Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo
| Autor(a) principal: | |
|---|---|
| Data de Publicação: | 2011 |
| 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=6788 |
Resumo: | Currently the development of ferritic alloys Cr-Mo more resistant to corrosion at high temperatures has been much in demand. An alloy widely used in the petrochemical industry is the 9Cr-1Mo alloy. The objective of this work is to study the effect of molybdenum content in the formation of deleterious phases and corrosion resistance alloys model Fe-Cr-Mo making a comparison with the commercial alloy 9Cr-1Mo. We used a program to determine the thermodynamic solubilization temperatures and banding of deleterious phases at temperatures 450-650 Â C. It was found that the condition solubilized in the model alloys had a ferritic structure. The addition of molybdenum promotes the emergence of intermetallic phases, increasing the presence of the same temperature range. The analysis by different techniques show that the precipitates formed in 9Cr-1Mo alloy are the type M23C6. We observed the formation of a harmful phase rich in molybdenum, the alloys model from the temperature of 450 Â C. The phase found was characterized as the μ phase. The studied alloys tend to form a passivation film, but which are not stable. The 9Cr-1Mo alloy showed the worst corrosion resistance condition in relation to the model alloys. Molybdenum contents of more than 5% by weight, enable increased formation of deleterious phases and does not promote improvements in corrosion resistance. Key words: Molybdenum, potentiodynamic polarization, P9, μ phase |
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info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisInfluence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-MoInfluÃncia do teor de molibdÃnio na resistÃncia à corrosÃo e formaÃÃo de fases em ligas modelo Fe-Cr-Mo 2011-12-08Pedro de Lima Neto29470293304http://lattes.cnpq.br/2969689646961586Hamilton Ferreira Gomes de Abreu33547424704http://lattes.cnpq.br/0873865581940415LÃcia Helena Mascaro07457778802http://lattes.cnpq.br/9130022476352844Marcelo Josà Gomes da Silva37766937387http://lattes.cnpq.br/5966620282197803Artur de Jesus Motheo97988936891http://lattes.cnpq.br/6083354919054179 24349968334http://lattes.cnpq.br/4709942424978744 Luis FlÃvio Gaspar HerculanoUniversidade Federal do CearÃPrograma de PÃs-GraduaÃÃo em Engenharia e CiÃncia de MateriaisUFCBRMolibdÃnio CorrosÃo eletrolÃtica Altas temperaturasCiÃncia dos MateriaisMolybdenum Electrolytic corrosion High temperaturesENGENHARIA DE MATERIAIS E METALURGICACurrently the development of ferritic alloys Cr-Mo more resistant to corrosion at high temperatures has been much in demand. An alloy widely used in the petrochemical industry is the 9Cr-1Mo alloy. The objective of this work is to study the effect of molybdenum content in the formation of deleterious phases and corrosion resistance alloys model Fe-Cr-Mo making a comparison with the commercial alloy 9Cr-1Mo. We used a program to determine the thermodynamic solubilization temperatures and banding of deleterious phases at temperatures 450-650  C. It was found that the condition solubilized in the model alloys had a ferritic structure. The addition of molybdenum promotes the emergence of intermetallic phases, increasing the presence of the same temperature range. The analysis by different techniques show that the precipitates formed in 9Cr-1Mo alloy are the type M23C6. We observed the formation of a harmful phase rich in molybdenum, the alloys model from the temperature of 450  C. The phase found was characterized as the μ phase. The studied alloys tend to form a passivation film, but which are not stable. The 9Cr-1Mo alloy showed the worst corrosion resistance condition in relation to the model alloys. Molybdenum contents of more than 5% by weight, enable increased formation of deleterious phases and does not promote improvements in corrosion resistance. Key words: Molybdenum, potentiodynamic polarization, P9, μ phaseAtualmente o desenvolvimento de ligas ferrÃticas Cr-Mo mais resistentes à corrosÃo em altas temperaturas tem sido muito solicitado. Uma liga muito utilizada na indÃstria petroquÃmica à a liga 9Cr-1Mo. O objetivo deste trabalho à estudar o efeito do teor de molibdÃnio na formaÃÃo de fases deletÃrias e na resistÃncia à corrosÃo em ligas modelo Fe-Cr-Mo fazendo um comparativo com a liga comercial 9Cr-1Mo. Utilizou-se um programa termodinÃmico para determinar as temperaturas de solubilizaÃÃo e as faixas de formaÃÃo das fases deletÃrias nas temperaturas de 450 a 650 ÂC. Constatou-se que na condiÃÃo solubilizada as ligas modelo apresentavam uma estrutura ferrÃtica. A adiÃÃo de