Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition

Detalhes bibliográficos
Autor(a) principal: Francisco Evaristo UchÃa Reis
Data de Publicação: 2015
Tipo de documento: Tese
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFC
Texto Completo: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15780
Resumo: Superferritic stainless steels are widely used in heat exchangers and in petrochemical power plant because of their excellent mechanical properties coupled to corrosion resistance in chloride rich environments. In this research new superferritic alloys with high Cr, Mo, and Ni contents were produced for oil industry applications. Therefore, two superferritic stainless steels model alloys were developed, one with 0.07% B addition and another one without this alloying element. The phase diagrams for both materials were carried out by Thermo-Calc computacional program. Microstructure characterization was performed using the following techniques: optical and scanning electron microscopy, energy-dispersive spectroscopy, and Xray diffraction. The mechanical properties were assessed by hardness measurements, Charpy impacts and tensile tests. Corrosion resistance of the model alloys in aqueous solution 0.6 M NaCl was investigated by open circuit potential, potentiodynamic cyclic anodic polarization, and electrochemical impedance spectroscopy. Furthermore, critical pitting temperature was determined. The results showed that the superferritic stainless steel model alloy without B addition achieved better mechanical properties than the one of the two commercial superferritic stainless steels alloys. The corrosion resistance of this alloy was similar to the one of the superaustenitic stainless steels, and superduplex in aqueous solution 0.6 M NaCl. However, there was the formation of eutectoid lamellar constituent like perlite for the superferritic stainless steel model alloy with B addition. This eutectoid constituent was deleterious to mechanical properties, as well as to corrosion resistance for the material developed and studied in this thesis.
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spelling info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisEvaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron additionAvaliaÃÃo das propriedades mecÃnicas e de resistÃncia a corrosÃo em ligas modelo de aÃo inoxidÃvel 25Cr 6Mo 5Ni com e sem adiÃÃo de Boro2015-12-04Hamilton Ferreira Gomes de Abreu33547424704http://lattes.cnpq.br/0873865581940415Pedro de Lima Neto29470293304http://lattes.cnpq.br/2969689646961586Marcelo Josà Gomes da Silva37766937387http://lattes.cnpq.br/5966620282197803Juan Manuel Pardal05842447703http://lattes.cnpq.br/3583921436364162SÃrgio Souto Maior Tavares01255531703http://lattes.cnpq.br/432036714481261663623110353http://lattes.cnpq.br/6809768480267928Francisco Evaristo UchÃa ReisUniversidade Federal do CearÃPrograma de PÃs-GraduaÃÃo em Engenharia e CiÃncia de MateriaisUFCBRSuperferrÃticos Testes mecÃnicos Ensaios eletroquÃmicos CorrosÃo por piteSuperferritic Mechanical tests Electrochemical tests Piting corrosionENGENHARIA DE MATERIAIS E METALURGICASuperferritic stainless steels are widely used in heat exchangers and in petrochemical power plant because of their excellent mechanical properties coupled to corrosion resistance in chloride rich environments. In this research new superferritic alloys with high Cr, Mo, and Ni contents were produced for oil industry applications. Therefore, two superferritic stainless steels model alloys were developed, one with 0.07% B addition and another one without this alloying element. The phase diagrams for both materials were carried out by Thermo-Calc computacional program. Microstructure characterization was performed using the following techniques: optical and scanning electron microscopy, energy-dispersive spectroscopy, and Xray diffraction. The mechanical properties