Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/10439 |
Resumo: | The surface treatments of metal alloys allow improving the surface qualities by the deposition of another material or by surface modification, producing coatings. The nitrocarburizing, considered one of the most important thermochemical treatments, involves the simultaneous diffusion of N and C into the surface. Understanding and controlling the formation of the nitrocarburized layer have considerable industrial interest due to the improvements regarding wear, fatigue, and corrosion resistances on the metals and their alloys. In the present work, surface modification by plasma nitrocarburizing was performed in a DIN 100Cr6 steel. The studied process parameters were the treatment temperature (550 and 600°C) and methane concentration in the gas mixture (0, 1.0, 1.5, and 2.0%), whereas the treatment time was fixed in 2h. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analyses, as well as wear resistance and micro-hardness tests were used to characterize the samples. The results show that the modifications on the material surface considerably improve the mechanical properties such as hardness and wear resistance, by the formation of nitrides. The compound layer composition and morphology are quite sensitive to the temperature and chemical composition of the treatment atmosphere. Increasing the CH4 concentration on the gas mixture contributes to the formation of the epsilon-Fe2-3 (C,N) phase, considerably enhancing the wear resistance and microhardness, and the use of high N2 concentration induces the production of a micro-porosity layer. Ferritic nitrocarburizing promotes thinner micro-porosity and compound layers, with predominant epsilon phase, and higher superficial microhardness, and the austenitic nitrocarburizing produces a thicker micro-porosity and compound layers, with predominant epsilon and gama’-Fe4N phases on the compound layer. |
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Fontes, Marcos AlvesNascente, Pedro Augusto de Paulahttp://lattes.cnpq.br/1387043320265189http://lattes.cnpq.br/91599340141672525ca236b0-8749-4b7b-9415-0a44b38b69a92018-09-06T13:43:46Z2018-09-06T13:43:46Z2018-08-10FONTES, Marcos Alves. Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6. 2018. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10439.https://repositorio.ufscar.br/handle/ufscar/10439The surface treatments of metal alloys allow improving the surface qualities by the deposition of another material or by surface modification, producing coatings. The nitrocarburizing, considered one of the most important thermochemical treatments, involves the simultaneous diffusion of N and C into the surface. Understanding and controlling the formation of the nitrocarburized layer have considerable industrial interest due to the improvements regarding wear, fatigue, and corrosion resistances on the metals and their alloys. In the present work, surface modification by plasma nitrocarburizing was performed in a DIN 100Cr6 steel. The studied process parameters were the treatment temperature (550 and 600°C) and methane concentration in the gas mixture (0, 1.0, 1.5, and 2.0%), whereas the treatment time was fixed in 2h. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analyses, as well as wear resistance and micro-hardness tests were used to characterize the samples. The results show that the modifications on the material surface considerably improve the mechanical properties such as hardness and wear resistance, by the formation of nitrides. The compound layer composition and morphology are quite sensitive to the temperature and chemical composition of the treatment atmosphere. Increasing the CH4 concentration on the gas mixture contributes to the formation of the epsilon-Fe2-3 (C,N) phase, considerably enhancing the wear resistance and microhardness, and the use of high N2 concentration induces the production of a micro-porosity layer. Ferritic nitrocarburizing promotes thinner micro-porosity and compound layers, with predominant epsilon phase, and higher superficial microhardness, and the austenitic nitrocarburizing produces a thicker micro-porosity and compound layers, with predominant epsilon and gama’-Fe4N phases on the compound layer.Os tratamentos superficiais de ligas metálicas têm como objetivo melhorar as qualidades das superfícies por meio da deposição de outro material ou por meio da modificação superficial, formando revestimentos. A nitrocarbonetação, considerada um dos tratamentos termoquímicos existentes mais importantes, envolve a difusão simultânea dos elementos nitrogênio e carbono na superfície do componente. O entendimento e o controle da formação da camada nitrocarbonetada apresentam considerável interesse industrial devido às melhorias alcançadas nas resistências ao desgaste, à fadiga e à corrosão dos metais e suas ligas. Neste trabalho, empregou-se o processo de modificação superficial por nitrocarbonetação a plasma, no aço DIN 100Cr6, variando-se a temperatura de tratamento (550 e 600°C) e a concentração de CH4 na mistura gasosa (0, 1, 1,5 e 2%), com tempo de tratamento fixo em 2h. As amostras foram caracterizadas por meios das técnicas de difração de raios X (DRX), microscopia eletrônica de varredura (MEV) e espectroscopia por energia dispersiva (EDS), e quantificadas quanto aos níveis de desgaste e análise de microdureza. Os resultados mostram que as modificações promovidas na superfície do material melhoram consideravelmente as propriedades mecânicas de dureza e resistência ao desgaste, com a formação de nitretos. A morfologia e a constituição da camada composta são bastante sensíveis à temperatura e a composição química da atmosfera de tratamento. O aumento na concentração de CH4 contribui para a formação da fase epsilon-Fe2-3 (C,N), aumentando a resistência ao desgaste e a microdureza, e a utilização de altas concentrações de N2 favorece a formação de uma camada de microporosidade. A nitrocarbonetação ferrítica produz uma camada composta menos espessa, com predominância de fase epsilon, com uma dureza superficial maior, além de uma camada de microporosidade estreita. A