Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/925 |
Resumo: | The contact between drill pipes during oil well exploitations induces a severe wear process that might cause well bore pipe wall rupture, fluids leakage, environmental impacts, and possibly fatal accidents. The problem is known by the oil and gas industries since the 1930 s and several solutions have been proposed by researchers and engineers in order to mitigate its deleterious effects. A method that grows popular in the industrial media is the execution of large-scale tests that consists in forcing a cylinder against the inner wall of a pipe. During this test, in order to reproduce operations conditions, the use of drilling mud as a lubricant and a wear resistant coating over the cylinder are both possible. The purpose of this work was to evaluate the effect of boron addition on the microstructure of spray-formed AISI 430 stainless steel as well as in its wear resistance in a condition comparable to the one observed during drill pipes contact. It was then necessary to develop a wear tester capable of reproducing the changes in the contact areathat occurs during the aforementioned contact. The results showed that unlike the conventional API 5L X80 steel, the spray-formed material s wear rates were constant as predicted by Archard s wear law. Despite the different wear rate behaviors, the generated wear debris showed a similar morphology in all tested materials. The tribossystem conditions induced a plastic ratchetting wear mechanism. In the light of Greenwood and Williamson s theoretical model, it was concluded that the observed changes in the wear rate on conventional steels was due to slow changes in the plasticity index which happens much more quickly in the sprayformed steels due to the presence of intermetallic borides. Moreover, considering the established test parameters, the increase in the boron content also increases the AISI 430 steel s wear resistance, since the increase in the area fraction of intermetallics decreases the rate at which metallic asperities contact each other during the test. |
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Nascimento, Alexandre Romão CostaBolfarini, Claudemirohttp://lattes.cnpq.br/9231627080617037http://lattes.cnpq.br/7480615370794070df72050c-49c9-481d-82ed-4ee7dccbc1182016-06-02T19:12:37Z2014-09-082016-06-02T19:12:37Z2014-08-04NASCIMENTO, Alexandre Romão Costa. effect of boron addition on the microstructure and wear resistance of a spray-formed AISI 430 stainless steel. 2014. 103 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2014.https://repositorio.ufscar.br/handle/ufscar/925The contact between drill pipes during oil well exploitations induces a severe wear process that might cause well bore pipe wall rupture, fluids leakage, environmental impacts, and possibly fatal accidents. The problem is known by the oil and gas industries since the 1930 s and several solutions have been proposed by researchers and engineers in order to mitigate its deleterious effects. A method that grows popular in the industrial media is the execution of large-scale tests that consists in forcing a cylinder against the inner wall of a pipe. During this test, in order to reproduce operations conditions, the use of drilling mud as a lubricant and a wear resistant coating over the cylinder are both possible. The purpose of this work was to evaluate the effect of boron addition on the microstructure of spray-formed AISI 430 stainless steel as well as in its wear resistance in a condition comparable to the one observed during drill pipes contact. It was then necessary to develop a wear tester capable of reproducing the changes in the contact areathat occurs during the aforementioned contact. The results showed that unlike the conventional API 5L X80 steel, the spray-formed material s wear rates were constant as predicted by Archard s wear law. Despite the different wear rate behaviors, the generated wear debris showed a similar morphology in all tested materials. The tribossystem conditions induced a plastic ratchetting wear mechanism. In the light of Greenwood and Williamson s theoretical model, it was concluded that the observed changes in the wear rate on conventional steels was due to slow changes in the plasticity index which happens much more quickly in the sprayformed steels due to the presence of intermetallic borides. Moreover, considering the established test parameters, the increase in the boron content also increases the AISI 430 steel s wear resistance, since the increase in the area fraction of intermetallics decreases the rate at which metallic asperities contact each other during the test.O contato entre os tubos utilizados para a perfuração de poços de petróleo provoca um severo processo de desgaste capaz de causar a ruptura das paredes dos tubos, vazamento de fluidos, impactos ambientais e até mesmo acidentes fatais. O problema é conhecido pela indústria de óleo e gás desde a década de 30 e diversas soluções tem sido propostas por engenheiros e pesquisadores com o intuito de mitigar seus efeitos. Um método que tem se mostrado popular no meio industrial é a realização de ensaios de grande escala que consistem no contato forçado de um cilindro contra a parede interna de um tubo, podendo-se fazer uso de revestimentos resistentes ou lamas de perfuração como lubrificantes, a fim de melhor reproduzir as condições durante a perfuração dos poços. O propósito desta dissertação foi avaliar o efeito da adição de boro na microestrutura do aço inoxidável AISI 430 conformado por spray bem como em sua resistência ao desgaste em um sistema similar ao observado nos equipamentos da coluna de perfuração. Para tanto, foi necessário desenvolver um equipamento de ensaios de escala laboratorial capaz de reproduzir as condições de progressivas mudanças da área de contato entre os tubos de perfuração e as paredes dos tubos dos poços.Observou-se que, diferentemente de aços convencionalmente usados nas tubulações de poços como o API 5L X80, as taxas de desgaste dos aços conformados por spray mostraram-se constantes, conforme previsto pela Lei de Archard. Mesmo assim, os detritos formados durante o ensaio de todos os materiais apresentaram morfologias semelhantes. Recorrendo-se ao clássico modelo de contato