were assessed by hardness measurements, Charpy impacts and tensile tests. Corrosion resistance of the model alloys in aqueous solution 0.6 M NaCl was investigated by open circuit potential, potentiodynamic cyclic anodic polarization, and electrochemical impedance spectroscopy. Furthermore, critical pitting temperature was determined. The results showed that the superferritic stainless steel model alloy without B addition achieved better mechanical properties than the one of the two commercial superferritic stainless steels alloys. The corrosion resistance of this alloy was similar to the one of the superaustenitic stainless steels, and superduplex in aqueous solution 0.6 M NaCl. However, there was the formation of eutectoid lamellar constituent like perlite for the superferritic stainless steel model alloy with B addition. This eutectoid constituent was deleterious to mechanical properties, as well as to corrosion resistance for the material developed and studied in this thesis.Os aÃos inoxidÃveis superferrÃticos sÃo amplamente utilizados em trocadores de calor e em plantas petroquÃmicas, devido a suas excelentes propriedades mecÃnicas associadas à resistÃncia à corrosÃo em ambientes ricos em cloreto. Nesta pesquisa foram produzidas novas ligas superferrÃticas com elevados teores de Cr, Mo e Ni para aplicaÃÃo em plantas petrolÃferas. Portanto, foram desenvolvidas duas ligas modelo de aÃo inoxidÃvel superferrÃtico, uma com 0,07% de B e outra sem adiÃÃo deste elemento de liga. Os diagramas de fases para os materiais foram construÃdos a partir do programa computacional Thermo-Calc. A caracterizaÃÃo microestrutural foi realizada usando as tÃcnicas; microscopia Ãptica, microscopia eletrÃnica de varredura, espectroscopia de energia dispersiva de raios-X e difraÃÃo de raios-X. As propriedades mecÃnicas foram avaliadas por medidas de dureza, ensaios de impacto Charpy e ensaios de traÃÃo. A resistÃncia à corrosÃo das ligas modelo, em soluÃÃo aquosa de 0,6M NaCl, foi avaliada por monitoramento do potencial de circuito aberto, polarizaÃÃo potenciodinÃmica cÃclica e espectroscopia de impedÃncia eletroquÃmica. AlÃm de determinar a temperatura crÃtica de pite. Os resultados obtidos demonstram que, a liga modelo de aÃo inoxidÃvel superferrÃtico sem boro apresentou melhores propriedades mecÃnicas, comparada com duas ligas de aÃo inoxidÃvel superferrÃtico comerciais. A resistÃncia à corrosÃo dessa liga foi similar a um aÃo inoxidÃvel superaustenÃtico e a um aÃo inoxidÃvel superduplex, em soluÃÃo aquosa de 0,6M de NaCl. Entretanto, para a liga modelo com boro, ocorreu a formaÃÃo de um constituinte eutetÃide lamelar semelhante à perlita. Este constituinte eutetÃide à deletÃrio para as propriedades mecÃnicas, assim como, na resistÃncia à corrosÃo do material desenvolvido e estudado nesta tese.Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicohttp://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15780application/pdfinfo:eu-repo/semantics/openAccessporreponame:Biblioteca Digital de Teses e Dissertações da UFCinstname:Universidade Federal do Cearáinstacron:UFC2019-01-21T11:29:01Zmail@mail.com -
dc.title.en.fl_str_mv Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
dc.title.alternative.pt.fl_str_mv AvaliaÃÃo das propriedades mecÃnicas e de resistÃncia a corrosÃo em ligas modelo de aÃo inoxidÃvel 25Cr 6Mo 5Ni com e sem adiÃÃo de Boro
title Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
spellingShingle Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
Francisco Evaristo UchÃa Reis
SuperferrÃticos
Testes mecÃnicos
Ensaios eletroquÃmicos
CorrosÃo por pite
Superferritic
Mechanical tests
Electrochemical tests
Piting corrosion
ENGENHARIA DE MATERIAIS E METALURGICA
title_short Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
title_full Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
title_fullStr Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