nitrocarbonetação austenítica produz, além de uma maior camada de microporosidade, uma camada composta mais espessa constituída pelas fases epsilon e gama’ (Fe4N).Não recebi financiamentoporUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarNitrocarbonetaçãoMicrodesgasteMicrodurezaNitrocarburizingMicro-wearMicrohardnessENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAOInfluência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6Influence of the gas mixture and temperature on the plasma nitrocarburizing process of the DIN 100Cr6 steelinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisOnline6006004f37a9bd-afa3-440f-88bd-0e061ab6c9fcinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARLICENSElicense.txtlicense.txttext/plain; charset=utf-81957https://repositorio.ufscar.br/bitstream/ufscar/10439/3/license.txtae0398b6f8b235e40ad82cba6c50031dMD53ORIGINALFONTES_Marcos_2018.pdfFONTES_Marcos_2018.pdfapplication/pdf9229220https://repositorio.ufscar.br/bitstream/ufscar/10439/4/FONTES_Marcos_2018.pdf8fd82ab21a65260b9a3c4cf79bc232f1MD54TEXTFONTES_Marcos_2018.pdf.txtFONTES_Marcos_2018.pdf.txtExtracted texttext/plain260598https://repositorio.ufscar.br/bitstream/ufscar/10439/5/FONTES_Marcos_2018.pdf.txt62ad5ad8d26d2caf856d551f48d5e64bMD55THUMBNAILFONTES_Marcos_2018.pdf.jpgFONTES_Marcos_2018.pdf.jpgIM Thumbnailimage/jpeg6245https://repositorio.ufscar.br/bitstream/ufscar/10439/6/FONTES_Marcos_2018.pdf.jpg5a97f6f3522e07b25c243d0b7a6eebbcMD56ufscar/104392023-09-18 18:31:16.653oai:repositorio.ufscar.br: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Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:16Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
dc.title.alternative.eng.fl_str_mv |
Influence of the gas mixture and temperature on the plasma nitrocarburizing process of the DIN 100Cr6 steel |
title |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
spellingShingle |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 Fontes, Marcos Alves Nitrocarbonetação Microdesgaste Microdureza Nitrocarburizing Micro-wear Microhardness ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO |
title_short |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
title_full |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
title_fullStr |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
title_full_unstemmed |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
title_sort |
Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6 |
author |
Fontes, Marcos Alves |
author_facet |
Fontes, Marcos Alves |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/9159934014167252 |
dc.contributor.author.fl_str_mv |
Fontes, Marcos Alves |
dc.contributor.advisor1.fl_str_mv |
Nascente, Pedro Augusto de Paula |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/1387043320265189 |
dc.contributor.authorID.fl_str_mv |
5ca236b0-8749-4b7b-9415-0a44b38b69a9 |
contributor_str_mv |
Nascente, Pedro Augusto de Paula |
dc.subject.por.fl_str_mv |
Nitrocarbonetação Microdesgaste Microdureza |
topic |
Nitrocarbonetação Microdesgaste Microdureza Nitrocarburizing Micro-wear Microhardness ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO |
dc.subject.eng.fl_str_mv |
Nitrocarburizing Micro-wear Microhardness |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO |
description |
The surface treatments of metal alloys allow improving the surface qualities by the deposition of another material or by surface modification, producing coatings. The nitrocarburizing, considered one of the most important thermochemical treatments, involves the simultaneous diffusion of N and C into the surface. Understanding and controlling the formation of the nitrocarburized layer have considerable industrial interest due to the improvements regarding wear, fatigue, and corrosion resistances on the metals and their alloys. In the present work, surface modification by plasma nitrocarburizing was performed in a DIN 100Cr6 steel. The studied process parameters were the treatment temperature (550 and 600°C) and methane concentration in the gas mixture (0, 1.0, 1.5, and 2.0%), whereas the treatment time was fixed in 2h. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) analyses, as well as wear resistance and micro-hardness tests were used to characterize the samples. The results show that the modifications on the material surface considerably improve the mechanical properties such as hardness and wear resistance, by the formation of nitrides. The compound layer composition and morphology are quite sensitive to the temperature and chemical composition of the treatment atmosphere. Increasing the CH4 concentration on the gas mixture contributes to the formation of the epsilon-Fe2-3 (C,N) phase, considerably enhancing the wear resistance and microhardness, and the use of high N2 concentration induces the production of a micro-porosity layer. Ferritic nitrocarburizing promotes thinner micro-porosity and compound layers, with predominant epsilon phase, and higher superficial microhardness, and the austenitic nitrocarburizing produces a thicker micro-porosity and compound layers, with predominant epsilon and gama’-Fe4N phases on the compound layer. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-09-06T13:43:46Z |
dc.date.available.fl_str_mv |
2018-09-06T13:43:46Z |
dc.date.issued.fl_str_mv |
2018-08-10 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
FONTES, Marcos Alves. Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6. 2018. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10439. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/10439 |
identifier_str_mv |
FONTES, Marcos Alves. Influência da mistura gasosa e da temperatura no processo de nitrocarbonetação a plasma do aço DIN 100Cr6. 2018. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2018. Disponível em: https://repositorio.ufscar.br/handle/ufscar/10439. |
url |
https://repositorio.ufscar.br/handle/ufscar/10439 |
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por |
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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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