Quantitative Metallography
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Ferrite Quantification Methodologies for Duplex Stainless Steel
ABSTRACT In order to quantify ferrite content, three techniques, XRD, ferritoscope and optical metallography, were applied to a duplex stainless steel UNS S31803 solution-treated for 30 min at 1,000, 1,100 and 1,200 °C, and then compared to equilibrium of phases predicted by ThermoCalc® simulation. As expected, the microstructure is composed only by austen
J. Aerosp. Technol. Manag.. Publicado em: 2016-09
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2. Avaliação comparativa de propriedades geradas pelos processos de soldagem TIG e brasagem em uma liga odontológica à base de Ni-Cr / Comparative assessment of properties generated by the process of TIG welding and brazing in a Ni-Cr dental alloy
The purpose of this study was to compare, by means of microhardness testing and metallurgical characterization techniques as metallography, optical microscopy, scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS), mechanical and metallurgical properties of welded joints by TIG and brazing methods in a dental alloy based on Ni-Cr (FIT-C
Publicado em: 2009
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3. CORRELAÇÃO ENTRE MICROESTRUTURA E VIDA-FADIGA EM FERROS FUNDIDOS NODULARES / CORRELATION BETWEEN MICROSTRUCTURE AND FATIGUE LIFE IN NODULAR CAST IRONS
Esta pesquisa teve como objetivo avaliar a vida-fadiga de dois ferros fundidos nodulares modificados metalurgicamente, sendo uma classe predominantemente ferrítica e outra.perlítica. Inicialmente, amostra dos dois ferros fundidos nodulares ferrítico e perlítico foram fundidas adotando-se moldação em areia na geometria padrão Y-block. Em seqüência, c
Publicado em: 2004
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4. FATIGUE LIFE OF A FERRITIC NODULAR CAST IRON OF DIFFERENT MICROSTRUCTURES. / VIDA EM FADIGA DE UM FERRO FUNDIDO NODULAR FERRÍTICO COM VARIAÇÕES MICROESTRUTURAIS
Esta pesquisa teve como objetivos promover variações microestruturais em um ferro fundido nodular ferrítico tipo ASTM A536 60-40-18, pelo do uso de resfriadores durante a solidificação do material e pela adoção de tratamentos térmicos pós-fundição, bem como avaliar a influência de tais variações microestruturais sobre as propriedades mecânicas
Publicado em: 2003
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5. Microstructural Evolution of Ultra Fine Grained C-Mn Steel Warm Rolling and Intercritical Annea
The attainment of finer ferrite grain structure in low carbon is object of interest because significantly higher yield strengths and lower ductile-brittle transition temperatures can be predicted at the same time with ultra-fine grain sizes. This work verified the microstructural evolution of a low carbon 0.15%C-1.39%Mn steel after an ice brine quenching fro
Materials Research. Publicado em: 2002-09
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6. Quantification of Damage Progression in a Thermally Aged Duplex Stainless Steel
Ferrite of austeno-ferritic stainless steels maintained for a long time at temperatures in the range of 270 °C to 400 °C is embrittled like the known 475 °C embrittlement of ferritic stainless steels. Deformation and damage micromechanisms of a material must be known in order to apply the "local approach to fracture" (LAF) methodology. In this work we tes
Materials Research. Publicado em: 2002-06
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7. Local Approach to Fracture of an Aged Duplex Stainless Steel
The local approach to fracture (LAF) is a methodology aimed to calculate macroscopic fracture properties of a body, from the knowledge of the local stress - strain field at the fracture site, and the modeling of the acting fracture mechanisms. In the present work, this method was applied to a CF8M steel, aged 30000h at 325 °C, in order to elucidate if LAF c
Materials Research. Publicado em: 2002-06
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8. Effect of niobium on the microstructure and mechanical properties of cast super duplex stainless steel SEW 410 W. Nr.1.4517 / Efeito do Nióbio na Microestrutura e nas Propriedades Mecânicas do Aço Inoxidável Superduplex Fundido SEW 410 W.Nr. 1.4517
To produce duplex stainless steel in an economic way it is necessary to use scrap and process returns containing high Cr, Ni and Mo contents. This procedure can result in an unexpected alloy chemical composition with some elements not included in the material standard. This work studied the Nb influence on the microstructure and mechanical properties of cast
Publicado em: 2000
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9. Estudo da laminação a quente do aço rapido ABNT M2
In this work, the behaviour of M2 high speed steel during hot rolling, was studied. Both qualitative and quantitative characterization was undertaken of the carbides present before and immediatelyafter true strains sufferedby the material due to hot rolling. For this characterization the techniques of optical and scanning electron microscopy, X-ray diffracti
Publicado em: 1996
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10. Recristalização das ligas supercondutoras do sistema Nb-Ti
Multifilamentary cables of Nb-Ti alloys have been used mainly in superconducting engines and devices. These alloys have high ductility and their final most important superconducting properties can be established by suitable metallurgical procedures. In this work the influence of the microstructural characteristics on the superconducting properties and of the
Publicado em: 1986