Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/12073 |
Resumo: | The The aim of this work is to study the microstructure and corrosion resistance of rapidly solidified binary Ni-xNb alloys (x= 10, 20, 30, 40, 45, 52 e 57 wt%), additionally the microstructure of the Ni-52Nb alloy, prepared through gas atomization forming process. High-purity elements (99,9 wt% Nb and 99,9 wt% Ni) were used for the pre-alloyed ingots prepared in copper mold by arc melting furnace, and commercial quality materials for the Ni-52Nb alloy by gas atomization process, this alloy was selected owing to their glass forming ability. These Ni-Nb alloys could be employed as coating, deposited by means of remelting laser processes, such as laser cladding. Besides, there is little evidence in literature about their microstructural morphology. Characterization was performed through: Microhardness Vickers test, Potenciodynamic Polarization, X-Ray Diffraction (XRD), Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) together with Energy-Dispersive X-Ray Spectroscopy (EDS), Focused Ion Beam (FIB). Differential Scanning Calorimetry (DSC) was performed for the Ni-20Nb sample in order to confirm the formation Ni8Nb metastable phase. An increase in hardness values were observed with the increasing of Nb content (between 70 HV and 860 HV). Potenciodynamic Polarization curves showed an important increase in passivation values of the alloys with as function of Nb content, improving significantly the pitting corrosion resistance when compare with commercial superalloys as Inconel 625. Alloys solidified in arc melting furnace showed marked variation in their microstructure as function of Nb content. The metastable phase Ni8Nb was identified as showing needle-like morphology, which is not reported in literature appearing in Ni-Nb binary alloys, secondary phases Ni3Nb and Ni6Nb7 were also observed. Atomized powder of Ni-52Nb alloy obtained was sieved in different sizes (between 45 and 250 μm), and amorphization was observed to occurred along the all range of sizes. |
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Martinez Orozco, Katherine JudithAfonso, Conrado Ramos Moreirahttp://lattes.cnpq.br/2176215981291453Della Rovere, Carlos Albertohttp://lattes.cnpq.br/8141224513975606http://lattes.cnpq.br/6301808903391335bafeb7a4-bf23-4dd7-a6b5-2e57597c2fb12019-11-25T13:23:56Z2019-11-25T13:23:56Z2018-02-26MARTINEZ OROZCO, Katherine Judith. Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente. 2018. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/12073.https://repositorio.ufscar.br/handle/ufscar/12073The The aim of this work is to study the microstructure and corrosion resistance of rapidly solidified binary Ni-xNb alloys (x= 10, 20, 30, 40, 45, 52 e 57 wt%), additionally the microstructure of the Ni-52Nb alloy, prepared through gas atomization forming process. High-purity elements (99,9 wt% Nb and 99,9 wt% Ni) were used for the pre-alloyed ingots prepared in copper mold by arc melting furnace, and commercial quality materials for the Ni-52Nb alloy by gas atomization process, this alloy was selected owing to their glass forming ability. These Ni-Nb alloys could be employed as coating, deposited by means of remelting laser processes, such as laser cladding. Besides, there is little evidence in literature about their microstructural morphology. Characterization was performed through: Microhardness Vickers test, Potenciodynamic Polarization, X-Ray Diffraction (XRD), Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) together with Energy-Dispersive X-Ray Spectroscopy (EDS), Focused Ion Beam (FIB). Differential Scanning Calorimetry (DSC) was performed for the Ni-20Nb sample in order to confirm the formation Ni8Nb metastable phase. An increase in hardness values were observed with the increasing of Nb content (between 70 HV and 860 HV). Potenciodynamic Polarization curves showed an important increase in passivation values of the alloys with as function of Nb content, improving significantly the pitting corrosion resistance when compare with commercial superalloys as Inconel 625. Alloys solidified in arc melting furnace showed marked variation in their microstructure as function of Nb content. The metastable phase Ni8Nb was identified as showing needle-like morphology, which is not reported in literature appearing in Ni-Nb binary alloys, secondary phases Ni3Nb and Ni6Nb7 were also observed. Atomized powder of Ni-52Nb alloy obtained was sieved in different sizes (between 45 and 250 μm), and amorphization was observed to occurred along the all range of sizes.Neste trabalho estudo-se a microestrutura e a resistência à corrosão de um conjunto de ligas binárias níquel-nióbio, do tipo Ni-xNb (x= 10, 20, 30, 40, 45, 52 e 57 % em peso) solidificadas rapidamente através de fundição em