Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFU |
Texto Completo: | https://repositorio.ufu.br/handle/123456789/14663 |
Resumo: | The aim of this work is to evaluate the effect of microstructural parameters (eutectic carbides and matrix hardness) of multi-component ferrous alloys on tribological behavior in sliding wear and micro-abrasive wear. The samples were two series of alloys with variable vanadium (V serie) and molybdenum (M serie) contents and fixed amounts of other elements. Each series includes an alloy free of carbides (matrix alloy) and alloys containing carbides (carbide rich alloys). Heat treatments of quenching and tempering were performed to obtain three different levels of metallic matrix hardness. The wear configuration was ball on plane reciprocating sliding tests. Load, speed and temperature were fixed. The apparent friction coeficient and wear rate were measured. Microabrasion wear test used free ballcratering with silica fine abrasives. The wear mechanisms of the types of tests were characterized by SEM and energy-dispersive X-ray (EDX). Friction was almost invariable with volumetric fraction of carbides and nominal matrix hardness. Increasing matrix hardness in alloys of V and M series was improved their wear resistance. The influence of carbide amount in wear rate was small effect in M serie alloys. In harder of the V series alloys the presence of carbides protected the 650 HV matrix. However the increase of the amount of carbides did not altere the wear rate. The following wear mechanisms occured different intensities on several alloys: pull-out of carbides, abrasion, and formation and break-down of tribochemical layers. In microabrasion, the relationship between microstructural parameters and abrasive wear coefficient was complex and not clear. The removal of matrix material due to abrasion with fine silica particles decreased the mechanical supporting of the carbides, which caused intense fracture and their pull-out. |
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Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentesInfluence of microstructural parameters on the tribological behavior of multicomponent ferrous alloysTribologiaMateriaisLigas ferrosas multicomponentesLaminação (Metalurgia)TribologyMaterialsRollingMulti component ferrous alloysCNPQ::ENGENHARIAS::ENGENHARIA MECANICAThe aim of this work is to evaluate the effect of microstructural parameters (eutectic carbides and matrix hardness) of multi-component ferrous alloys on tribological behavior in sliding wear and micro-abrasive wear. The samples were two series of alloys with variable vanadium (V serie) and molybdenum (M serie) contents and fixed amounts of other elements. Each series includes an alloy free of carbides (matrix alloy) and alloys containing carbides (carbide rich alloys). Heat treatments of quenching and tempering were performed to obtain three different levels of metallic matrix hardness. The wear configuration was ball on plane reciprocating sliding tests. Load, speed and temperature were fixed. The apparent friction coeficient and wear rate were measured. Microabrasion wear test used free ballcratering with silica fine abrasives. The wear mechanisms of the types of tests were characterized by SEM and energy-dispersive X-ray (EDX). Friction was almost invariable with volumetric fraction of carbides and nominal matrix hardness. Increasing matrix hardness in alloys of V and M series was improved their wear resistance. The influence of carbide amount in wear rate was small effect in M serie alloys. In harder of the V series alloys the presence of carbides protected the 650 HV matrix. However the increase of the amount of carbides did not altere the wear rate. The following wear mechanisms occured different intensities on several alloys: pull-out of carbides, abrasion, and formation and break-down of tribochemical layers. In microabrasion, the relationship between microstructural parameters and abrasive wear coefficient was complex and not clear. The removal of matrix material due to abrasion with fine silica particles decreased the mechanical supporting of the carbides, which caused intense fracture and their pull-out.Conselho Nacional de Desenvolvimento Científico e TecnológicoDoutor em Engenharia MecânicaO objetivo deste trabalho foi estudar a influência de parâmetros microestruturais de ligas ferrosas multicomponentes no comportamento tribológico em desgaste oxidativo/deslizamento e microabrasão. As amostras para os ensaios consistiram de duas séries de ligas ferrosas multicomponentes ricas em vanádio e molibdênio e outros elementos de liga com quantidade fixas, livres (liga matriz) ou com presença de carbonetos (mais ricas em elementos de liga). Estas amostras sofreram tratamento térmico de têmpera e revenimento diversos, obtendo-se três níveis de dureza nominal na matriz metálica. Adotou-se o ensaio de desgaste por deslizamento, com configuração mecânica esfera sobre plano, com movimento alternado e sendo fixas a carga aplicada, a velocidade e a temperatura. Realizou-se medições do atrito aparente e da taxa de desgaste. A configuração dos testes de microabrasão foi a esfera livre, utilizando abrasivos finos de sílica. O mecanismo de desgaste obtido nas duas abordagens de testes deste trabalho foi analisado por microscopia eletrônica com auxílio de espectrometria de energia dispersiva de raios-X (EDS). O atrito mostrou-se independente da quantidade de carbonetos eutéticos e da dureza nominal da matriz. O aumento da dureza nominal da matriz nas ligas da família V e M diminuiu a taxa de desgaste. O efeito da quantidade de carbonetos sobre a taxa de desgaste nas ligas foi desprezível, tendo uma pequena influência nas ligas ricas de molibdênio. Nas ligas ricas em vanádio mais duras, a presença dos carbonetos protegeu a matriz metálica. Os mecanismos de desgaste obtidos no deslizamento foram fragmentação e arrancamento de carbonetos, formação e quebra da camada triboquímica, presentes em graus diversos nas diferentes ligas e durezas. No caso da microabrasão, a relação entre os parâmetros microestruturais e o coeficiente de desgaste abrasivo nos ensaios de microabrasão nas ligas ferrosas estudadas neste trabalho é complexa e não muito clara. A remoção de material das matrizes devido à ação abrasiva das partículas de sílica nos ensaios de microabrasão diminuiu a sustentação mecânica dos carbonetos, o que possibilitou a fratura e arrancamento destas microestruturas.Universidade Federal de UberlândiaBRPrograma de Pós-graduação em Engenharia MecânicaEngenhariasUFUMello, José Daniel Biasoli dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783817J1Franco, Sinésio Domingueshttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4786105Z3Sinatora, Amiltonhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787947H7Costa, Henara Lillianhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4721823P9Scandian, Cherliohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4763064Y1Boccalini Júnior, Máriohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780830P7Mendes, João Luiz Teixeira2016-06-22T18:39:18Z2008-05-282016-06-22T18:39:18Z2007-02-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdfMENDES, João Luiz Teixeira. Influence of microstructural parameters on the tribological behavior of multicomponent ferrous alloys. 