molibdÃnio favorece ao surgimento de fases intermetÃlicas, elevando a faixa de temperatura de existÃncia das mesmas. As anÃlises de por diferentes tÃcnicas mostram que a os precipitados formados na liga 9Cr-1Mo sÃo do tipo M23C6. Observou-se a formaÃÃo de uma fase deletÃria, rica em molibdÃnio, nas ligas modelo a partir da temperatura de 450 ÂC. A fase encontrada foi caracterizada como sendo a fase Â. As ligas estudadas tendem a formar um filme de passivaÃÃo, mas que nÃo sÃo estÃveis. A liga 9Cr-1Mo apresentou a pior condiÃÃo de resistÃncia à corrosÃo em relaÃÃo Ãs ligas modelo. Teores de molibdÃnio superiores a 5%, em massa, possibilitam uma maior formaÃÃo de fases deletÃrias e nÃo promove melhorias na resistÃncia a corrosÃo. Palavras chaves: MolibdÃnio, PolarizaÃÃo potenciodinÃmica, P9, fase Â. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6788application/pdfinfo:eu-repo/semantics/openAccessporreponame:Biblioteca Digital de Teses e Dissertações da UFCinstname:Universidade Federal do Cearáinstacron:UFC2019-01-21T11:19:52Zmail@mail.com - |
| dc.title.en.fl_str_mv |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| dc.title.alternative.pt.fl_str_mv |
InfluÃncia do teor de molibdÃnio na resistÃncia à corrosÃo e formaÃÃo de fases em ligas modelo Fe-Cr-Mo |
| title |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| spellingShingle |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo Luis FlÃvio Gaspar Herculano MolibdÃnio CorrosÃo eletrolÃtica Altas temperaturas CiÃncia dos Materiais Molybdenum Electrolytic corrosion High temperatures ENGENHARIA DE MATERIAIS E METALURGICA |
| title_short |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| title_full |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| title_fullStr |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| title_full_unstemmed |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| title_sort |
Influence of molybdenum content on corrosion resistance and phase formation in alloy model Fe-Cr-Mo |
| author |
Luis FlÃvio Gaspar Herculano |
| author_facet |
Luis FlÃvio Gaspar Herculano |
| author_role |
author |
| dc.contributor.advisor1.fl_str_mv |
Pedro de Lima Neto |
| dc.contributor.advisor1ID.fl_str_mv |
29470293304 |
| dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/2969689646961586 |
| dc.contributor.referee1.fl_str_mv |
Hamilton Ferreira Gomes de Abreu |
| dc.contributor.referee1ID.fl_str_mv |
33547424704 |
| dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/0873865581940415 |
| dc.contributor.referee2.fl_str_mv |
LÃcia Helena Mascaro |
| dc.contributor.referee2ID.fl_str_mv |
07457778802 |
| dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/9130022476352844 |
| dc.contributor.referee3.fl_str_mv |
Marcelo Josà Gomes da Silva |
| dc.contributor.referee3ID.fl_str_mv |
37766937387 |
| dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/5966620282197803 |
| dc.contributor.referee4.fl_str_mv |
Artur de Jesus Motheo |
| dc.contributor.referee4ID.fl_str_mv |
97988936891 |
| dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/6083354919054179 |
| dc.contributor.authorID.fl_str_mv |
24349968334 |
| dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4709942424978744 |
| dc.contributor.author.fl_str_mv |
Luis FlÃvio Gaspar Herculano |
| contributor_str_mv |
Pedro de Lima Neto Hamilton Ferreira Gomes de Abreu LÃcia Helena Mascaro Marcelo Josà Gomes da Silva Artur de Jesus Motheo |
| dc.subject.por.fl_str_mv |
MolibdÃnio CorrosÃo eletrolÃtica Altas temperaturas CiÃncia dos Materiais |
| topic |
MolibdÃnio CorrosÃo eletrolÃtica Altas temperaturas CiÃncia dos Materiais Molybdenum Electrolytic corrosion High temperatures ENGENHARIA DE MATERIAIS E METALURGICA |
| dc.subject.eng.fl_str_mv |
Molybdenum Electrolytic corrosion High temperatures |
| dc.subject.cnpq.fl_str_mv |
ENGENHARIA DE MATERIAIS E METALURGICA |
| dc.description.abstract.por.fl_txt_mv |
Currently the development of ferritic alloys Cr-Mo more resistant to corrosion at high temperatures has been much in demand. An alloy widely used in the petrochemical industry is the 9Cr-1Mo alloy. The objective of this work is to study the effect of molybdenum content in the formation of deleterious phases and corrosion resistance alloys model Fe-Cr-Mo making a comparison with the commercial alloy 9Cr-1Mo. We used a program to determine the thermodynamic solubilization temperatures and banding of deleterious phases at temperatures 450-650  C. It was found that the condition solubilized in the model alloys had a ferritic structure. The addition of molybdenum promotes the emergence of intermetallic phases, increasing the presence of the same temperature range. The analysis by different techniques show that the