by lattice diffusion. Furthermore, Co and Ti conte
Mat. Res.. Publicado em: 10/05/2013