Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex
Autor(a) principal: | |
---|---|
Data de Publicação: | 2015 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/7273 |
Resumo: | The corrosion resistance and mechanical properties of hardness and toughness of a welded joint multipass duplex stainless steel have been evaluated under the condition with post-weld heat treatment and as-welded. The microstructure along the weld varied as a function of the thermal cycles of the welding process. The heat affected zone (HAZ) showed a higher amount of ferrite and larger grain size. The weld metal (WM) showed more refined microstructure, given by the metal composition of addition used. The parent metal (PM) has not microstructural changes to be far to the fusion zone. The results obtained in electrochemical tests, immersion and mechanical showed that the HAZ presented the pitting potential less noble and higher degree of sensitization in relation to WM and PM. The higher hardness and lower toughness were observed in WM due to the refined microstructure. It was also observed that the post-weld heat treatment reduced the hardness and increased toughness over the joint, reducing the difference of values of these mechanical properties between different regions of the weld. In the corrosion resistance, the effect of the heat treatment was observed in the reduction of the degree of sensitization of the HAZ, it is not significant in pitting potential. The highest rate of corrosion in the welded joint was obtained in the condition as-welded, and observed an attack in the HAZ region. Considering the degree of sensitization and the rate of corrosion of the HAZ, we investigated the presence of precipitates in the region by means of scanning electron microscopy (SEM) and transmission (TEM) with a qualitative chemical analysis and semi-quantitative for energy dispersive X - ray (EDS). The results showed the presence of chi phase, sigma and secondary austenite responsible for the sensitization of the joint as-welded. |
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Higa, Silvia MidoriKuri, Sebastião Eliashttp://lattes.cnpq.br/6842072916153866Sordi, Vitor Luizhttp://lattes.cnpq.br/8364164402481940http://lattes.cnpq.br/72452982854014563c634878-44d8-4099-92b6-9c2ede54cb182016-09-20T17:58:22Z2016-09-20T17:58:22Z2015-12-16HIGA, Silvia Midori. Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex. 2015. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2015. Disponível em: https://repositorio.ufscar.br/handle/ufscar/7273.https://repositorio.ufscar.br/handle/ufscar/7273The corrosion resistance and mechanical properties of hardness and toughness of a welded joint multipass duplex stainless steel have been evaluated under the condition with post-weld heat treatment and as-welded. The microstructure along the weld varied as a function of the thermal cycles of the welding process. The heat affected zone (HAZ) showed a higher amount of ferrite and larger grain size. The weld metal (WM) showed more refined microstructure, given by the metal composition of addition used. The parent metal (PM) has not microstructural changes to be far to the fusion zone. The results obtained in electrochemical tests, immersion and mechanical showed that the HAZ presented the pitting potential less noble and higher degree of sensitization in relation to WM and PM. The higher hardness and lower toughness were observed in WM due to the refined microstructure. It was also observed that the post-weld heat treatment reduced the hardness and increased toughness over the joint, reducing the difference of values of these mechanical properties between different regions of the weld. In the corrosion resistance, the effect of the heat treatment was observed in the reduction of the degree of sensitization of the HAZ, it is not significant in pitting potential. The highest rate of corrosion in the welded joint was obtained in the condition as-welded, and observed an attack in the HAZ region. Considering the degree of sensitization and the rate of corrosion of the HAZ, we investigated the presence of precipitates in the region by means of scanning electron microscopy (SEM) and transmission (TEM) with a qualitative chemical analysis and semi-quantitative for energy dispersive X - ray (EDS). The results showed the presence of chi phase, sigma and secondary austenite responsible for the sensitization of the joint as-welded.A resistência à corrosão e as propriedades mecânicas de dureza e de tenacidade de uma junta soldada multipasses de aço inoxidável duplex foram avaliadas na condição sem e com tratamento térmico pós-soldagem. A microestrutura ao longo da junta soldada variou em função dos ciclos térmicos do processo de soldagem. A zona termicamente afetada (ZTA) apresentou maior quantidade de ferrita e maior tamanho de grão. O metal de solda (MS) apresentou microestrutura mais refinada, dada pela composição do metal de adição utilizado. O metal de base (MB) não sofreu alterações microestruturais por estar distante à zona de fusão. Os resultados obtidos nos ensaios eletroquímicos, de imersão e mecânicos mostraram que a ZTA apresentou o potencial de pites menos nobre e maior grau de sensitização em relação ao MB e ao MS. A maior dureza e menor tenacidade foram observadas no MS em função da microestrutura refinada. Observou-se também que o tratamento térmico pós-soldagem reduziu a dureza e aumentou a tenacidade ao longo da junta, reduzindo a diferença dos valores dessas propriedades mecânicas entre as diferentes regiões da junta soldada. Na resistência à corrosão, o efeito do tratamento térmico foi observado na redução do grau de sensitização da ZTA, não sendo significativo no potencial de pites. A maior taxa de corrosão foi obtida na junta soldada sem tratamento térmico pós-soldagem, sendo observado um ataque na região da ZTA. Considerando o grau de sensitização e a taxa de corrosão da ZTA, investigou-se a presença de precipitados nessa região, por meio de microscopia eletrônica de varredura (MEV) e de transmissão (MET), com análise química qualitativa e semi-quantitativa por energia dispersiva de raios – X (EDX). Os resultados mostraram a presença da fase chi, sigma e austenita secundária, responsáveis pela sensitização da junta sem tratamento térmico pós-soldagem.