Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) |
Texto Completo: | http://10.0.217.128:8080/jspui/handle/tede/377 |
Resumo: | The ASTM 743 CA6NM steel is widely used in making components for hydraulic turbines, in particular Francis rotors. The welding process, which is used in the manufacture, is of fundamental importance in the structural reliability of the rotors, as well as in their lifetime in operation, since the welded joint must resist to all the mechanical stresses imposed on the rotors during operation. In this context, this survey was outlined through a planned study, in order to evaluate the mechanical performance of four different concepts of welded joints that can be applied in the manufacture of rotors, analyzing the microstructural changes in each study condition and correlating with the results of mechanical tests, as well as with found failure mechanisms. At the end of the work, it is concluded that the heat treatment after welding is indispensable to ensure an adequate mechanical performance of welded joints of ASTM 743 CA6NM steel by GMAW process. It is also concluded that the study condition which has used the ER309L filler metal austenitic in the root pass and the ER410NiMo martensitic action metal in the filling passes, with subsequent heat treatment, has showed the best results in the traction trials and tenacity to the impact. Thus, it is the most suitable for the application in the manufacture of turbine rotors with ASTM 743 CA6NM steel. The presence of δ ferrite with formation in the biphasic region has not affected directly the results in the impact tenacity testing, so it was required a specific study to assess the effect of the proposed conditions. In the fatigue tests, the obtained results show that the quality of the molten material can interfere significantly in the life in fatigue of conditions proposed in this study, because the ruptures occurred preferably in the failure of molten base material. It was also observed that all the samples have reached the number of minimum cycles for the severe working conditions of a Francis rotor. |
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Guimarães, Vagner AlvesCPF:01270541897http://lattes.cnpq.br/2476665230091155CPF:07588944900Ceron, Samuel2018-01-10T18:01:40Z2017-08-292016-09-22CERON, Samuel. Evaluation of the mechanical performance of welded joints of ASTM 743 CA6NM steel used in the manufacture of Francis turbine hydraulic turbine rotors. 2016. 150 f. Dissertação (Mestrado em Engenharia) - Universidade de Passo Fundo, Passo Fundo, 2016.http://10.0.217.128:8080/jspui/handle/tede/377The ASTM 743 CA6NM steel is widely used in making components for hydraulic turbines, in particular Francis rotors. The welding process, which is used in the manufacture, is of fundamental importance in the structural reliability of the rotors, as well as in their lifetime in operation, since the welded joint must resist to all the mechanical stresses imposed on the rotors during operation. In this context, this survey was outlined through a planned study, in order to evaluate the mechanical performance of four different concepts of welded joints that can be applied in the manufacture of rotors, analyzing the microstructural changes in each study condition and correlating with the results of mechanical tests, as well as with found failure mechanisms. At the end of the work, it is concluded that the heat treatment after welding is indispensable to ensure an adequate mechanical performance of welded joints of ASTM 743 CA6NM steel by GMAW process. It is also concluded that the study condition which has used the ER309L filler metal austenitic in the root pass and the ER410NiMo martensitic action metal in the filling passes, with subsequent heat treatment, has showed the best results in the traction trials and tenacity to the impact. Thus, it is the most suitable for the application in the manufacture of turbine rotors with ASTM 743 CA6NM steel. The presence of δ ferrite with formation in the biphasic region has not affected directly the results in the impact tenacity testing, so it was required a specific study to assess the effect of the proposed conditions. In the fatigue tests, the obtained results show that the quality of the molten material can interfere significantly in the life in fatigue of conditions proposed in this study, because the ruptures occurred preferably in the failure of molten base material. It was also observed that all the samples have reached the number of minimum cycles for the severe