coquilha de cobre, bem como a microestrutura da liga Ni-52Nb solidificada pelo processo de atomização a gás. As amostras foram fabricadas em forno a arco sob vácuo em atmosfera de gás argônio, utilizando elementos de alta pureza (99,9% Nb e 99,9% Ni). Para o processo de atomização a gás utilizaram-se materiais comerciais, e foi escolhida a liga Ni-52Nb, já que possui habilidade de amorfizar. Estas ligas apresentam potencial para ser utilizadas como recobrimeto por processos de refusão a laser, e na literatura existe uma lacuna a ser explorada sobre a microestrutura das mesmas. O pó atomizado foi peneirado em diferentes faixas granulométricas (tamanho <45 até >250 μm) e se observo amorfização em todas as faixas. As amostras foram caracterizadas por: ensaio de microdureza Vickers, polarização potenciodinâmica, difração de raios-X (DRX), microscopia ótica (MO), microscopia eletrônica de varredura (MEV) e de transmissão (MET) em conjunto com a espectroscopia dispersiva em energia de raios-X (EDS), feixe de íons focalizados (FIB); julgo-se necessária a análise térmica por calorimetria diferencial de varredura (DSC) para a amostra Ni-20Nb, com o intuito de evidenciar a formação do intermetálico Ni8Nb. Observou-se que os valores na dureza aumentaram com a adição de Nb (entre 70 HV até 860 HV). As curvas de polarização potenciodinâmica das amostras versus teor de Nb mostraram rendimento superior de passivação comparadas com às ligas comerciais, como o Inconel 625, do ponto de vista de resistência à corrosão por pite. As ligas fundidas apresentaram variação significativa microestrutural em função do teor de Nb. Foi identificada a fase metaestável Ni8Nb que apresentou morfologia agulhada, não reportada pela literatura para ligas Ni-Nb, bem como observou-se as fases secundárias Ni3Nb e Ni6Nb7.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)CAPES: código de financiamento - 001porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarAttribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessLigas BináriasNióbioSolidificação RápidaPassivaçãoBinary alloysNiobiumRapid solidificationPassivationENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAOEstudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamenteStudy of microstructure and corrosion resistance in binary alloys Ni-Nb rapidly solidifiedinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis60013dc14f5-a2ff-412c-b48e-56a4bda35ecareponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALKatherine Judith Martinez Orozco - Dissertação.pdfKatherine Judith Martinez Orozco - Dissertação.pdfDissertaçã0 de Mestradoapplication/pdf6617779https://repositorio.ufscar.br/bitstream/ufscar/12073/1/Katherine%20Judith%20Martinez%20Orozco%20-%20Disserta%c3%a7%c3%a3o.pdf01bd2145c9bf78b8cb56728548b0f4e2MD51BCO carta comprovante autoarquivamento.pdfBCO carta comprovante autoarquivamento.pdfapplication/pdf342303https://repositorio.ufscar.br/bitstream/ufscar/12073/2/BCO%20carta%20comprovante%20autoarquivamento.pdfb6de07b7dd57c0fecf5f33ac8b5ddb98MD52CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8811https://repositorio.ufscar.br/bitstream/ufscar/12073/3/license_rdfe39d27027a6cc9cb039ad269a5db8e34MD53TEXTKatherine Judith Martinez Orozco - Dissertação.pdf.txtKatherine Judith Martinez Orozco - Dissertação.pdf.txtExtracted texttext/plain130256https://repositorio.ufscar.br/bitstream/ufscar/12073/4/Katherine%20Judith%20Martinez%20Orozco%20-%20Disserta%c3%a7%c3%a3o.pdf.txtce560fc30ab7fa0b50232db2989832f8MD54BCO carta comprovante autoarquivamento.pdf.txtBCO carta comprovante autoarquivamento.pdf.txtExtracted texttext/plain1514https://repositorio.ufscar.br/bitstream/ufscar/12073/6/BCO%20carta%20comprovante%20autoarquivamento.pdf.txt9b6bb77af369f94dacf4e0ac99fe5eb3MD56THUMBNAILKatherine Judith Martinez Orozco - Dissertação.pdf.jpgKatherine Judith Martinez Orozco - Dissertação.pdf.jpgIM Thumbnailimage/jpeg6351https://repositorio.ufscar.br/bitstream/ufscar/12073/5/Katherine%20Judith%20Martinez%20Orozco%20-%20Disserta%c3%a7%c3%a3o.pdf.jpgc5daf0e6b3db6d5add9310c09bc09d85MD55BCO carta comprovante autoarquivamento.pdf.jpgBCO carta comprovante autoarquivamento.pdf.jpgIM Thumbnailimage/jpeg13560https://repositorio.ufscar.br/bitstream/ufscar/12073/7/BCO%20carta%20comprovante%20autoarquivamento.pdf.jpga1807b1e0cee8dec683b90ce5ff3d80eMD57ufscar/120732023-09-18 18:31:46.357oai:repositorio.ufscar.br:ufscar/12073Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:46Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
dc.title.alternative.eng.fl_str_mv |
Study of microstructure and corrosion resistance in binary alloys Ni-Nb rapidly solidified |
title |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
