Carbides Morphology
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Efeito do tamanho do abrasivo no desgaste de metais. / The effect of abrasive size on the wear resistance of metallic materials.
In this research, the effect of abrasive size on the wear resistance of five metallic materials was investigated. Abrasive wear tests using a pin test on alumina paper were carried out using abrasive sizes between 16 µm and 192 µm. The wear surface of the specimens was examined by scanning electron microscopy for identifying the wear micromechanism and the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/06/2010
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2. Nucleation and growth of austenite/VC eutectic in alloys of the Fe-V-C system. / Nucleação e crescimento do eutético austenita/VC em ligas do sistema Fe-V-C.
The three most commercially important families of alloys for the foundry industry show the formation of faceted/non-faceted eutectics type during solidification: cast irons with graphite (austenite/graphite eutectic), white cast irons (austenite/carbide eutectic) and Al-Si alloys (alfa/silicon eutectic). In the case of white cast irons, the eutectic carbide
Publicado em: 2008
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3. Desgaste e fadiga térmica de ligas aço matriz + NbC. / Wear and thermal fatigue of matrix steel + NbCalloys.
The concept of ?matrix steel + NbC? was used to cast alloys with the M2 steel matrix (0,5%C ? 2%W ? 3%Mo ? 4,6%Cr ? 1%V) and different volume fractions of niobium carbides. Niobium (2,5 e 5%) and stoichiometric carbon were added to produce NbC carbides and titanium (0,1%) to modify de NbC carbides morphology. NbC presented three basic morphologies: Chinese s
Publicado em: 2006
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4. Contribuição aos estudos dos Mecanismos de Interação das Partículas Abrasivas com as Microestruturas de Ferros Fundidos em Processo de Desgaste
The evaluation of wear (loss of mass during time) of some mechanical components used in circuits of iron ore slurry pumping represents an economical relevant problem in mining industry. Cast irons with high chromium content is the most frequently material having desired properties for this application. The aim of this study is to contribute to the understand
Publicado em: 2004
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5. Fadiga térmica de ferros fundidos brancos multicomponentes. / Thermal fatigue of multicomponent white cast iron.
The effects of the volume fraction of eutectic carbides and of the matrix hardness on the thermal fatigue resistance of multicomponent white cast iron were investigated. Alloys Fe-4Cr-V-2Mo-2W-2C, V ranging from 5 to 8 wt% and Fe-4Cr-8V-Mo-2W-2C, Mo ranging from 2 to 5 wt % were used. Disc shaped samples were quench and tempered for obtaining two matrix micr
Publicado em: 2003