title_full_unstemmed Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
title_sort Evaluation of mechanical properties and corrosion resistance in stainless steel model 25Cr 6Mo 5Ni alloy with and without Boron addition
author Francisco Evaristo UchÃa Reis
author_facet Francisco Evaristo UchÃa Reis
author_role author
dc.contributor.advisor1.fl_str_mv Hamilton Ferreira Gomes de Abreu
dc.contributor.advisor1ID.fl_str_mv 33547424704
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/0873865581940415
dc.contributor.advisor-co1.fl_str_mv Pedro de Lima Neto
dc.contributor.advisor-co1ID.fl_str_mv 29470293304
dc.contributor.advisor-co1Lattes.fl_str_mv http://lattes.cnpq.br/2969689646961586
dc.contributor.referee1.fl_str_mv Marcelo Josà Gomes da Silva
dc.contributor.referee1ID.fl_str_mv 37766937387
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/5966620282197803
dc.contributor.referee2.fl_str_mv Juan Manuel Pardal
dc.contributor.referee2ID.fl_str_mv 05842447703
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/3583921436364162
dc.contributor.referee3.fl_str_mv SÃrgio Souto Maior Tavares
dc.contributor.referee3ID.fl_str_mv 01255531703
dc.contributor.referee3Lattes.fl_str_mv http://lattes.cnpq.br/4320367144812616
dc.contributor.authorID.fl_str_mv 63623110353
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/6809768480267928
dc.contributor.author.fl_str_mv Francisco Evaristo UchÃa Reis
contributor_str_mv Hamilton Ferreira Gomes de Abreu
Pedro de Lima Neto
Marcelo Josà Gomes da Silva
Juan Manuel Pardal
SÃrgio Souto Maior Tavares
dc.subject.por.fl_str_mv SuperferrÃticos
Testes mecÃnicos
Ensaios eletroquÃmicos
CorrosÃo por pite
topic SuperferrÃticos
Testes mecÃnicos
Ensaios eletroquÃmicos
CorrosÃo por pite
Superferritic
Mechanical tests
Electrochemical tests
Piting corrosion
ENGENHARIA DE MATERIAIS E METALURGICA
dc.subject.eng.fl_str_mv Superferritic
Mechanical tests
Electrochemical tests
Piting corrosion
dc.subject.cnpq.fl_str_mv ENGENHARIA DE MATERIAIS E METALURGICA
dc.description.sponsorship.fl_txt_mv Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico
dc.description.abstract.por.fl_txt_mv Superferritic stainless steels are widely used in heat exchangers and in petrochemical power plant because of their excellent mechanical properties coupled to corrosion resistance in chloride rich environments. In this research new superferritic alloys with high Cr, Mo, and Ni contents were produced for oil industry applications. Therefore, two superferritic stainless steels model alloys were developed, one with 0.07% B addition and another one without this alloying element. The phase diagrams for both materials were carried out by Thermo-Calc computacional program. Microstructure characterization was performed using the following techniques: optical and scanning electron microscopy, energy-dispersive spectroscopy, and Xray diffraction. The mechanical properties were assessed by hardness measurements, Charpy impacts and tensile tests. Corrosion resistance of the model alloys in aqueous solution 0.6 M NaCl was investigated by open circuit potential, potentiodynamic cyclic anodic polarization, and electrochemical impedance spectroscopy. Furthermore, critical pitting temperature was determined. The results showed that the superferritic stainless steel model alloy without B addition achieved better mechanical properties than the one of the two commercial superferritic stainless steels alloys. The corrosion resistance of this alloy was similar to the one of the superaustenitic stainless steels, and superduplex in aqueous solution 0.6 M NaCl. However, there was the formation of eutectoid lamellar constituent like perlite for the superferritic stainless steel model alloy with B addition. This eutectoid constituent was deleterious to mechanical properties, as well as to corrosion resistance for the material developed and studied in this thesis.
