Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , , , |
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=S1516-14392005000400003 |
Resumo: | Generally, oxide scales formed on high Cr steels are multi-layered and the kinetics are strongly influenced by the alloy grain boundaries. In the present study, the oxidation behaviour of an austenite steel TP347 with different grain sizes was studied to identify the role of grain-boundaries in the oxidation process. Heat treatment in an inert gas atmosphere at 1050 °C was applied to modify the grain size of the steel TP347. The mass gain during subsequent oxidation was measured using a microbalance with a resolution of 10-5 g. The scale morphology was examined using SEM in combination with energy-dispersive X-ray spectroscopy (EDS). Oxidation of TP347 with a grain size of 4 µm at 750 °C in air follows a parabolic rate law. For a larger grain size (65 µm), complex kinetics is observed with a fast initial oxidation followed by several different parabolic oxidation stages. SEM examinations indicated that the scale formed on specimens with smaller grain size was predominantly Cr2O3, with some FeCr2O4 at localized sites. For specimens with larger grain size the main oxide is iron oxide. It can be concluded that protective Cr2O3 formation is promoted by a high density of fast grain-boundary diffusion paths which is the case for fine-grained materials. |
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Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347austenitic steelCr2O3 formationgrain boundary diffusionhigh-temperature oxidationGenerally, oxide scales formed on high Cr steels are multi-layered and the kinetics are strongly influenced by the alloy grain boundaries. In the present study, the oxidation behaviour of an austenite steel TP347 with different grain sizes was studied to identify the role of grain-boundaries in the oxidation process. Heat treatment in an inert gas atmosphere at 1050 °C was applied to modify the grain size of the steel TP347. The mass gain during subsequent oxidation was measured using a microbalance with a resolution of 10-5 g. The scale morphology was examined using SEM in combination with energy-dispersive X-ray spectroscopy (EDS). Oxidation of TP347 with a grain size of 4 µm at 750 °C in air follows a parabolic rate law. For a larger grain size (65 µm), complex kinetics is observed with a fast initial oxidation followed by several different parabolic oxidation stages. SEM examinations indicated that the scale formed on specimens with smaller grain size was predominantly Cr2O3, with some FeCr2O4 at localized sites. For specimens with larger grain size the main oxide is iron oxide. It can be concluded that protective Cr2O3 formation is promoted by a high density of fast grain-boundary diffusion paths which is the case for fine-grained materials.ABM, ABC, ABPol2005-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000400003Materials Research v.8 n.4 2005reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392005000400003info:eu-repo/semantics/openAccessTrindade,Vicente BrazKrupp,UlrichHanjari,Behzad ZandiYang,SonglanChrist,Hans-Jürgeneng2006-01-31T00:00:00Zoai:scielo:S1516-14392005000400003Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2006-01-31T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
title |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
spellingShingle |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 Trindade,Vicente Braz austenitic steel Cr2O3 formation grain boundary diffusion high-temperature oxidation |
title_short |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
title_full |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
title_fullStr |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
title_full_unstemmed |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
title_sort |
Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347 |
author |
Trindade,Vicente Braz |
author_facet |
Trindade,Vicente Braz Krupp,Ulrich Hanjari,Behzad Zandi Yang,Songlan Christ,Hans-Jürgen |
author_role |
author |
author2 |
Krupp,Ulrich Hanjari,Behzad Zandi Yang,Songlan Christ,Hans-Jürgen |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Trindade,Vicente Braz Krupp,Ulrich Hanjari,Behzad Zandi Yang,Songlan Christ,Hans-Jürgen |
dc.subject.por.fl_str_mv |
austenitic steel Cr2O3 formation grain boundary diffusion high-temperature oxidation |
topic |
austenitic steel Cr2O3 formation grain boundary diffusion high-temperature oxidation |
description |
Generally, oxide scales formed on high Cr steels are multi-layered and the kinetics are strongly influenced by the alloy grain boundaries. In the present study, the oxidation behaviour of an austenite steel TP347 with different grain sizes was studied to identify the role of grain-boundaries in the oxidation process. Heat treatment in an inert gas atmosphere at 1050 °C was applied to modify the grain size of the steel TP347. The mass gain during subsequent oxidation was measured using a microbalance with a resolution of 10-5 g. The scale morphology was examined using SEM in combination with energy-dispersive X-ray spectroscopy (EDS). Oxidation of TP347 with a grain size of 4 µm at 750 °C in air follows a parabolic rate law. For a larger grain size (65 µm), complex kinetics is observed with a fast initial oxidation followed by several different parabolic oxidation stages. SEM examinations indicated that the scale formed on specimens with smaller grain size was predominantly Cr2O3, with some FeCr2O4 at localized sites. For specimens with larger grain size the main oxide is iron oxide. It can be concluded that protective Cr2O3 formation is promoted by a high density of fast grain-boundary diffusion paths which is the case for fine-grained materials. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005-12-01 |
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=S1516-14392005000400003 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000400003 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1516-14392005000400003 |
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.8 n.4 2005 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 |
_version_ |
1754212658124423168 |