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarCorrosão localizadaDuplexTenacidadeDurezaSoldaENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAENGENHARIASAvaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplexEvaluation of the corrosion resistance and the mechanical properties in duplex stainless steel jointinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisOnline600600dd65b32b-27ea-44dd-9f6f-c8b3b548e9bainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALTeseSMH.pdfTeseSMH.pdfapplication/pdf4755044https://repositorio.ufscar.br/bitstream/ufscar/7273/1/TeseSMH.pdf3c6412cd47f4445b6a4040b82210ea48MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81957https://repositorio.ufscar.br/bitstream/ufscar/7273/2/license.txtae0398b6f8b235e40ad82cba6c50031dMD52TEXTTeseSMH.pdf.txtTeseSMH.pdf.txtExtracted texttext/plain147482https://repositorio.ufscar.br/bitstream/ufscar/7273/3/TeseSMH.pdf.txt3c511b312ef5896dd2150771c800e014MD53THUMBNAILTeseSMH.pdf.jpgTeseSMH.pdf.jpgIM Thumbnailimage/jpeg6150https://repositorio.ufscar.br/bitstream/ufscar/7273/4/TeseSMH.pdf.jpg3623f0417d657b7d6f8798c5a3f4c060MD54ufscar/72732023-09-18 18:30:47.911oai:repositorio.ufscar.br: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Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:30:47Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
dc.title.alternative.eng.fl_str_mv |
Evaluation of the corrosion resistance and the mechanical properties in duplex stainless steel joint |
title |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
spellingShingle |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex Higa, Silvia Midori Corrosão localizada Duplex Tenacidade Dureza Solda ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA ENGENHARIAS |
title_short |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
title_full |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
title_fullStr |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
title_full_unstemmed |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
title_sort |
Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex |
author |
Higa, Silvia Midori |
author_facet |
Higa, Silvia Midori |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/7245298285401456 |
dc.contributor.author.fl_str_mv |
Higa, Silvia Midori |
dc.contributor.advisor1.fl_str_mv |
Kuri, Sebastião Elias |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/6842072916153866 |
dc.contributor.advisor-co1.fl_str_mv |
Sordi, Vitor Luiz |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/8364164402481940 |
dc.contributor.authorID.fl_str_mv |
3c634878-44d8-4099-92b6-9c2ede54cb18 |
contributor_str_mv |
Kuri, Sebastião Elias Sordi, Vitor Luiz |
dc.subject.por.fl_str_mv |
Corrosão localizada Duplex Tenacidade Dureza Solda |
topic |
Corrosão localizada Duplex Tenacidade Dureza Solda ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA ENGENHARIAS |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA ENGENHARIAS |
description |
The corrosion resistance and mechanical properties of hardness and toughness of a welded joint multipass duplex stainless steel have been evaluated under the condition with post-weld heat treatment and as-welded. The microstructure along the weld varied as a function of the thermal cycles of the welding process. The heat affected zone (HAZ) showed a higher amount of ferrite and larger grain size. The weld metal (WM) showed more refined microstructure, given by the metal composition of addition used. The parent metal (PM) has not microstructural changes to be far to the fusion zone. The results obtained in electrochemical tests, immersion and mechanical showed that the HAZ presented the pitting potential less noble and higher degree of sensitization in relation to WM and PM. The higher hardness and lower toughness were observed in WM due to the refined microstructure. It was also observed that the post-weld heat treatment reduced the hardness and increased toughness over the joint, reducing the difference of values of these mechanical properties between different regions of the weld. In the corrosion resistance, the effect of the heat treatment was observed in the reduction of the degree of sensitization of the HAZ, it is not significant in pitting potential. The highest rate of corrosion in the welded joint was obtained in the condition as-welded, and observed an attack in the HAZ region. Considering the degree of sensitization and the rate of corrosion of the HAZ, we investigated the presence of precipitates in the region by means of scanning electron microscopy (SEM) and transmission (TEM) with a qualitative chemical analysis and semi-quantitative for energy dispersive X - ray (EDS). The results showed the presence of chi phase, sigma and secondary austenite responsible for the sensitization of the joint as-welded. |
publishDate |
2015 |
dc.date.issued.fl_str_mv |
2015-12-16 |
dc.date.accessioned.fl_str_mv |
2016-09-20T17:58:22Z |
dc.date.available.fl_str_mv |
2016-09-20T17:58:22Z |
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.citation.fl_str_mv |
HIGA, Silvia Midori. Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex. 2015. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2015. Disponível em: https://repositorio.ufscar.br/handle/ufscar/7273. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/7273 |
identifier_str_mv |
HIGA, Silvia Midori. Avaliação da resistência à corrosão e das propriedades mecânicas da junta soldada de aço inoxidável duplex. 2015. Tese (Doutorado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2015. Disponível em: https://repositorio.ufscar.br/handle/ufscar/7273. |
url |
https://repositorio.ufscar.br/handle/ufscar/7273 |
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por |
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openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de São Carlos Câmpus São Carlos |
dc.publisher.program.fl_str_mv |
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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