Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/13991 |
Resumo: | In the pursuit for materials with improved performance, multi-principal element alloys (MPEAs) attract the interest of the scientific community, due to their large composition space. Some Cr-Co-Ni alloys stand out with excellent toughness values, among the toughest materials ever made. The notorious mechanical behavior of these alloys is mainly ascribed to the occurrence of twinning-induced plasticity (TWIP) and/or transformation-induced plasticity (TRIP). The present work studied the phase equilibria and mechanical properties of the Cr40Co40Ni20 MPEA, such composition was selected because it is located in a transition region between TWIP alloys and TRIP alloys of the Cr-Co-Ni system. In this work, thermodynamic calculations using the CALPHAD method predicted the formation of a sigma phase, which is often undesirable. Experimentally, the sigma phase could be completely suppressed by kinetic factors, so the alloy presented a matrix with face-centered cubic (FCC) structure, annealing twins, and a second phase: possibly 9R phase and/or cooling-induced hexagonal close-packed (HCP) martensitic phase. These structures with fine morphology provided interface hardening, which contributed to the high intrinsic yield strength (σ0) of 299 MPa, obtained by a Hall-Petch study in tensile tests. The alloy also showed an efficient grain refining strengthening of 667 MPa/µm-0.5 and optimal combinations of mechanical strength and ductility, in addition to high toughness. The explanation for this performance is the high work hardening capacity, mainly ascribed to TRIP and possibly TWIP. In dry-sliding wear tests against alumina pins, the alloy exhibited good wear resistance and a low coefficient of friction (CoF) of 0.12. The present results further evidence the high potential of Cr-Co-Ni alloys, particularly the studied composition, in applications which this set of properties is necessary. |
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Bertoli, GustavoKiminami, Claudio Shyintihttp://lattes.cnpq.br/5443002033733395Coury, Francisco Gilhttp://lattes.cnpq.br/8609825406277730http://lattes.cnpq.br/1228687595087909b5672989-ea2b-4008-aa85-e3d10590a0112021-03-16T20:28:43Z2021-03-16T20:28:43Z2021-02-19BERTOLI, Gustavo. Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20. 2021. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2021. Disponível em: https://repositorio.ufscar.br/handle/ufscar/13991.https://repositorio.ufscar.br/handle/ufscar/13991In the pursuit for materials with improved performance, multi-principal element alloys (MPEAs) attract the interest of the scientific community, due to their large composition space. Some Cr-Co-Ni alloys stand out with excellent toughness values, among the toughest materials ever made. The notorious mechanical behavior of these alloys is mainly ascribed to the occurrence of twinning-induced plasticity (TWIP) and/or transformation-induced plasticity (TRIP). The present work studied the phase equilibria and mechanical properties of the Cr40Co40Ni20 MPEA, such composition was selected because it is located in a transition region between TWIP alloys and TRIP alloys of the Cr-Co-Ni system. In this work, thermodynamic calculations using the CALPHAD method predicted the formation of a sigma phase, which is often undesirable. Experimentally, the sigma phase could be completely suppressed by kinetic factors, so the alloy presented a matrix with face-centered cubic (FCC) structure, annealing twins, and a second phase: possibly 9R phase and/or cooling-induced hexagonal close-packed (HCP) martensitic phase. These structures with fine morphology provided interface hardening, which contributed to the high intrinsic yield strength (σ0) of 299 MPa, obtained by a Hall-Petch study in tensile tests. The alloy also showed an efficient grain refining strengthening of 667 MPa/µm-0.5 and optimal combinations of mechanical strength and ductility, in addition to high toughness. The explanation for this performance is the high work hardening capacity, mainly ascribed to TRIP and possibly TWIP. In dry-sliding wear tests against alumina pins, the alloy exhibited good wear resistance and a low coefficient of friction (CoF) of 0.12. The present results further evidence the high potential of Cr-Co-Ni alloys, particularly the studied composition, in applications which this set of properties is necessary.Na busca por materiais com desempenho aprimorado, as ligas de elemento multiprincipal (LEMPs) despertam o interesse da comunidade científica, devido ao seu vasto campo composicional. Algumas ligas do sistema Cr-Co-Ni se destacam por possuírem excelentes valores de tenacidade, dentre os maiores já reportados para todos os