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 principales:	Hossein Eskandari Sabzi, Everth Hernandez-Nava, Xiao-Hui Li, Hanwei Fu, David San-Martín, Pedro E.J. Rivera-Díaz-del-Castillo
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Laser powder bed fusion Mechanical properties Stainless steel Grain refinement Microstructure Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/bd39afde743c4667a0b1a6bd94de7c88
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spelling	oai:doaj.org-article:bd39afde743c4667a0b1a6bd94de7c882021-11-18T04:43:28ZStrengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering0264-127510.1016/j.matdes.2021.110246https://doaj.org/article/bd39afde743c4667a0b1a6bd94de7c882021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0264127521008017https://doaj.org/toc/0264-1275A 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.Hossein Eskandari SabziEverth Hernandez-NavaXiao-Hui LiHanwei FuDavid San-MartínPedro E.J. Rivera-Díaz-del-CastilloElsevierarticleLaser powder bed fusionMechanical propertiesStainless steelGrain refinementMicrostructureMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110246- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Laser powder bed fusion Mechanical properties Stainless steel Grain refinement Microstructure Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Laser powder bed fusion Mechanical properties Stainless steel Grain refinement Microstructure Materials of engineering and construction. Mechanics of materials TA401-492 Hossein Eskandari Sabzi Everth Hernandez-Nava Xiao-Hui Li Hanwei Fu David San-Martín Pedro E.J. Rivera-Díaz-del-Castillo Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
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.
format	article
author	Hossein Eskandari Sabzi Everth Hernandez-Nava Xiao-Hui Li Hanwei Fu David San-Martín Pedro E.J. Rivera-Díaz-del-Castillo
author_facet	Hossein Eskandari Sabzi Everth Hernandez-Nava Xiao-Hui Li Hanwei Fu David San-Martín Pedro E.J. Rivera-Díaz-del-Castillo
author_sort	Hossein Eskandari Sabzi
title	Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering
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
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/bd39afde743c4667a0b1a6bd94de7c88
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Strengthening control in laser powder bed fusion of austenitic stainless steels via grain boundary engineering

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