working conditions of a Francis rotor.O aço ASTM 743 CA6NM é amplamente utilizado na fabricação de componentes para turbinas hidráulicas, em especial os rotores Francis. O processo de soldagem empregado na fabricação tem fundamental importância na confiabilidade estrutural dos rotores, bem como no seu tempo de vida em operação, pois a junta soldada deve resistir a todas às solicitações mecânicas impostas aos rotores durante a operação. Dentro deste contexto, a presente pesquisa foi delineada por meio de um estudo planejado, a fim de avaliar o desempenho mecânico de quatro diferentes concepções de juntas soldadas que podem ser aplicadas na fabricação de rotores, analisando as alterações microestruturais em cada condição de estudo e correlacionando com os resultados dos ensaios mecânicos, bem como os mecanismos de falha encontrados. Ao final do trabalho, conclui-se que o tratamento térmico após a soldagem é fundamental para garantir um adequado desempenho mecânico das juntas soldadas do aço ASTM 743 CA6NM por meio do processo GMAW. Conclui-se, também, que a condição 01 de estudo utilizando o metal de adição austenítico ER309L no passe de raiz e o metal de adição martensítico ER410NiMo nos passes de preenchimento, com posterior tratamento térmico, apresentou os melhores resultados nos ensaios de tração e de tenacidade ao impacto, sendo a mais adequada para a aplicação na fabricação de rotores de turbinas com o aço ASTM 743 CA6NM. A presença de ferrita ¿ com formação na região bifásica não afetou diretamente os resultados nos ensaios de tenacidade ao impacto, sendo necessário um estudo específico para avaliar o efeito desta nas condições propostas. Nos ensaios de fadiga, os resultados obtidos revelam que a qualidade do material fundido pode interferir significativamente na vida em fadiga das condições de estudo propostas neste trabalho, uma vez que as rupturas ocorreram preferencialmente nas falhas do material de base fundido. Também se constatou que todas as amostras atingiram o número de ciclos mínimo para as condições severas de trabalho de um rotor Francis.Made available in DSpace on 2018-01-10T18:01:40Z (GMT). No. of bitstreams: 1 2016SamuelCeron.pdf: 15249100 bytes, checksum: de3089a137c320bcd0b0ebbcaa368516 (MD5) Previous issue date: 2016-09-22application/pdfporUniversidade de Passo FundoPrograma de Pós-Graduação em Projeto e Processos de FabricaçãoUPFBREngenhariaSoldagemAçoTurbinas hidráulicas.WeldingSteelHydraulic turbines.CNPQ::ENGENHARIAS::ENGENHARIA MECANICAAvaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo FrancisEvaluation of the mechanical performance of welded joints of ASTM 743 CA6NM steel used in the manufacture of Francis turbine hydraulic turbine rotorsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF)instname:Universidade de Passo Fundo (UPF)instacron:UPFORIGINAL2016SamuelCeron.pdfapplication/pdf15249100http://tede.upf.br:8080/jspui/bitstream/tede/377/1/2016SamuelCeron.pdfde3089a137c320bcd0b0ebbcaa368516MD51tede/3772018-01-10 16:01:40.458oai:tede.upf.br:tede/377Biblioteca Digital de Teses e DissertaçõesPUBhttp://tede.upf.br/oai/requestbiblio@upf.br || bio@upf.br || cas@upf.br || car@upf.br || lve@upf.br || sar@upf.br || sol@upf.br || upfmundi@upf.br || jucelei@upf.bropendoar:2018-01-10T18:01:40Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) - Universidade de Passo Fundo (UPF)false |
dc.title.por.fl_str_mv |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
dc.title.alternative.eng.fl_str_mv |
Evaluation of the mechanical performance of welded joints of ASTM 743 CA6NM steel used in the manufacture of Francis turbine hydraulic turbine rotors |
title |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
spellingShingle |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis Ceron, Samuel Soldagem Aço Turbinas hidráulicas. Welding Steel Hydraulic turbines. CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
title_short |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
title_full |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
title_fullStr |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
title_full_unstemmed |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
title_sort |
Avaliação do desempenho mecânico de juntas soldadas do aço ASTM 743 CA6NM utilizado na fabricação de rotores de turbinas hidraúlicas tipo Francis |
author |
Ceron, Samuel |
author_facet |
Ceron, Samuel |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Guimarães, Vagner Alves |
dc.contributor.advisor1ID.fl_str_mv |