materiais. O notório comportamento mecânico dessas ligas é atribuído, dentre outros fatores, à ocorrência de maclagem induzida por deformação (TWIP) e/ou transformação de fase induzida por deformação (TRIP). A presente dissertação estudou o equilíbrio de fases e as propriedades mecânicas da LEMP Cr40Co40Ni20, tal composição foi selecionada por estar em uma região de transição entre as ligas TWIP e as ligas TRIP do sistema Cr-Co-Ni. Neste trabalho, cálculos termodinâmicos utilizando o método CALPHAD previram a formação de fase sigma, muitas vezes indesejável. Experimentalmente, a fase sigma pôde ser totalmente suprimida por fatores cinéticos, de modo que a liga apresentou uma matriz com estrutura cúbica de faces-centradas (CFC), maclas de recozimento e uma segunda fase: possivelmente fase 9R e/ou fase hexagonal compacta (HCP) martensítica induzida por resfriamento. Essas estruturas de morfologia fina proporcionaram endurecimento por interface, o que contribuiu para a elevada tensão de escoamento intrínseca (σ0) de 299 MPa, obtida por um estudo de Hall-Petch em tração. A liga também apresentou um eficiente fortalecimento por refino de grão de 667 MPa/µm-0,5 e ótimas combinações de resistência mecânica e ductilidade, além de elevada tenacidade. A explicação para tal desempenho é a alta capacidade de encruamento, atribuída principalmente à ocorrência de TRIP e possivelmente TWIP. Em ensaios de desgaste a seco contra pinos de alumina, a liga exibiu boa resistência ao desgaste e baixo coeficiente de atrito de 0,12. Os presentes resultados evidenciam o grande potencial das ligas Cr-Co-Ni, particularmente a composição estudada em aplicações onde esse conjunto de propriedades seja necessário.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)CAPES: 88887.334461/2019-00FAPESP: 2019/00229-4FAPESP: 2013/05987-8porUniversidade 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 de elemento multiprincipalLigas Cr-Co-NiEquilíbrio de fasesTRIP/TWIPPropriedades mecânicasHall-PetchMulti-principal element alloysCr-Co-Ni alloysPhase equilibriaMechanical propertiesENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA FISICAEquilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20Phase equilibria and mechanical properties of Cr40Co40Ni20 multi-principal element alloyinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis6006002105c73f-4677-47de-b45e-1c88b51bf001reponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALGustavo Bertoli - Dissertação.pdfGustavo Bertoli - Dissertação.pdfVersão definitiva da dissertação de mestradoapplication/pdf2941066https://repositorio.ufscar.br/bitstream/ufscar/13991/1/Gustavo%20Bertoli%20-%20Disserta%c3%a7%c3%a3o.pdfb050692bf1475162e1f0f2f2bd126b83MD51BCO carta comprovante autoarquivamento .pdfBCO carta comprovante autoarquivamento .pdfCarta comprovanteapplication/pdf380621https://repositorio.ufscar.br/bitstream/ufscar/13991/2/BCO%20carta%20comprovante%20autoarquivamento%20.pdfa1fae6bba9ff35d64cf23d62b9c6b3baMD52CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8811https://repositorio.ufscar.br/bitstream/ufscar/13991/3/license_rdfe39d27027a6cc9cb039ad269a5db8e34MD53TEXTGustavo Bertoli - Dissertação.pdf.txtGustavo Bertoli - Dissertação.pdf.txtExtracted texttext/plain150532https://repositorio.ufscar.br/bitstream/ufscar/13991/4/Gustavo%20Bertoli%20-%20Disserta%c3%a7%c3%a3o.pdf.txt912101ac91ce20e5980bb64f31f362b3MD54BCO carta comprovante autoarquivamento .pdf.txtBCO carta comprovante autoarquivamento .pdf.txtExtracted texttext/plain1https://repositorio.ufscar.br/bitstream/ufscar/13991/6/BCO%20carta%20comprovante%20autoarquivamento%20.pdf.txt68b329da9893e34099c7d8ad5cb9c940MD56THUMBNAILGustavo Bertoli - Dissertação.pdf.jpgGustavo Bertoli - Dissertação.pdf.jpgIM Thumbnailimage/jpeg6000https://repositorio.ufscar.br/bitstream/ufscar/13991/5/Gustavo%20Bertoli%20-%20Disserta%c3%a7%c3%a3o.pdf.jpga27675e5383313cfea494895b0ed8c51MD55BCO carta comprovante autoarquivamento .pdf.jpgBCO carta comprovante autoarquivamento .pdf.jpgIM Thumbnailimage/jpeg14823https://repositorio.ufscar.br/bitstream/ufscar/13991/7/BCO%20carta%20comprovante%20autoarquivamento%20.pdf.jpg3e8a59a42598580e01fdc6c970c3141cMD57ufscar/139912023-09-18 18:32:07.951oai:repositorio.ufscar.br:ufscar/13991Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:32:07Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
dc.title.alternative.eng.fl_str_mv |
Phase equilibria and mechanical properties of Cr40Co40Ni20 multi-principal element alloy |
title |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
spellingShingle |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 Bertoli, Gustavo Ligas de elemento multiprincipal Ligas Cr-Co-Ni Equilíbrio de fases TRIP/TWIP Propriedades mecânicas Hall-Petch Multi-principal element alloys Cr-Co-Ni alloys Phase equilibria Mechanical properties ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA FISICA |
