Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens

Detalhes bibliográficos
Autor(a) principal: Borrego, L. P.
Data de Publicação: 2019
Outros Autores: Jesus, J. de, Ferreira, J. A. M., Costa, J. D., Capela, C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/101627
https://doi.org/10.1016/j.prostr.2019.08.075
Resumo: industry, because of its high strength, low weight and excellent biocompatibility. Most of these components work under environmentally assisted cyclic loading, i.e. under corrosion-fatigue. Fatigue performance of additive manufactured alloys is significantly influenced by the porosities, residual stresses, which can be reduced by optimizing the process parameters, thermal treatments or hot isostatic pressing (HIP). Those parameters can also influence significantly to the propagation of cracks under corrosion-fatigue, but the understanding of this subject still needs significant research work. This paper presents the results of a fatigue crack propagation study in titanium TiAl6V4 specimens produced by selective laser melting (SLM), under corrosive ambient. The environment solutions studied were: artificial saliva and 3.5%wt NaCl solution. Tests were performed using standard 6 mm thick compact specimens (CT) tested at R=0.05 and with frequency 10 Hz. The main objective was to study the effect of the environment solution on da/dN-ΔK curves and on the fatigue failure mechanisms. Current work shows a very important accelerating effect on the crack nucleation and fatigue crack propagation for tests under corrosion ambient, particularly for 3.5%wt NaCl solution. Fatigue path shows an irregular path. Secondary cracking was observed in air, but not detected in corrosive ambient.
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spelling Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimensAdditive manufacturingcorrosion-fatiguecrack propagationTitanium TiAl6V4 alloyindustry, because of its high strength, low weight and excellent biocompatibility. Most of these components work under environmentally assisted cyclic loading, i.e. under corrosion-fatigue. Fatigue performance of additive manufactured alloys is significantly influenced by the porosities, residual stresses, which can be reduced by optimizing the process parameters, thermal treatments or hot isostatic pressing (HIP). Those parameters can also influence significantly to the propagation of cracks under corrosion-fatigue, but the understanding of this subject still needs significant research work. This paper presents the results of a fatigue crack propagation study in titanium TiAl6V4 specimens produced by selective laser melting (SLM), under corrosive ambient. The environment solutions studied were: artificial saliva and 3.5%wt NaCl solution. Tests were performed using standard 6 mm thick compact specimens (CT) tested at R=0.05 and with frequency 10 Hz. The main objective was to study the effect of the environment solution on da/dN-ΔK curves and on the fatigue failure mechanisms. Current work shows a very important accelerating effect on the crack nucleation and fatigue crack propagation for tests under corrosion ambient, particularly for 3.5%wt NaCl solution. Fatigue path shows an irregular path. Secondary cracking was observed in air, but not detected in corrosive ambient.2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/101627http://hdl.handle.net/10316/101627https://doi.org/10.1016/j.prostr.2019.08.075eng24523216Borrego, L. P.Jesus, J. deFerreira, J. A. M.Costa, J. D.Capela, C.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-09-05T20:43:28Zoai:estudogeral.uc.pt:10316/101627Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:18:46.877981Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
title Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
spellingShingle Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
Borrego, L. P.
Additive manufacturing
corrosion-fatigue
crack propagation
Titanium TiAl6V4 alloy
title_short Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
title_full Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
title_fullStr Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
title_full_unstemmed Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
title_sort Environmental effect on the fatigue crack propagation of AM TiAl6V4 alloy specimens
author Borrego, L. P.
author_facet Borrego, L. P.
Jesus, J. de
Ferreira, J. A. M.
Costa, J. D.
Capela, C.
author_role author
author2 Jesus, J. de
Ferreira, J. A. M.
Costa, J. D.
Capela, C.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Borrego, L. P.
Jesus, J. de
Ferreira, J. A. M.
Costa, J. D.
Capela, C.
dc.subject.por.fl_str_mv Additive manufacturing
corrosion-fatigue
crack propagation
Titanium TiAl6V4 alloy
topic Additive manufacturing
corrosion-fatigue
crack propagation
Titanium TiAl6V4 alloy
description industry, because of its high strength, low weight and excellent biocompatibility. Most of these components work under environmentally assisted cyclic loading, i.e. under corrosion-fatigue. Fatigue performance of additive manufactured alloys is significantly influenced by the porosities, residual stresses, which can be reduced by optimizing the process parameters, thermal treatments or hot isostatic pressing (HIP). Those parameters can also influence significantly to the propagation of cracks under corrosion-fatigue, but the understanding of this subject still needs significant research work. This paper presents the results of a fatigue crack propagation study in titanium TiAl6V4 specimens produced by selective laser melting (SLM), under corrosive ambient. The environment solutions studied were: artificial saliva and 3.5%wt NaCl solution. Tests were performed using standard 6 mm thick compact specimens (CT) tested at R=0.05 and with frequency 10 Hz. The main objective was to study the effect of the environment solution on da/dN-ΔK curves and on the fatigue failure mechanisms. Current work shows a very important accelerating effect on the crack nucleation and fatigue crack propagation for tests under corrosion ambient, particularly for 3.5%wt NaCl solution. Fatigue path shows an irregular path. Secondary cracking was observed in air, but not detected in corrosive ambient.
publishDate 2019
dc.date.none.fl_str_mv 2019
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/101627
http://hdl.handle.net/10316/101627
https://doi.org/10.1016/j.prostr.2019.08.075
url http://hdl.handle.net/10316/101627
https://doi.org/10.1016/j.prostr.2019.08.075
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