entre superfícies desenvolvido por Grenwood e Williamson, concluiu-se que as taxas de desgaste decrescentes observadas nos aços convencionais se devem a uma lenta mudança do índice de plasticidade que, no caso dos aços contendo boretos, se dá de maneira muito mais rápida. Assim, o aumento da porcentagem de boro melhorou, nas condições de ensaio estabelecidas, a resistência ao desgaste do aço inoxidável já que, por aumentar a fração da área de contato que corresponde aos intermetálicos do tipo M2B, diminuiu-se a frequência com que ocorre o contato plástico entre as asperezas metálicas.Universidade Federal de Sao Carlosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRAço inoxidávelResistência ao desgasteTubos de perfuraçãoConformação por sprayENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAEfeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por sprayeffect of boron addition on the microstructure and wear resistance of a spray-formed AISI 430 stainless steelinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-1ea2697dd-8d22-4c7a-8bdd-487c739e04c7info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL6127.pdfapplication/pdf4996115https://repositorio.ufscar.br/bitstream/ufscar/925/1/6127.pdfd851ab96fa45f0bde5c7c504dd376e2fMD51TEXT6127.pdf.txt6127.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/925/2/6127.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL6127.pdf.jpg6127.pdf.jpgIM Thumbnailimage/jpeg6645https://repositorio.ufscar.br/bitstream/ufscar/925/3/6127.pdf.jpg98bcd5b30f435ee4232a1d14dad09b4cMD53ufscar/9252023-09-18 18:31:28.409oai:repositorio.ufscar.br:ufscar/925Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:28Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
dc.title.alternative.eng.fl_str_mv |
effect of boron addition on the microstructure and wear resistance of a spray-formed AISI 430 stainless steel |
title |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
spellingShingle |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray Nascimento, Alexandre Romão Costa Aço inoxidável Resistência ao desgaste Tubos de perfuração Conformação por spray ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
title_full |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
title_fullStr |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
title_full_unstemmed |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
title_sort |
Efeito da adição de boro na microestrutura e na resistência ao desgaste do aço inoxidável AISI 430 conformado por spray |
author |
Nascimento, Alexandre Romão Costa |
author_facet |
Nascimento, Alexandre Romão Costa |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/7480615370794070 |
dc.contributor.author.fl_str_mv |
Nascimento, Alexandre Romão Costa |
dc.contributor.advisor1.fl_str_mv |
Bolfarini, Claudemiro |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9231627080617037 |
dc.contributor.authorID.fl_str_mv |
df72050c-49c9-481d-82ed-4ee7dccbc118 |
contributor_str_mv |
Bolfarini, Claudemiro |
dc.subject.por.fl_str_mv |
Aço inoxidável Resistência ao desgaste Tubos de perfuração Conformação por spray |
topic |
Aço inoxidável Resistência ao desgaste Tubos de perfuração Conformação por spray ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
The contact between drill pipes during oil well exploitations induces a severe wear process that might cause well bore pipe wall rupture, fluids leakage, environmental impacts, and possibly fatal accidents. The problem is known by the oil and gas industries since the 1930 s and several solutions have been proposed by researchers and engineers in order to mitigate its deleterious effects. A method that grows popular in the industrial media is the execution of large-scale tests that consists in forcing a cylinder against the inner wall of a pipe. During this test, in order to reproduce operations conditions, the use of drilling mud as a lubricant and a wear resistant coating over the cylinder are both possible. The purpose of this work was to evaluate the effect of boron addition on the microstructure of spray-formed AISI 430 stainless steel as well as in its wear resistance in a condition comparable to the one observed during drill pipes contact. It was then necessary to develop a wear tester capable of reproducing the changes in the contact areathat occurs during the aforementioned contact. The results showed that unlike the conventional API 5L X80 steel, the spray-formed material s wear rates were constant as predicted by Archard s wear law. Despite the different wear rate behaviors, the generated wear debris showed a similar morphology in all tested materials. The tribossystem conditions induced a plastic ratchetting wear mechanism. In the light of Greenwood and Williamson s theoretical model, it was concluded that the observed changes in the wear rate on conventional steels was due to slow changes in the plasticity index which happens much more quickly in the sprayformed steels due to the presence of intermetallic borides. Moreover, considering the established test parameters, the increase in the boron content also increases the AISI 430 steel s wear resistance, since the increase in the area fraction of intermetallics decreases the rate at which metallic asperities contact each other during the test. |
publishDate |
2014 |
dc.date.available.fl_str_mv |
2014-09-08 2016-06-02T19:12:37Z |
dc.date.issued.fl_str_mv |
2014-08-04 |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:12:37Z |
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 |
NASCIMENTO, Alexandre Romão Costa. effect of boron addition on the microstructure and wear resistance of a spray-formed AISI 430 stainless steel. 2014. 103 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2014. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/925 |
identifier_str_mv |
NASCIMENTO, Alexandre Romão Costa. effect of boron addition on the microstructure and wear resistance of a spray-formed AISI 430 stainless steel. 2014. 103 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2014. |
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https://repositorio.ufscar.br/handle/ufscar/925 |
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Universidade Federal de São Carlos |
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