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Avaliação da estrutura e da resistência mecânica de aços IF nitretados a plasma com pré-encruamento
(Universidade Federal de Minas GeraisUFMG, 2014-02-27)
In this study the mechanical properties of IF steel surface modified by plasma nitriding process in triode configuration for 4 hours at temperatures of 450°C, 475°C and 500°C were investigated. Physical, morphological ...
Efeito da deformação a frio e recozimento sobre a microestrutura, textura e propriedades mecânicas de um aço baixo C contendo 17%Mn
(Universidade Federal de Minas GeraisUFMG, 2013-12-20)
Steels containing high Mn, Si and Al have a great formability combined with a high mechanical strength. This excellent mechanical performance occurs due to twinning, TWIP effect (Twinning Induced Plasticity), or martensitic ...
Avaliação do efeito de modificações superficiais a plasma no desempenho do aço AISI 316 frente ao desgaste e corrosão
(Universidade Federal de Minas GeraisUFMG, 2011-06-13)
In order to improve the sliding wear, cavitation erosion and corrosion resistance of AISI 316 stainless steel, two surface treatments have been realized: Thermochemical plasma diffusion and PAPVD film deposition (Plasma ...
Efeito da adição de reagentes agregantes e de ligantes sobre a consistência em pastas minerais
(Universidade Federal de Minas GeraisUFMG, 2007-02-12)
Current deposition of tailings from mineral processing operations is still based upon the sub aqueous disposal of tailings into tailings ponds, created by dams erected in natural valleys. On the other hand, surface disposal ...
Análise numérica do processo de fratura no ensaio de indentação vickers em uma liga de carboneto de tungstênio com cobalto
(Universidade Federal de Minas GeraisUFMG, 2004-03-30)
The Vickers indentation testing has been used for decades for surface hardness evaluation of ceramic, metallic and composite materials. Recently, researchers have developed new techniques based on this test in order to ...
Caracterização dos minerais do grupo da apatita e carbonatos no minério sílico-carbonatado de Catalão, GO, e sua relevância no processo de flotação
(Universidade Federal de Minas GeraisUFMG, 2018-04-25)
Sample of the silico-carbonate ore (SIC) of Catalão, Goiás, was analyzed and submitted to the mineral processing routes designed for the Catalão (Catalão I) and Araxá (Barreiro) deposits ores. Although both are located in ...
Modelamento matemático do escoamento turbulento, da transferência de calor e da solidificação no distribuidor e na máquina de lingotamento contínuo
(Universidade Federal de Minas GeraisUFMG, 2004-04-15)
In the present work a group of mathematical models for the continuous casting processn and their principal phenomena was developed. The models comprise the tundish and the strand of the continuous casting machine. The model ...
Caracterização microestrutural e mineralógica de minérios de ferro itabiríticos com graus diferentes de complexidade
(Universidade Federal de Minas GeraisUFMG, 2014-02-26)
Mineral characterization is a broad and important topic in the academic context, because there are still gaps in the composition and/or microstructure of the ores found. Due to the complexity of existing itabirite ores in ...
Modelamento estatístico do consumo de carvão vegetal dos altos-fornos da Vallourec Tubos do Brasil em função da produção de ferro-gusa e das cargas ferrosas
(Universidade Federal de Minas GeraisUFMG, 2014-11-13)
Hot metal manufacturing process in charcoal blast furnaces, besides complex, represents the largest cost of an integrated plant due to the high prices of the raw materials. A great problem of this operation type is the low ...
Efeito de magnésias com diferentes aditivos nas estruturas e propriedades de aço elétrico de grão orientado
(Universidade Federal de Minas GeraisUFMG, 2011-06-20)
Grain oriented electrical steel has as their major characteristics the excellent magnetic properties, specially developed for reducing core losses and to increase the efficiency of electrical machines. During the manufacturing ...