Dynamic Recrystallization
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. 3D finite element modeling of grains refinement for magnesium alloys by extrusion-shear and experimental verification
To explore the deformation mechanisms of a new composite extrusion including extrusion and successive shear subsequently which is shorten "ES", Three dimensional finite element modeling of grain refinements for magnesium alloys by ES process has been researched. The ES die have been designed and manufactured and installed to the horizontal extruder. Finite e
Mat. Res.. Publicado em: 28/07/2014
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14. The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain
In order to investigate the compressive deformation behavior of 3Cr20Ni10W2 alloy, a series of isothermal upsetting experiments were carried out in the temperature range of 1203-1403 K and strain rate range of 0.01-10 s-1 on a Gleeble-1500 thermo-mechanical simulator. The results indicate that the flow stress initially increases to a peak value and then decr
Mat. Res.. Publicado em: 18/02/2014
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15. Effect of temperatures and strain rates on the average size of grains refined by dynamic recrystallization for as-extruded 42CrMo steel
In order to study the dynamic recrystallization (DRX) behavior of as-extruded 42CrMo high-strength steel, a series of isothermal upsetting experiments were carried out in a temperature range of 1123~1348 K and a strain rate range of 0.01~10 s-1 on Gleeble 1500. It was found that DRX softening is more recognizable at higher temperatures and lower strain rates
Mat. Res.. Publicado em: 18/06/2013
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16. A characterization for the flow behavior of as-extruded 7075 aluminum alloy by the improved Arrhenius model with variable parameters
In order to perform the numerical simulations of forging response and establish the processing parameters for as-extruded 7075 aluminum alloy, the compressive deformation behavior of as-extruded 7075 aluminum alloy were investigated at the temperatures of 573 K, 623 K, 673 K and 723 K and the strain rates of 0.01 s-1, 0.1 s-1, 1 s-1 and 10 s-1 on a Gleeble15
Mat. Res.. Publicado em: 13/11/2012
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17. Síntese, caracterização e polimerização de bis(metacrilamida)s
The aim of this study was the synthesis, characterization and investigation of kinetic behavior of photo- and thermal polymerization of 4,4-diphenylmethane-bis(methacrylamide) (BisFenil), N,N¿,hexamethylene-bis(methacrylamide) (BisHexa), N,N¿-decamethylene-bis(methacrylamide) (BisDeca) and N,N¿-dodecamethylene-bis(methacrylamide) (BisDodeca). Methacrylate
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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18. STUDY OF THE DYNAMIC RECRYSTALLIZATION DURING THE DEFORMATION THE HOT ONE OF A STEEL ISO 5832-9 / ESTUDO DA RECRISTALIZAÇÃO DINÂMICA DURANTE A DEFORMAÇÃO A QUENTE DE UM AÇO ISO 5832-9
Os aços inoxidáveis austeníticos possuem um baixo valor econômico quando comparados ao titânio e suas ligas, considerados os mais resistentes à corrosão em meio biológico, e há mais de cinquenta anos são amplamente utilizados na confecção de implantes ortopédicos, em especial no serviço de saúde pública. Atualmente o aço ISO 5832-1 (ASTM F 1
Publicado em: 2010
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19. Estudo da recristalização dinâmica do aço inoxidável austenítico F 138, utilizado em próteses ortopédicas
In order to analyze the microstructure and to know the dynamic softening mechanics that take place during the hot work in F 138 stainless steel, physical simulation was carried out through continuous isothermal hot torsion tests in a wide range of temperatures and strain rates, covering the real conditions of processing used in the manufacture of orthopedic
Publicado em: 2009
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20. Simulation of recrystallization in iron single crystals
Recrystallization of an iron single crystal was reported in detail by Vandermeer and Rath (V&R). We present predictions of recrystallization based on cellular automata (CA) simulations, and compare them with the data and analysis from V&R's study. Agreement is found between our CA simulations and V&R's results, provided that the CA simulations were carried o
Materials Research. Publicado em: 2008-03
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21. Formação de grãos ferríticos ultrafinos através de transformação de fase induzida por deformação / Ultrafine ferrite grains formation through dynamic straininduced transformation
One of the key points in steel development has been the refinement of the microstructure, however without change the chemical composition with addition of alloy elements. The refinement of the ferrite grain size leads simultaneously to an increase in strength and toughness. Ultrafine grains can be produced through thermomechanical controlled treatments, gene
Publicado em: 2007
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22. Microstructure and mechanical properties of Pb-4%Sb alloy processed by equal channel angular pressing
Equal Channel Angular Pressing (ECAP) is the most prominent SPD (Severe Plastic Deformation) method for the production of ultrafine and nanostructured metals, and has been extensively employed and analyzed. This technique was applied to a Pb-4%Sb alloy at room temperature, in order to study its effect on a low melting point and multiphase metallic material.
Materials Research. Publicado em: 2006-03
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23. Prediction of steel flow stresses under hot working conditions
An austenitic stainless steel was deformed in torsion over a temperature range of 900-1200 °C using strain rates of 1, 5 and 10 s-1. The stress vs. strain curves determined were corrected for deformation heating and the flow stress was found to rise in the initial work-hardening regime, reaching a maximum before dropping to the steady state due to softening
Materials Research. Publicado em: 2005-09
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24. Analise do processamento termomecanico de placas finas de aço microligado V-Nb com enfase na precipitação de carbonitretos
The seeking for new technologies that aim costs reduction and quality and productivity improvement has pushed the steelmakers to develop the near-net shape casting processes. In this work it will be showed the results of the thin slabs solidification, one of these technologies, using the Thin Slabs Casting Simulator (TSCS) of the Materiais Engineering Depart
Publicado em: 2004