Fracture behaviour of a new submicron grained cemented carbide
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-83122008000100008 |
Resumo: | In this work, the effect of increasing argon pressure applied on a post-sintering treatment from 3 MPa to 100 MPa on the mechanical properties of a newly developed hardmetal grade, namely, hardness, flexural strength and fracture toughness, is reported. The as-received material has been previously sintered at 1460ºC under 2 MPa argon pressure from powder mixtures of WC and 3.5 wt% Co together with minor additions of VC, graphite and a pressing lubricant. By increasing the argon pressure, a significant increase in flexural strength from » 1500 MPa to » 3000 MPa was observed, whilst hardness (HV30»2000) and fracture toughness (»8 MN.m-3/2) remained practically unchanged. Both microstructural and fractographic studies revealed that this is mainly attributed to a decrease in the amount and size of microstructural defects (namely, pores and metallic inclusions). Furthermore, fracture has been found to occur mainly by intrinsic (bulk) defects rather than surface-related ones, suggesting that surface finishing did not affect flexural strength measurements. Hot isostatic pressing has been successfully used to consolidate WC-3.5wt% Co composites with submicron WC grains size confirming that porosity reduction results in flexural strength improvement. |
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Fracture behaviour of a new submicron grained cemented carbideHardmetalFlexural strengthFractographyFracture toughnessMicrostructureIn this work, the effect of increasing argon pressure applied on a post-sintering treatment from 3 MPa to 100 MPa on the mechanical properties of a newly developed hardmetal grade, namely, hardness, flexural strength and fracture toughness, is reported. The as-received material has been previously sintered at 1460ºC under 2 MPa argon pressure from powder mixtures of WC and 3.5 wt% Co together with minor additions of VC, graphite and a pressing lubricant. By increasing the argon pressure, a significant increase in flexural strength from » 1500 MPa to » 3000 MPa was observed, whilst hardness (HV30»2000) and fracture toughness (»8 MN.m-3/2) remained practically unchanged. Both microstructural and fractographic studies revealed that this is mainly attributed to a decrease in the amount and size of microstructural defects (namely, pores and metallic inclusions). Furthermore, fracture has been found to occur mainly by intrinsic (bulk) defects rather than surface-related ones, suggesting that surface finishing did not affect flexural strength measurements. Hot isostatic pressing has been successfully used to consolidate WC-3.5wt% Co composites with submicron WC grains size confirming that porosity reduction results in flexural strength improvement.Sociedade Portuguesa de Materiais2008-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articletext/htmlhttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-83122008000100008Ciência & Tecnologia dos Materiais v.20 n.1-2 2008reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAPenghttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-83122008000100008Oliveira,F.A. CostaLopes,A.C.Fernandes,J. CruzSacramento,J.Valente,M.A.info:eu-repo/semantics/openAccess2024-02-06T17:01:04Zoai:scielo:S0870-83122008000100008Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:16:41.516332Repositório 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 |
Fracture behaviour of a new submicron grained cemented carbide |
title |
Fracture behaviour of a new submicron grained cemented carbide |
spellingShingle |
Fracture behaviour of a new submicron grained cemented carbide Oliveira,F.A. Costa Hardmetal Flexural strength Fractography Fracture toughness Microstructure |
title_short |
Fracture behaviour of a new submicron grained cemented carbide |
title_full |
Fracture behaviour of a new submicron grained cemented carbide |
title_fullStr |
Fracture behaviour of a new submicron grained cemented carbide |
title_full_unstemmed |
Fracture behaviour of a new submicron grained cemented carbide |
title_sort |
Fracture behaviour of a new submicron grained cemented carbide |
author |
Oliveira,F.A. Costa |
author_facet |
Oliveira,F.A. Costa Lopes,A.C. Fernandes,J. Cruz Sacramento,J. Valente,M.A. |
author_role |
author |
author2 |
Lopes,A.C. Fernandes,J. Cruz Sacramento,J. Valente,M.A. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Oliveira,F.A. Costa Lopes,A.C. Fernandes,J. Cruz Sacramento,J. Valente,M.A. |
dc.subject.por.fl_str_mv |
Hardmetal Flexural strength Fractography Fracture toughness Microstructure |
topic |
Hardmetal Flexural strength Fractography Fracture toughness Microstructure |
description |
In this work, the effect of increasing argon pressure applied on a post-sintering treatment from 3 MPa to 100 MPa on the mechanical properties of a newly developed hardmetal grade, namely, hardness, flexural strength and fracture toughness, is reported. The as-received material has been previously sintered at 1460ºC under 2 MPa argon pressure from powder mixtures of WC and 3.5 wt% Co together with minor additions of VC, graphite and a pressing lubricant. By increasing the argon pressure, a significant increase in flexural strength from » 1500 MPa to » 3000 MPa was observed, whilst hardness (HV30»2000) and fracture toughness (»8 MN.m-3/2) remained practically unchanged. Both microstructural and fractographic studies revealed that this is mainly attributed to a decrease in the amount and size of microstructural defects (namely, pores and metallic inclusions). Furthermore, fracture has been found to occur mainly by intrinsic (bulk) defects rather than surface-related ones, suggesting that surface finishing did not affect flexural strength measurements. Hot isostatic pressing has been successfully used to consolidate WC-3.5wt% Co composites with submicron WC grains size confirming that porosity reduction results in flexural strength improvement. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-01-01 |
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://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-83122008000100008 |
url |
http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-83122008000100008 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-83122008000100008 |
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 |
Sociedade Portuguesa de Materiais |
publisher.none.fl_str_mv |
Sociedade Portuguesa de Materiais |
dc.source.none.fl_str_mv |
Ciência & Tecnologia dos Materiais v.20 n.1-2 2008 reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137263241658368 |