2007. 163 f. Tese (Doutorado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2007.https://repositorio.ufu.br/handle/123456789/14663porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFUinstname:Universidade Federal de Uberlândia (UFU)instacron:UFU2017-02-10T05:00:14Zoai:repositorio.ufu.br:123456789/14663Repositório InstitucionalONGhttp://repositorio.ufu.br/oai/requestdiinf@dirbi.ufu.bropendoar:2017-02-10T05:00:14Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU)false |
dc.title.none.fl_str_mv |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes Influence of microstructural parameters on the tribological behavior of multicomponent ferrous alloys |
title |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes |
spellingShingle |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes Mendes, João Luiz Teixeira Tribologia Materiais Ligas ferrosas multicomponentes Laminação (Metalurgia) Tribology Materials Rolling Multi component ferrous alloys CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
title_short |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes |
title_full |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes |
title_fullStr |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes |
title_full_unstemmed |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes |
title_sort |
Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes |
author |
Mendes, João Luiz Teixeira |
author_facet |
Mendes, João Luiz Teixeira |
author_role |
author |
dc.contributor.none.fl_str_mv |
Mello, José Daniel Biasoli de http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783817J1 Franco, Sinésio Domingues http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4786105Z3 Sinatora, Amilton http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787947H7 Costa, Henara Lillian http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4721823P9 Scandian, Cherlio http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4763064Y1 Boccalini Júnior, Mário http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780830P7 |
dc.contributor.author.fl_str_mv |
Mendes, João Luiz Teixeira |
dc.subject.por.fl_str_mv |
Tribologia Materiais Ligas ferrosas multicomponentes Laminação (Metalurgia) Tribology Materials Rolling Multi component ferrous alloys CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
topic |
Tribologia Materiais Ligas ferrosas multicomponentes Laminação (Metalurgia) Tribology Materials Rolling Multi component ferrous alloys CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
description |
The aim of this work is to evaluate the effect of microstructural parameters (eutectic carbides and matrix hardness) of multi-component ferrous alloys on tribological behavior in sliding wear and micro-abrasive wear. The samples were two series of alloys with variable vanadium (V serie) and molybdenum (M serie) contents and fixed amounts of other elements. Each series includes an alloy free of carbides (matrix alloy) and alloys containing carbides (carbide rich alloys). Heat treatments of quenching and tempering were performed to obtain three different levels of metallic matrix hardness. The wear configuration was ball on plane reciprocating sliding tests. Load, speed and temperature were fixed. The apparent friction coeficient and wear rate were measured. Microabrasion wear test used free ballcratering with silica fine abrasives. The wear mechanisms of the types of tests were characterized by SEM and energy-dispersive X-ray (EDX). Friction was almost invariable with volumetric fraction of carbides and nominal matrix hardness. Increasing matrix hardness in alloys of V and M series was improved their wear resistance. The influence of carbide amount in wear rate was small effect in M serie alloys. In harder of the V series alloys the presence of carbides protected the 650 HV matrix. However the increase of the amount of carbides did not altere the wear rate. The following wear mechanisms occured different intensities on several alloys: pull-out of carbides, abrasion, and formation and break-down of tribochemical layers. In microabrasion, the relationship between microstructural parameters and abrasive wear coefficient was complex and not clear. The removal of matrix material due to abrasion with fine silica particles decreased the mechanical supporting of the carbides, which caused intense fracture and their pull-out. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-02-16 2008-05-28 2016-06-22T18:39:18Z 2016-06-22T18:39:18Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
MENDES, João Luiz Teixeira. Influence of microstructural parameters on the tribological behavior of multicomponent ferrous alloys. 2007. 163 f. Tese (Doutorado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2007. https://repositorio.ufu.br/handle/123456789/14663 |
identifier_str_mv |
MENDES, João Luiz Teixeira. Influence of microstructural parameters on the tribological behavior of multicomponent ferrous alloys. 2007. 163 f. Tese (Doutorado em Engenharias) - Universidade Federal de Uberlândia, Uberlândia, 2007. |
url |
https://repositorio.ufu.br/handle/123456789/14663 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Uberlândia BR Programa de Pós-graduação em Engenharia Mecânica Engenharias UFU |
publisher.none.fl_str_mv |
Universidade Federal de Uberlândia BR Programa de Pós-graduação em Engenharia Mecânica Engenharias UFU |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFU instname:Universidade Federal de Uberlândia (UFU) instacron:UFU |
instname_str |
Universidade Federal de Uberlândia (UFU) |
instacron_str |
UFU |
institution |
UFU |
reponame_str |
Repositório Institucional da UFU |
collection |
Repositório Institucional da UFU |
repository.name.fl_str_mv |
Repositório Institucional da UFU - Universidade Federal de Uberlândia (UFU) |
repository.mail.fl_str_mv |
diinf@dirbi.ufu.br |
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1805569707114233856 |