spellingShingle |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente Martinez Orozco, Katherine Judith Ligas Binárias Nióbio Solidificação Rápida Passivação Binary alloys Niobium Rapid solidification Passivation ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO |
title_short |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
title_full |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
title_fullStr |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
title_full_unstemmed |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
title_sort |
Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente |
author |
Martinez Orozco, Katherine Judith |
author_facet |
Martinez Orozco, Katherine Judith |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/6301808903391335 |
dc.contributor.author.fl_str_mv |
Martinez Orozco, Katherine Judith |
dc.contributor.advisor1.fl_str_mv |
Afonso, Conrado Ramos Moreira |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/2176215981291453 |
dc.contributor.advisor-co1.fl_str_mv |
Della Rovere, Carlos Alberto |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/8141224513975606 |
dc.contributor.authorID.fl_str_mv |
bafeb7a4-bf23-4dd7-a6b5-2e57597c2fb1 |
contributor_str_mv |
Afonso, Conrado Ramos Moreira Della Rovere, Carlos Alberto |
dc.subject.por.fl_str_mv |
Ligas Binárias Nióbio Solidificação Rápida Passivação |
topic |
Ligas Binárias Nióbio Solidificação Rápida Passivação Binary alloys Niobium Rapid solidification Passivation ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO |
dc.subject.eng.fl_str_mv |
Binary alloys Niobium Rapid solidification Passivation |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO |
description |
The The aim of this work is to study the microstructure and corrosion resistance of rapidly solidified binary Ni-xNb alloys (x= 10, 20, 30, 40, 45, 52 e 57 wt%), additionally the microstructure of the Ni-52Nb alloy, prepared through gas atomization forming process. High-purity elements (99,9 wt% Nb and 99,9 wt% Ni) were used for the pre-alloyed ingots prepared in copper mold by arc melting furnace, and commercial quality materials for the Ni-52Nb alloy by gas atomization process, this alloy was selected owing to their glass forming ability. These Ni-Nb alloys could be employed as coating, deposited by means of remelting laser processes, such as laser cladding. Besides, there is little evidence in literature about their microstructural morphology. Characterization was performed through: Microhardness Vickers test, Potenciodynamic Polarization, X-Ray Diffraction (XRD), Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) together with Energy-Dispersive X-Ray Spectroscopy (EDS), Focused Ion Beam (FIB). Differential Scanning Calorimetry (DSC) was performed for the Ni-20Nb sample in order to confirm the formation Ni8Nb metastable phase. An increase in hardness values were observed with the increasing of Nb content (between 70 HV and 860 HV). Potenciodynamic Polarization curves showed an important increase in passivation values of the alloys with as function of Nb content, improving significantly the pitting corrosion resistance when compare with commercial superalloys as Inconel 625. Alloys solidified in arc melting furnace showed marked variation in their microstructure as function of Nb content. The metastable phase Ni8Nb was identified as showing needle-like morphology, which is not reported in literature appearing in Ni-Nb binary alloys, secondary phases Ni3Nb and Ni6Nb7 were also observed. Atomized powder of Ni-52Nb alloy obtained was sieved in different sizes (between 45 and 250 μm), and amorphization was observed to occurred along the all range of sizes. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-02-26 |
dc.date.accessioned.fl_str_mv |
2019-11-25T13:23:56Z |
dc.date.available.fl_str_mv |
2019-11-25T13:23:56Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MARTINEZ OROZCO, Katherine Judith. Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente. 2018. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/12073. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/12073 |
identifier_str_mv |
MARTINEZ OROZCO, Katherine Judith. Estudo da microestrutura e resistência à corrosão de ligas binárias Ni-Nb solidificadas rapidamente. 2018. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/12073. |
url |
https://repositorio.ufscar.br/handle/ufscar/12073 |
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por |
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600 |
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13dc14f5-a2ff-412c-b48e-56a4bda35eca |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
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openAccess |
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Universidade Federal de São Carlos Câmpus São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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