Mechanical strength of ground WC-Co cemented carbides after coating deposition

Manufacturing of hardmetal tools often involves surface grinding, ion etching and final coating. Each stage throughout the manufacturing chain introduces surface integrity changes which may be critical for defining the final mechanical behavior of the coated tools. Within this context, an experiment...

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Autores: Yang, Jing, Odén, Magnus, Johansson Jõesaar, Mats Peter, Esteve Pujol, Joan, Llanes Pitarch, Luis Miguel
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2017
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/120579
Acceso en línea:https://hdl.handle.net/2445/120579
Access Level:acceso abierto
Palabra clave:Carburs
Carbides
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spelling Mechanical strength of ground WC-Co cemented carbides after coating depositionYang, JingOdén, MagnusJohansson Jõesaar, Mats PeterEsteve Pujol, JoanLlanes Pitarch, Luis MiguelCarbursCarbidesManufacturing of hardmetal tools often involves surface grinding, ion etching and final coating. Each stage throughout the manufacturing chain introduces surface integrity changes which may be critical for defining the final mechanical behavior of the coated tools. Within this context, an experimental test program has been developed to assess the influence of a coating (TiN) deposition on surface integrity and transverse rupture strength of a previously ground fine-grained WC-Co grade substrate. Four different substrate surface finish conditions (prior to ion etching and coating) were evaluated: as sintered (AS), ground (G), polished (P), and ground plus high temperature annealing (GTT). Surface integrity and fracture resistance characterization, complemented with a detailed fractographic analysis, were performed on both uncoated and coated samples. Results show that the surface integrity after grinding has been partly modified during the ion etching and film deposition processes, particularly in terms of a reduced compressive residual stress state at the substrate surface level. Consequently, the grinding induced strength enhancement in hardmetals is reduced for coated specimens. Main reason behind it is the change of nature, location and stress state acting on critical flaw: from processing defects existing at the subsurface (uncoated G specimens) to grinding-induced microcracks located close to the interface between coating and substrate, but within the subsurface of the latter (coated G specimens). This is not the case for AS and P conditions, where flexural strength does not change as a result of ion etching and coating. Finally, fracture resistance increases slightly for GTT specimens after coating process, possibly caused by a beneficial effect of the deposited film on the residual stress state at the surfaceElsevier201820172018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion21 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/120579Articles publicats en revistes (Física Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1016/j.msea.2017.02.034Materials Science and Engineering: A Structural Materials: Properties, Microstructure and Processing, 2017, vol. 689, p. 72-77https://doi.org/10.1016/j.msea.2017.02.034cc-by-nc-nd (c) Elsevier, 2017http://creativecommons.org/licenses/by-nc-nd/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1205792026-05-29T05:05:01Z
dc.title.none.fl_str_mv Mechanical strength of ground WC-Co cemented carbides after coating deposition
title Mechanical strength of ground WC-Co cemented carbides after coating deposition
spellingShingle Mechanical strength of ground WC-Co cemented carbides after coating deposition
Yang, Jing
Carburs
Carbides
title_short Mechanical strength of ground WC-Co cemented carbides after coating deposition
title_full Mechanical strength of ground WC-Co cemented carbides after coating deposition
title_fullStr Mechanical strength of ground WC-Co cemented carbides after coating deposition
title_full_unstemmed Mechanical strength of ground WC-Co cemented carbides after coating deposition
title_sort Mechanical strength of ground WC-Co cemented carbides after coating deposition
dc.creator.none.fl_str_mv Yang, Jing
Odén, Magnus
Johansson Jõesaar, Mats Peter
Esteve Pujol, Joan
Llanes Pitarch, Luis Miguel
author Yang, Jing
author_facet Yang, Jing
Odén, Magnus
Johansson Jõesaar, Mats Peter
Esteve Pujol, Joan
Llanes Pitarch, Luis Miguel
author_role author
author2 Odén, Magnus
Johansson Jõesaar, Mats Peter
Esteve Pujol, Joan
Llanes Pitarch, Luis Miguel
author2_role author
author
author
author
dc.subject.none.fl_str_mv Carburs
Carbides
topic Carburs
Carbides
description Manufacturing of hardmetal tools often involves surface grinding, ion etching and final coating. Each stage throughout the manufacturing chain introduces surface integrity changes which may be critical for defining the final mechanical behavior of the coated tools. Within this context, an experimental test program has been developed to assess the influence of a coating (TiN) deposition on surface integrity and transverse rupture strength of a previously ground fine-grained WC-Co grade substrate. Four different substrate surface finish conditions (prior to ion etching and coating) were evaluated: as sintered (AS), ground (G), polished (P), and ground plus high temperature annealing (GTT). Surface integrity and fracture resistance characterization, complemented with a detailed fractographic analysis, were performed on both uncoated and coated samples. Results show that the surface integrity after grinding has been partly modified during the ion etching and film deposition processes, particularly in terms of a reduced compressive residual stress state at the substrate surface level. Consequently, the grinding induced strength enhancement in hardmetals is reduced for coated specimens. Main reason behind it is the change of nature, location and stress state acting on critical flaw: from processing defects existing at the subsurface (uncoated G specimens) to grinding-induced microcracks located close to the interface between coating and substrate, but within the subsurface of the latter (coated G specimens). This is not the case for AS and P conditions, where flexural strength does not change as a result of ion etching and coating. Finally, fracture resistance increases slightly for GTT specimens after coating process, possibly caused by a beneficial effect of the deposited film on the residual stress state at the surface
publishDate 2017
dc.date.none.fl_str_mv 2017
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/120579
url https://hdl.handle.net/2445/120579
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1016/j.msea.2017.02.034
Materials Science and Engineering: A Structural Materials: Properties, Microstructure and Processing, 2017, vol. 689, p. 72-77
https://doi.org/10.1016/j.msea.2017.02.034
dc.rights.none.fl_str_mv cc-by-nc-nd (c) Elsevier, 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-nc-nd (c) Elsevier, 2017
http://creativecommons.org/licenses/by-nc-nd/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 21 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv Articles publicats en revistes (Física Aplicada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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