Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering

A new approach to modelling the microstructure evolution and yield strength in laser powder bed fusion components is introduced. Restoration mechanisms such as discontinuous dynamic recrystallization, continuous dynamic recrystallization, and dynamic recovery were found to be activated during laser...

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Autores: Eskandari Sabzi, Hossein, Hernandez-Nava, E., Li, Xiao-Hui, Fu, Hanwei, San-Martín, David, Rivera-Díaz del Castillo, P.E.J.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/259793
Acceso en línea:http://hdl.handle.net/10261/259793
Access Level:acceso abierto
Palabra clave:Laser powder bed fusion
Mechanical properties
Stainless steel
Grain refinement
Microstructure
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spelling Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineeringEskandari Sabzi, HosseinHernandez-Nava, E.Li, Xiao-HuiFu, HanweiSan-Martín, DavidRivera-Díaz del Castillo, P.E.J.Laser powder bed fusionMechanical propertiesStainless steelGrain refinementMicrostructureA new approach to modelling the microstructure evolution and yield strength in laser powder bed fusion components is introduced. Restoration mechanisms such as discontinuous dynamic recrystallization, continuous dynamic recrystallization, and dynamic recovery were found to be activated during laser powder bed fusion of austenitic stainless steels; these are modelled both via classical Zener-Hollomon and thermostatistical approaches. A mechanism is suggested for the formation of dislocation cells from solidification cells and dendrites, and their further transformation to low-angle grain boundaries to form subgrains. This occurs due to dynamic recovery during laser powder bed fusion. The yield strength is successfully modelled via a Hall–Petch-type relationship in terms of the subgrain size, instead of the actual grain size or the dislocation cell size. The validated Hall–Petch-type equation for austenitic stainless steels provides a guideline for the strengthening of laser powder bed fusion alloys with subgrain refinement, via increasing the low-angle grain boundary fraction (grain boundary engineering). To obtain higher strength, dynamic recovery should be promoted as the main mechanism to induce low-angle grain boundaries. The dependency of yield stress on process parameters and alloy composition is quantitatively described.This work was supported by the Royal Academy of Engineering for chair funding (RCSRF1718/5/32), and by EPSRC via DARE grant (EP/L025213/1). HF acknowledges the support by National Natural Science Foundation of China (51971011) and Beihang Top Young Talent Support Programme (KG12079901).ElsevierRoyal Academy of EngineeringNational Natural Science Foundation of ChinaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220212022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/259793reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.matdes.2021.110246Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2597932026-05-22T06:33:51Z
dc.title.none.fl_str_mv Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
title Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
spellingShingle Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
Eskandari Sabzi, Hossein
Laser powder bed fusion
Mechanical properties
Stainless steel
Grain refinement
Microstructure
title_short Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
title_full Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
title_fullStr Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
title_full_unstemmed Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
title_sort Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
dc.creator.none.fl_str_mv Eskandari Sabzi, Hossein
Hernandez-Nava, E.
Li, Xiao-Hui
Fu, Hanwei
San-Martín, David
Rivera-Díaz del Castillo, P.E.J.
author Eskandari Sabzi, Hossein
author_facet Eskandari Sabzi, Hossein
Hernandez-Nava, E.
Li, Xiao-Hui
Fu, Hanwei
San-Martín, David
Rivera-Díaz del Castillo, P.E.J.
author_role author
author2 Hernandez-Nava, E.
Li, Xiao-Hui
Fu, Hanwei
San-Martín, David
Rivera-Díaz del Castillo, P.E.J.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Royal Academy of Engineering
National Natural Science Foundation of China
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Laser powder bed fusion
Mechanical properties
Stainless steel
Grain refinement
Microstructure
topic Laser powder bed fusion
Mechanical properties
Stainless steel
Grain refinement
Microstructure
description A new approach to modelling the microstructure evolution and yield strength in laser powder bed fusion components is introduced. Restoration mechanisms such as discontinuous dynamic recrystallization, continuous dynamic recrystallization, and dynamic recovery were found to be activated during laser powder bed fusion of austenitic stainless steels; these are modelled both via classical Zener-Hollomon and thermostatistical approaches. A mechanism is suggested for the formation of dislocation cells from solidification cells and dendrites, and their further transformation to low-angle grain boundaries to form subgrains. This occurs due to dynamic recovery during laser powder bed fusion. The yield strength is successfully modelled via a Hall–Petch-type relationship in terms of the subgrain size, instead of the actual grain size or the dislocation cell size. The validated Hall–Petch-type equation for austenitic stainless steels provides a guideline for the strengthening of laser powder bed fusion alloys with subgrain refinement, via increasing the low-angle grain boundary fraction (grain boundary engineering). To obtain higher strength, dynamic recovery should be promoted as the main mechanism to induce low-angle grain boundaries. The dependency of yield stress on process parameters and alloy composition is quantitatively described.
publishDate 2021
dc.date.none.fl_str_mv 2021
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/259793
url http://hdl.handle.net/10261/259793
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.matdes.2021.110246
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812429

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