The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel

Metastable cellular structures (MCSs) play a crucial role for the mechanical performance in concentrated alloys during non-equilibrium solidification process. In this paper, typifying the heterogeneous 316L stainless steel by laser additive manufacturing (LAM) process, we examine the microstructures...

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Autores principales:	Na Li, Zhengyang Li, Yujie Wei
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	laser additive manufacturing metastable cellular structures 316L stainless steel coherent precipitates stacking fault energy Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/68d3ae3768a04fc684060a4e7b41b5ba
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spelling	oai:doaj.org-article:68d3ae3768a04fc684060a4e7b41b5ba2021-11-25T18:30:25ZThe Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel10.3390/nano111128592079-4991https://doaj.org/article/68d3ae3768a04fc684060a4e7b41b5ba2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2859https://doaj.org/toc/2079-4991Metastable cellular structures (MCSs) play a crucial role for the mechanical performance in concentrated alloys during non-equilibrium solidification process. In this paper, typifying the heterogeneous 316L stainless steel by laser additive manufacturing (LAM) process, we examine the microstructures in cellular interiors and cellular boundaries in detail, and reveal the interactions of dislocations and twins with cellular boundaries. Highly ordered coherent precipitates present along the cellular boundary, resulting from spinodal decomposition by local chemical fluctuation. The co-existences of precipitates and high density of tangled dislocations at cellular boundaries serve as walls for extra hardening. Furthermore, local chemical fluctuation in MCSs inducing variation in stacking fault energy is another important factor for ductility enhancement. These findings shed light on possible routines to further alter nanostructures, including precipitates and dislocation structures, by tailoring local chemistry in MCSs during LAM.Na LiZhengyang LiYujie WeiMDPI AGarticlelaser additive manufacturingmetastable cellular structures316L stainless steelcoherent precipitatesstacking fault energyChemistryQD1-999ENNanomaterials, Vol 11, Iss 2859, p 2859 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	laser additive manufacturing metastable cellular structures 316L stainless steel coherent precipitates stacking fault energy Chemistry QD1-999
spellingShingle	laser additive manufacturing metastable cellular structures 316L stainless steel coherent precipitates stacking fault energy Chemistry QD1-999 Na Li Zhengyang Li Yujie Wei The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel
description	Metastable cellular structures (MCSs) play a crucial role for the mechanical performance in concentrated alloys during non-equilibrium solidification process. In this paper, typifying the heterogeneous 316L stainless steel by laser additive manufacturing (LAM) process, we examine the microstructures in cellular interiors and cellular boundaries in detail, and reveal the interactions of dislocations and twins with cellular boundaries. Highly ordered coherent precipitates present along the cellular boundary, resulting from spinodal decomposition by local chemical fluctuation. The co-existences of precipitates and high density of tangled dislocations at cellular boundaries serve as walls for extra hardening. Furthermore, local chemical fluctuation in MCSs inducing variation in stacking fault energy is another important factor for ductility enhancement. These findings shed light on possible routines to further alter nanostructures, including precipitates and dislocation structures, by tailoring local chemistry in MCSs during LAM.
format	article
author	Na Li Zhengyang Li Yujie Wei
author_facet	Na Li Zhengyang Li Yujie Wei
author_sort	Na Li
title	The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel
title_short	The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel
title_full	The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel
title_fullStr	The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel
title_full_unstemmed	The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel
title_sort	influence of metastable cellular structure on deformation behavior in laser additively manufactured 316l stainless steel
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/68d3ae3768a04fc684060a4e7b41b5ba
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The Influence of Metastable Cellular Structure on Deformation Behavior in Laser Additively Manufactured 316L Stainless Steel

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