CPF:01270541897 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/2476665230091155 |
dc.contributor.authorID.fl_str_mv |
CPF:07588944900 |
dc.contributor.author.fl_str_mv |
Ceron, Samuel |
contributor_str_mv |
Guimarães, Vagner Alves |
dc.subject.por.fl_str_mv |
Soldagem Aço Turbinas hidráulicas. |
topic |
Soldagem Aço Turbinas hidráulicas. Welding Steel Hydraulic turbines. CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
dc.subject.eng.fl_str_mv |
Welding Steel Hydraulic turbines. |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA MECANICA |
description |
The ASTM 743 CA6NM steel is widely used in making components for hydraulic turbines, in particular Francis rotors. The welding process, which is used in the manufacture, is of fundamental importance in the structural reliability of the rotors, as well as in their lifetime in operation, since the welded joint must resist to all the mechanical stresses imposed on the rotors during operation. In this context, this survey was outlined through a planned study, in order to evaluate the mechanical performance of four different concepts of welded joints that can be applied in the manufacture of rotors, analyzing the microstructural changes in each study condition and correlating with the results of mechanical tests, as well as with found failure mechanisms. At the end of the work, it is concluded that the heat treatment after welding is indispensable to ensure an adequate mechanical performance of welded joints of ASTM 743 CA6NM steel by GMAW process. It is also concluded that the study condition which has used the ER309L filler metal austenitic in the root pass and the ER410NiMo martensitic action metal in the filling passes, with subsequent heat treatment, has showed the best results in the traction trials and tenacity to the impact. Thus, it is the most suitable for the application in the manufacture of turbine rotors with ASTM 743 CA6NM steel. The presence of δ ferrite with formation in the biphasic region has not affected directly the results in the impact tenacity testing, so it was required a specific study to assess the effect of the proposed conditions. In the fatigue tests, the obtained results show that the quality of the molten material can interfere significantly in the life in fatigue of conditions proposed in this study, because the ruptures occurred preferably in the failure of molten base material. It was also observed that all the samples have reached the number of minimum cycles for the severe working conditions of a Francis rotor. |
publishDate |
2016 |
dc.date.issued.fl_str_mv |
2016-09-22 |
dc.date.available.fl_str_mv |
2017-08-29 |
dc.date.accessioned.fl_str_mv |
2018-01-10T18:01:40Z |
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 |
CERON, Samuel. Evaluation of the mechanical performance of welded joints of ASTM 743 CA6NM steel used in the manufacture of Francis turbine hydraulic turbine rotors. 2016. 150 f. Dissertação (Mestrado em Engenharia) - Universidade de Passo Fundo, Passo Fundo, 2016. |
dc.identifier.uri.fl_str_mv |
http://10.0.217.128:8080/jspui/handle/tede/377 |
identifier_str_mv |
CERON, Samuel. Evaluation of the mechanical performance of welded joints of ASTM 743 CA6NM steel used in the manufacture of Francis turbine hydraulic turbine rotors. 2016. 150 f. Dissertação (Mestrado em Engenharia) - Universidade de Passo Fundo, Passo Fundo, 2016. |
url |
http://10.0.217.128:8080/jspui/handle/tede/377 |
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por |
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por |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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Universidade de Passo Fundo |
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Programa de Pós-Graduação em Projeto e Processos de Fabricação |
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UPF |
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BR |
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Engenharia |
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Universidade de Passo Fundo |
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Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) |
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Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) - Universidade de Passo Fundo (UPF) |
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biblio@upf.br || bio@upf.br || cas@upf.br || car@upf.br || lve@upf.br || sar@upf.br || sol@upf.br || upfmundi@upf.br || jucelei@upf.br |
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