Os aÃos inoxidÃveis superferrÃticos sÃo amplamente utilizados em trocadores de calor e em plantas petroquÃmicas, devido a suas excelentes propriedades mecÃnicas associadas à resistÃncia à corrosÃo em ambientes ricos em cloreto. Nesta pesquisa foram produzidas novas ligas superferrÃticas com elevados teores de Cr, Mo e Ni para aplicaÃÃo em plantas petrolÃferas. Portanto, foram desenvolvidas duas ligas modelo de aÃo inoxidÃvel superferrÃtico, uma com 0,07% de B e outra sem adiÃÃo deste elemento de liga. Os diagramas de fases para os materiais foram construÃdos a partir do programa computacional Thermo-Calc. A caracterizaÃÃo microestrutural foi realizada usando as tÃcnicas; microscopia Ãptica, microscopia eletrÃnica de varredura, espectroscopia de energia dispersiva de raios-X e difraÃÃo de raios-X. As propriedades mecÃnicas foram avaliadas por medidas de dureza, ensaios de impacto Charpy e ensaios de traÃÃo. A resistÃncia à corrosÃo das ligas modelo, em soluÃÃo aquosa de 0,6M NaCl, foi avaliada por monitoramento do potencial de circuito aberto, polarizaÃÃo potenciodinÃmica cÃclica e espectroscopia de impedÃncia eletroquÃmica. AlÃm de determinar a temperatura crÃtica de pite. Os resultados obtidos demonstram que, a liga modelo de aÃo inoxidÃvel superferrÃtico sem boro apresentou melhores propriedades mecÃnicas, comparada com duas ligas de aÃo inoxidÃvel superferrÃtico comerciais. A resistÃncia à corrosÃo dessa liga foi similar a um aÃo inoxidÃvel superaustenÃtico e a um aÃo inoxidÃvel superduplex, em soluÃÃo aquosa de 0,6M de NaCl. Entretanto, para a liga modelo com boro, ocorreu a formaÃÃo de um constituinte eutetÃide lamelar semelhante à perlita. Este constituinte eutetÃide à deletÃrio para as propriedades mecÃnicas, assim como, na resistÃncia à corrosÃo do material desenvolvido e estudado nesta tese.
description Superferritic stainless steels are widely used in heat exchangers and in petrochemical power plant because of their excellent mechanical properties coupled to corrosion resistance in chloride rich environments. In this research new superferritic alloys with high Cr, Mo, and Ni contents were produced for oil industry applications. Therefore, two superferritic stainless steels model alloys were developed, one with 0.07% B addition and another one without this alloying element. The phase diagrams for both materials were carried out by Thermo-Calc computacional program. Microstructure characterization was performed using the following techniques: optical and scanning electron microscopy, energy-dispersive spectroscopy, and Xray diffraction. The mechanical properties were assessed by hardness measurements, Charpy impacts and tensile tests. Corrosion resistance of the model alloys in aqueous solution 0.6 M NaCl was investigated by open circuit potential, potentiodynamic cyclic anodic polarization, and electrochemical impedance spectroscopy. Furthermore, critical pitting temperature was determined. The results showed that the superferritic stainless steel model alloy without B addition achieved better mechanical properties than the one of the two commercial superferritic stainless steels alloys. The corrosion resistance of this alloy was similar to the one of the superaustenitic stainless steels, and superduplex in aqueous solution 0.6 M NaCl. However, there was the formation of eutectoid lamellar constituent like perlite for the superferritic stainless steel model alloy with B addition. This eutectoid constituent was deleterious to mechanical properties, as well as to corrosion resistance for the material developed and studied in this thesis.
publishDate 2015
dc.date.issued.fl_str_mv 2015-12-04
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
status_str publishedVersion
format doctoralThesis
dc.identifier.uri.fl_str_mv http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15780
url http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15780
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
dc.publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.publisher.program.fl_str_mv Programa de PÃs-GraduaÃÃo em Engenharia e CiÃncia de Materiais
dc.publisher.initials.fl_str_mv UFC
dc.publisher.country.fl_str_mv BR
publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações da UFC
instname:Universidade Federal do Ceará
instacron:UFC
reponame_str Biblioteca Digital de Teses e Dissertações da UFC
collection Biblioteca Digital de Teses e Dissertações da UFC
instname_str Universidade Federal do Ceará
instacron_str UFC
institution UFC
repository.name.fl_str_mv -
repository.mail.fl_str_mv mail@mail.com
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