Microstructural Evaluation of an Austempered Cast Iron Alloy

Detalhes bibliográficos
Autor(a) principal: Pereira,Letyssia Niara De Godoi
Data de Publicação: 2022
Outros Autores: Medeiros,Ronaldo Gomes de Castro, Freitas,Patrícia Guimarães Monteiro de, Silva,Camila Ferreira da, Silva,Leonardo Martins da, Leal,Ricardo Henriques
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100282
Resumo: Abstract ADI are the result of graphite nodules and ausferrite microstructure (acicular ferrite + retained austenite). Over the past few years, ADI has become an important material for engineering due to its excellent mechanical properties (outstanding ductility, high mechanical strength and good toughness) and low cost. It is known the discussion of process variables such as austempering time and temperature are extremely important for the microstructural and hardness study of these materials. Thus, in the present work, ADI cast iron was investigated under twelve different austenitic conditions, aiming to characterize the influence of the amount of austenite on the ferritic matrix on the mechanical property of hardness. The heat treatment parameters vary from three different times (40 min, 90 min and 180 min) under four temperatures (280ºC, 300 ºC, 320 ºC and 370ºC). Results show there is a decreasing of hardness linked to the increasing of retained austenite % volume. The greater amount of retained austenite % volume in the matrix was presented by sample A14, treated during 40 minutes under 370ºC and presenting 32.30% of this microconstituint. The amounts of each phase present in the studied materials were raised by quantitative metallography through the software Fiji-ImageJ, allowing a comparison of the results obtained by these two methods. Time differences on the austempering heating treatment did not show several implications on ADI microstructure. In addition, analyzes of the graphite nodules were performed.
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spelling Microstructural Evaluation of an Austempered Cast Iron AlloyAustempered Ductile Iron – ADIMetallographyMicrostructureThermal treatmentAbstract ADI are the result of graphite nodules and ausferrite microstructure (acicular ferrite + retained austenite). Over the past few years, ADI has become an important material for engineering due to its excellent mechanical properties (outstanding ductility, high mechanical strength and good toughness) and low cost. It is known the discussion of process variables such as austempering time and temperature are extremely important for the microstructural and hardness study of these materials. Thus, in the present work, ADI cast iron was investigated under twelve different austenitic conditions, aiming to characterize the influence of the amount of austenite on the ferritic matrix on the mechanical property of hardness. The heat treatment parameters vary from three different times (40 min, 90 min and 180 min) under four temperatures (280ºC, 300 ºC, 320 ºC and 370ºC). Results show there is a decreasing of hardness linked to the increasing of retained austenite % volume. The greater amount of retained austenite % volume in the matrix was presented by sample A14, treated during 40 minutes under 370ºC and presenting 32.30% of this microconstituint. The amounts of each phase present in the studied materials were raised by quantitative metallography through the software Fiji-ImageJ, allowing a comparison of the results obtained by these two methods. Time differences on the austempering heating treatment did not show several implications on ADI microstructure. In addition, analyzes of the graphite nodules were performed.ABM, ABC, ABPol2022-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100282Materials Research v.25 2022reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2021-0256info:eu-repo/semantics/openAccessPereira,Letyssia Niara De GodoiMedeiros,Ronaldo Gomes de CastroFreitas,Patrícia Guimarães Monteiro deSilva,Camila Ferreira daSilva,Leonardo Martins daLeal,Ricardo Henriqueseng2022-03-03T00:00:00Zoai:scielo:S1516-14392022000100282Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2022-03-03T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Microstructural Evaluation of an Austempered Cast Iron Alloy
title Microstructural Evaluation of an Austempered Cast Iron Alloy
spellingShingle Microstructural Evaluation of an Austempered Cast Iron Alloy
Pereira,Letyssia Niara De Godoi
Austempered Ductile Iron – ADI
Metallography
Microstructure
Thermal treatment
title_short Microstructural Evaluation of an Austempered Cast Iron Alloy
title_full Microstructural Evaluation of an Austempered Cast Iron Alloy
title_fullStr Microstructural Evaluation of an Austempered Cast Iron Alloy
title_full_unstemmed Microstructural Evaluation of an Austempered Cast Iron Alloy
title_sort Microstructural Evaluation of an Austempered Cast Iron Alloy
author Pereira,Letyssia Niara De Godoi
author_facet Pereira,Letyssia Niara De Godoi
Medeiros,Ronaldo Gomes de Castro
Freitas,Patrícia Guimarães Monteiro de
Silva,Camila Ferreira da
Silva,Leonardo Martins da
Leal,Ricardo Henriques
author_role author
author2 Medeiros,Ronaldo Gomes de Castro
Freitas,Patrícia Guimarães Monteiro de
Silva,Camila Ferreira da
Silva,Leonardo Martins da
Leal,Ricardo Henriques
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Pereira,Letyssia Niara De Godoi
Medeiros,Ronaldo Gomes de Castro
Freitas,Patrícia Guimarães Monteiro de
Silva,Camila Ferreira da
Silva,Leonardo Martins da
Leal,Ricardo Henriques
dc.subject.por.fl_str_mv Austempered Ductile Iron – ADI
Metallography
Microstructure
Thermal treatment
topic Austempered Ductile Iron – ADI
Metallography
Microstructure
Thermal treatment
description Abstract ADI are the result of graphite nodules and ausferrite microstructure (acicular ferrite + retained austenite). Over the past few years, ADI has become an important material for engineering due to its excellent mechanical properties (outstanding ductility, high mechanical strength and good toughness) and low cost. It is known the discussion of process variables such as austempering time and temperature are extremely important for the microstructural and hardness study of these materials. Thus, in the present work, ADI cast iron was investigated under twelve different austenitic conditions, aiming to characterize the influence of the amount of austenite on the ferritic matrix on the mechanical property of hardness. The heat treatment parameters vary from three different times (40 min, 90 min and 180 min) under four temperatures (280ºC, 300 ºC, 320 ºC and 370ºC). Results show there is a decreasing of hardness linked to the increasing of retained austenite % volume. The greater amount of retained austenite % volume in the matrix was presented by sample A14, treated during 40 minutes under 370ºC and presenting 32.30% of this microconstituint. The amounts of each phase present in the studied materials were raised by quantitative metallography through the software Fiji-ImageJ, allowing a comparison of the results obtained by these two methods. Time differences on the austempering heating treatment did not show several implications on ADI microstructure. In addition, analyzes of the graphite nodules were performed.
publishDate 2022
dc.date.none.fl_str_mv 2022-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100282
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100282
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1980-5373-mr-2021-0256
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.25 2022
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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