Metallography
Mostrando 1-12 de 58 artigos, teses e dissertações.
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1. Towards Qualification of Friction Stir Welding to AA5083-O and AA5052-O Aluminum Alloys
Friction Stir Welding (FSW) is an excellent alternative for joining dissimilar and similar materials in comparison to conventional welding processes. In this sense, this work aims at qualifying FSW to similar AA5083-O and AA5052-O aluminum alloys, with 6.35 mm thickness, in a CNC machining center. Therefore, four welding experiments were undertaken. At first
Mat. Res.. Publicado em: 13/01/2020
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2. Characterization and Comparative Analysis of Corrosion Resistance of 4 High Manganese Steels Models in Aqueous Solution of NaCl
The liquefied natural gas volumes that currently need to be stored and/or transported require engineering to consistently develop materials that combine high mechanical strength and low manufacturing costs. The present work brings the study of four models of high manganese steels (non-commercials), to demonstrate the feasibility of being used in the petroche
Mat. Res.. Publicado em: 09/12/2019
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3. Avaliação da susceptibilidade à corrosão de um aço inoxidável AISI 316L submetido à simulação térmica com o uso da Gleeble
RESUMO Este trabalho teve como finalidade avaliar a influência do tamanho médio dos grãos na susceptibilidade à corrosão do aço inoxidável austenítico AISI 316L, cujo material é bastante utilizado em juntas soldadas, em temperatura ambiente e em baixíssimas temperaturas (condições criogênicas) por apresentar excelente resistência à corrosão e
Matéria (Rio J.). Publicado em: 16/09/2019
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4. Influência do Regime Transiente Sobre a Microdureza e Microestrutura nos Aços ASTM-A36 e SAE-1045 Soldados pelo Processo MAG
Resumo O regime quase-estacionário pode não ser alcançado em soldagens a arco elétrico de peças de pequenas dimensões e/ou de materiais de maior condutividade térmica. Entretanto, o regime transiente sempre ocorrerá no início e no final da soldagem. Neste regime, a variação do fluxo de energia via calor pode promover variações microestruturais e
Soldag. insp.. Publicado em: 08/08/2019
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5. Electrolytic polishing of compacted graphite iron for revealing subsurface graphite of honed cylinders
ABSTRACT The superficial characteristics of honed surfaces are relevant for the tribological performance of cylinders of internal combustion engines (MCI). Recent studies found a correlation between the occurrence of the phenomenon called folded metal and the presence of graphite of cast irons. However, the honing process tends to overlap the graphite, such
Matéria (Rio J.). Publicado em: 20/05/2019
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6. Submerged Friction Stir Welding of 6061-T6 Aluminium Alloy under Different Water Heads
The aim of this paper is to determine the feasibility of submerged friction stir welding of 6061-T6 aluminium alloy on different water heads through macrostructuralanalysis.In this work, aluminium 6061-T6 alloy was friction stir welded under normal and submerged conditions at different rotational speeds of 400 rpm, 800 rpm, 1200 rpm, 1600 rpm. The water head
Mat. Res.. Publicado em: 01/11/2018
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7. Análisis comparativo en la determinación de ferrita delta para aceros inoxidables austeníticos
ABSTRACT In the welding of austenitic stainless steels, the determination of delta ferrite (δ-ferrite) is very important to assess the susceptibility of weld metal to hot cracking, one of the major problems related to weldability, metallurgical and mechanical behavior of this type of steels. The determining δ-ferrite in the weld metal can be performed with
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Diagrama de fases experimental Fe-Sn-Zr. Nuevos resultados del corte isotérmico de 800 °C
ABSTRACT The Zr-based alloys are extensively applied in the field of nuclear technology. Alloyed with Sn and Fe, Zr is the main element in the zircaloy-type alloys, currently vastly used as structural elements and as containers of burnable elements in nuclear reactors. This ternary metallurgical system is also a component of more recently developed alloys su
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Espuma ultraliviana de Mg a partir de viruta reciclada
ABSTRACT Hundreds of people worldwide die or are severely maimed in collisions during traffic accidents, due to the energy transmitted to the passengers on impact. A dissipation of said energy is necessary to minimize it's effects, which can be achieved through absorbers. In recent years, metallic foams have started to be considered as energy absorbers. Meta
Matéria (Rio J.). Publicado em: 19/07/2018
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10. Evaluation of the Influence of Surface Finishing on the Corrosion Resistance of HVOF Applied Inconel 625 Coatings on Steel
In this work, the corrosion resistance of Inconel 625 coatings applied to AISI 4140 steel plates was evaluated. Coatings were produced by High Velocity Oxygen Fuel (HVOF) by use of two different equipment which use either kerosene (liquid) or propane (gas) as fuel. The resulting coatings were evaluated in two conditions: as-deposited and after a surface fini
Mat. Res.. Publicado em: 18/12/2017
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11. Microstructural characterization of the A356 alloy in different processing routes used in the thixoforming process
ABSTRACT This work aims to evaluate different routes of raw material production to be used in thixoforming process. The semisolid materials exhibit particular structural characteristics, such the characteristic non dendritic structure. The studies for the production of near-net-shape parts have progressed together with the studies of material weight reductio
Matéria (Rio J.). Publicado em: 02/10/2017
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12. Effects of Solidification Rate in the Microstructure of Al-Si5Cu3 Aluminum Cast Alloy
Aluminium alloy Al-Si5Cu3 (319) is one of the most commonly used casting alloys for automobile components, due to its casting characteristics. Iron is the major impurity element that influences the detrimental β-phase formation in secondary aluminum alloys. In the present study, we investigated the influence of the cooling rate on the formation of iron comp
Mat. Res.. Publicado em: 20/07/2017