High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s11661-021-06252-2 http://hdl.handle.net/11449/207557 |
Resumo: | The present investigations focused on the thermal oxidation of two variants of MAR-M246 alloy having the same contents of Ta and Nb in at. pct, considering the effects of total replacement of Ta by Nb. The alloys were produced by investment casting using high purity elements in induction furnace under vacuum atmosphere. The alloys were oxidized pseudo-isothermally at 800 °C, 900 °C and 1000 °C up to 1000 hours under lab air. Protective oxidation products growing on the surface of the oxidized samples were mainly Al2O3, Cr2O3. Other less protective oxide such as spinels (NiCr2O4 and CoCr2O4) and TiO2 were also detected as oxidation products. The conventional alloy exhibited slight internal oxidation at 800 °C and an enhanced resistance at 900 °C and 1000 °C. The Nb-modified alloy presented an exacerbated internal oxidation and nitridation at 900 °C and 1000 °C and an enhanced resistance at 800 °C. At 1000 °C, Nb-modified alloy was particularly affected by excessive spalling as the main damage mechanisms. From a kinetic point of view, both alloys exhibit the same behavior at 800 °C and 900 °C, with kp values typical of alumina forming alloys (2 × 10−14 to 3.6 × 10−13 g2 cm−4 s−1). However, Ta modified alloys exhibited superior oxidation resistance at 1000 °C when compared to the Nb modified alloy due to better adherence of the protective oxide scale. |
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High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based SuperalloyThe present investigations focused on the thermal oxidation of two variants of MAR-M246 alloy having the same contents of Ta and Nb in at. pct, considering the effects of total replacement of Ta by Nb. The alloys were produced by investment casting using high purity elements in induction furnace under vacuum atmosphere. The alloys were oxidized pseudo-isothermally at 800 °C, 900 °C and 1000 °C up to 1000 hours under lab air. Protective oxidation products growing on the surface of the oxidized samples were mainly Al2O3, Cr2O3. Other less protective oxide such as spinels (NiCr2O4 and CoCr2O4) and TiO2 were also detected as oxidation products. The conventional alloy exhibited slight internal oxidation at 800 °C and an enhanced resistance at 900 °C and 1000 °C. The Nb-modified alloy presented an exacerbated internal oxidation and nitridation at 900 °C and 1000 °C and an enhanced resistance at 800 °C. At 1000 °C, Nb-modified alloy was particularly affected by excessive spalling as the main damage mechanisms. From a kinetic point of view, both alloys exhibit the same behavior at 800 °C and 900 °C, with kp values typical of alumina forming alloys (2 × 10−14 to 3.6 × 10−13 g2 cm−4 s−1). However, Ta modified alloys exhibited superior oxidation resistance at 1000 °C when compared to the Nb modified alloy due to better adherence of the protective oxide scale.Engineering School of Lorena Department of Materials Engineering University of São Paulo, Poló-Urbo Industrial, s/n - Zona RuralDepartment of Metallurgy Federal Center for Technological Education Celso Suckow da Fonseca (CEFET-RJ), R. do Areal, 522 - Parque PerequêPhysics and Mechanics of Materials Department Institut Pprime UPR CNRS 3346 ISAE ENSMA, Avenue Clément Ader, BP 40109São Paulo State University (UNESP), Campus of Itapeva, Rua Geraldo Alckmin 519, Vila Nossa Senhora de FátimaSão Paulo State University (UNESP), Campus of Itapeva, Rua Geraldo Alckmin 519, Vila Nossa Senhora de FátimaUniversidade de São Paulo (USP)Federal Center for Technological Education Celso Suckow da Fonseca (CEFET-RJ)ISAE ENSMAUniversidade Estadual Paulista (Unesp)Alkmin, L. B.Chaia, N.Utada, S.Cormier, J.Baldan, R. [UNESP]Coelho, G.Nunes, C. A.2021-06-25T10:57:15Z2021-06-25T10:57:15Z2021-06-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article2589-2600http://dx.doi.org/10.1007/s11661-021-06252-2Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v. 52, n. 6, p. 2589-2600, 2021.1073-5623http://hdl.handle.net/11449/20755710.1007/s11661-021-06252-22-s2.0-85103640091Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Scienceinfo:eu-repo/semantics/openAccess2021-10-23T17:30:25Zoai:repositorio.unesp.br:11449/207557Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:39:00.451817Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
title |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
spellingShingle |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy Alkmin, L. B. |
title_short |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
title_full |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
title_fullStr |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
title_full_unstemmed |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
title_sort |
High Temperature Oxidation Behavior of Conventional and Nb-Modified MAR-M246 Ni-Based Superalloy |
author |
Alkmin, L. B. |
author_facet |
Alkmin, L. B. Chaia, N. Utada, S. Cormier, J. Baldan, R. [UNESP] Coelho, G. Nunes, C. A. |
author_role |
author |
author2 |
Chaia, N. Utada, S. Cormier, J. Baldan, R. [UNESP] Coelho, G. Nunes, C. A. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Federal Center for Technological Education Celso Suckow da Fonseca (CEFET-RJ) ISAE ENSMA Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Alkmin, L. B. Chaia, N. Utada, S. Cormier, J. Baldan, R. [UNESP] Coelho, G. Nunes, C. A. |
description |
The present investigations focused on the thermal oxidation of two variants of MAR-M246 alloy having the same contents of Ta and Nb in at. pct, considering the effects of total replacement of Ta by Nb. The alloys were produced by investment casting using high purity elements in induction furnace under vacuum atmosphere. The alloys were oxidized pseudo-isothermally at 800 °C, 900 °C and 1000 °C up to 1000 hours under lab air. Protective oxidation products growing on the surface of the oxidized samples were mainly Al2O3, Cr2O3. Other less protective oxide such as spinels (NiCr2O4 and CoCr2O4) and TiO2 were also detected as oxidation products. The conventional alloy exhibited slight internal oxidation at 800 °C and an enhanced resistance at 900 °C and 1000 °C. The Nb-modified alloy presented an exacerbated internal oxidation and nitridation at 900 °C and 1000 °C and an enhanced resistance at 800 °C. At 1000 °C, Nb-modified alloy was particularly affected by excessive spalling as the main damage mechanisms. From a kinetic point of view, both alloys exhibit the same behavior at 800 °C and 900 °C, with kp values typical of alumina forming alloys (2 × 10−14 to 3.6 × 10−13 g2 cm−4 s−1). However, Ta modified alloys exhibited superior oxidation resistance at 1000 °C when compared to the Nb modified alloy due to better adherence of the protective oxide scale. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T10:57:15Z 2021-06-25T10:57:15Z 2021-06-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s11661-021-06252-2 Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v. 52, n. 6, p. 2589-2600, 2021. 1073-5623 http://hdl.handle.net/11449/207557 10.1007/s11661-021-06252-2 2-s2.0-85103640091 |
url |
http://dx.doi.org/10.1007/s11661-021-06252-2 http://hdl.handle.net/11449/207557 |
identifier_str_mv |
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v. 52, n. 6, p. 2589-2600, 2021. 1073-5623 10.1007/s11661-021-06252-2 2-s2.0-85103640091 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
2589-2600 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129343888556032 |