title_short |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
title_full |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
title_fullStr |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
title_full_unstemmed |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
title_sort |
Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20 |
author |
Bertoli, Gustavo |
author_facet |
Bertoli, Gustavo |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/1228687595087909 |
dc.contributor.author.fl_str_mv |
Bertoli, Gustavo |
dc.contributor.advisor1.fl_str_mv |
Kiminami, Claudio Shyinti |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5443002033733395 |
dc.contributor.advisor-co1.fl_str_mv |
Coury, Francisco Gil |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/8609825406277730 |
dc.contributor.authorID.fl_str_mv |
b5672989-ea2b-4008-aa85-e3d10590a011 |
contributor_str_mv |
Kiminami, Claudio Shyinti Coury, Francisco Gil |
dc.subject.por.fl_str_mv |
Ligas de elemento multiprincipal Ligas Cr-Co-Ni Equilíbrio de fases TRIP/TWIP Propriedades mecânicas |
topic |
Ligas de elemento multiprincipal Ligas Cr-Co-Ni Equilíbrio de fases TRIP/TWIP Propriedades mecânicas Hall-Petch Multi-principal element alloys Cr-Co-Ni alloys Phase equilibria Mechanical properties ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA FISICA |
dc.subject.eng.fl_str_mv |
Hall-Petch Multi-principal element alloys Cr-Co-Ni alloys Phase equilibria Mechanical properties |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA FISICA |
description |
In the pursuit for materials with improved performance, multi-principal element alloys (MPEAs) attract the interest of the scientific community, due to their large composition space. Some Cr-Co-Ni alloys stand out with excellent toughness values, among the toughest materials ever made. The notorious mechanical behavior of these alloys is mainly ascribed to the occurrence of twinning-induced plasticity (TWIP) and/or transformation-induced plasticity (TRIP). The present work studied the phase equilibria and mechanical properties of the Cr40Co40Ni20 MPEA, such composition was selected because it is located in a transition region between TWIP alloys and TRIP alloys of the Cr-Co-Ni system. In this work, thermodynamic calculations using the CALPHAD method predicted the formation of a sigma phase, which is often undesirable. Experimentally, the sigma phase could be completely suppressed by kinetic factors, so the alloy presented a matrix with face-centered cubic (FCC) structure, annealing twins, and a second phase: possibly 9R phase and/or cooling-induced hexagonal close-packed (HCP) martensitic phase. These structures with fine morphology provided interface hardening, which contributed to the high intrinsic yield strength (σ0) of 299 MPa, obtained by a Hall-Petch study in tensile tests. The alloy also showed an efficient grain refining strengthening of 667 MPa/µm-0.5 and optimal combinations of mechanical strength and ductility, in addition to high toughness. The explanation for this performance is the high work hardening capacity, mainly ascribed to TRIP and possibly TWIP. In dry-sliding wear tests against alumina pins, the alloy exhibited good wear resistance and a low coefficient of friction (CoF) of 0.12. The present results further evidence the high potential of Cr-Co-Ni alloys, particularly the studied composition, in applications which this set of properties is necessary. |
publishDate |
2021 |
dc.date.accessioned.fl_str_mv |
2021-03-16T20:28:43Z |
dc.date.available.fl_str_mv |
2021-03-16T20:28:43Z |
dc.date.issued.fl_str_mv |
2021-02-19 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
BERTOLI, Gustavo. Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20. 2021. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2021. Disponível em: https://repositorio.ufscar.br/handle/ufscar/13991. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/13991 |
identifier_str_mv |
BERTOLI, Gustavo. Equilíbrio de fases e propriedades mecânicas da liga de elemento multiprincipal Cr40Co40Ni20. 2021. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2021. Disponível em: https://repositorio.ufscar.br/handle/ufscar/13991. |
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https://repositorio.ufscar.br/handle/ufscar/13991 |
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600 600 |
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2105c73f-4677-47de-b45e-1c88b51bf001 |
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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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