precipitates formed in 9Cr-1Mo alloy are the type M23C6. We observed the formation of a harmful phase rich in molybdenum, the alloys model from the temperature of 450  C. The phase found was characterized as the μ phase. The studied alloys tend to form a passivation film, but which are not stable. The 9Cr-1Mo alloy showed the worst corrosion resistance condition in relation to the model alloys. Molybdenum contents of more than 5% by weight, enable increased formation of deleterious phases and does not promote improvements in corrosion resistance. Key words: Molybdenum, potentiodynamic polarization, P9, μ phase Atualmente o desenvolvimento de ligas ferrÃticas Cr-Mo mais resistentes à corrosÃo em altas temperaturas tem sido muito solicitado. Uma liga muito utilizada na indÃstria petroquÃmica à a liga 9Cr-1Mo. O objetivo deste trabalho à estudar o efeito do teor de molibdÃnio na formaÃÃo de fases deletÃrias e na resistÃncia à corrosÃo em ligas modelo Fe-Cr-Mo fazendo um comparativo com a liga comercial 9Cr-1Mo. Utilizou-se um programa termodinÃmico para determinar as temperaturas de solubilizaÃÃo e as faixas de formaÃÃo das fases deletÃrias nas temperaturas de 450 a 650 ÂC. Constatou-se que na condiÃÃo solubilizada as ligas modelo apresentavam uma estrutura ferrÃtica. A adiÃÃo de molibdÃnio favorece ao surgimento de fases intermetÃlicas, elevando a faixa de temperatura de existÃncia das mesmas. As anÃlises de por diferentes tÃcnicas mostram que a os precipitados formados na liga 9Cr-1Mo sÃo do tipo M23C6. Observou-se a formaÃÃo de uma fase deletÃria, rica em molibdÃnio, nas ligas modelo a partir da temperatura de 450 ÂC. A fase encontrada foi caracterizada como sendo a fase Â. As ligas estudadas tendem a formar um filme de passivaÃÃo, mas que nÃo sÃo estÃveis. A liga 9Cr-1Mo apresentou a pior condiÃÃo de resistÃncia à corrosÃo em relaÃÃo Ãs ligas modelo. Teores de molibdÃnio superiores a 5%, em massa, possibilitam uma maior formaÃÃo de fases deletÃrias e nÃo promove melhorias na resistÃncia a corrosÃo. Palavras chaves: MolibdÃnio, PolarizaÃÃo potenciodinÃmica, P9, fase Â. |
| description |
Currently the development of ferritic alloys Cr-Mo more resistant to corrosion at high temperatures has been much in demand. An alloy widely used in the petrochemical industry is the 9Cr-1Mo alloy. The objective of this work is to study the effect of molybdenum content in the formation of deleterious phases and corrosion resistance alloys model Fe-Cr-Mo making a comparison with the commercial alloy 9Cr-1Mo. We used a program to determine the thermodynamic solubilization temperatures and banding of deleterious phases at temperatures 450-650 Â C. It was found that the condition solubilized in the model alloys had a ferritic structure. The addition of molybdenum promotes the emergence of intermetallic phases, increasing the presence of the same temperature range. The analysis by different techniques show that the precipitates formed in 9Cr-1Mo alloy are the type M23C6. We observed the formation of a harmful phase rich in molybdenum, the alloys model from the temperature of 450 Â C. The phase found was characterized as the μ phase. The studied alloys tend to form a passivation film, but which are not stable. The 9Cr-1Mo alloy showed the worst corrosion resistance condition in relation to the model alloys. Molybdenum contents of more than 5% by weight, enable increased formation of deleterious phases and does not promote improvements in corrosion resistance. Key words: Molybdenum, potentiodynamic polarization, P9, μ phase |
| publishDate |
2011 |
| dc.date.issued.fl_str_mv |
2011-12-08 |
| dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/doctoralThesis |
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publishedVersion |
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doctoralThesis |
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http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6788 |
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http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6788 |
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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 Federal do Cearà |
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Programa de PÃs-GraduaÃÃo em Engenharia e CiÃncia de Materiais |
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UFC |
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BR |
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Universidade Federal do Cearà |
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reponame:Biblioteca Digital de Teses e Dissertações da UFC instname:Universidade Federal do Ceará instacron:UFC |
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