Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition

Herein, laser remelting (LRM) technology was adopted for the stainless steel 316L deposited using the directed energy deposition (DED) process. We focused on examining the scanning direction, laser power, and overlap, which are the main parameters of LRM, and changes in the surface characteristics a...

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Autores principales:	Seung Yeong Cho, Gwang Yong Shin, Do Sik Shim
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Directed energy deposition Stainless steel Laser remelting Roughness Analysis of variance Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/00e601a9d2e94abeaa3623c1b926a993
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spelling	oai:doaj.org-article:00e601a9d2e94abeaa3623c1b926a9932021-11-26T04:31:07ZEffect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition2238-785410.1016/j.jmrt.2021.11.054https://doaj.org/article/00e601a9d2e94abeaa3623c1b926a9932021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013338https://doaj.org/toc/2238-7854Herein, laser remelting (LRM) technology was adopted for the stainless steel 316L deposited using the directed energy deposition (DED) process. We focused on examining the scanning direction, laser power, and overlap, which are the main parameters of LRM, and changes in the surface characteristics after LRM. The LRM could remove the traces of the spatter, unmelted powder, and deposited tracks remaining on the DEDed surface. Moreover, overlap was the major factor affecting the surface roughness and waviness. The roughness and waviness of the LRM-treated surface decreased as the overlap increased. An interaction was observed between the laser power and overlap in terms of the surface roughness, and when the laser power was high and the overlap was large, the surface roughness was low. Furthermore, the laser power of 1200 W transferred the excess energy to the surface, reducing the surface improvement. After performing LRM, the thermodynamically unstable crystal grains recrystallized. From the X-ray diffraction results, face-centered cubic and body-centered cubic phases were observed; however, no difference was observed in the phase fraction ratio before and after the LRM treatment. Regarding residual stress measurements, no obvious effect was observed on the removal of tensile residual stress formed on the as-prepared surface. For this reason, the change in hardness after LRM was not significant (increased by 10.7%). However, the costs of postprocessing, such as machining and grinding, can be partially reduced using LRM after DED processing.Seung Yeong ChoGwang Yong ShinDo Sik ShimElsevierarticleDirected energy depositionStainless steelLaser remeltingRoughnessAnalysis of varianceMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 5814-5832 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Directed energy deposition Stainless steel Laser remelting Roughness Analysis of variance Mining engineering. Metallurgy TN1-997
spellingShingle	Directed energy deposition Stainless steel Laser remelting Roughness Analysis of variance Mining engineering. Metallurgy TN1-997 Seung Yeong Cho Gwang Yong Shin Do Sik Shim Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
description	Herein, laser remelting (LRM) technology was adopted for the stainless steel 316L deposited using the directed energy deposition (DED) process. We focused on examining the scanning direction, laser power, and overlap, which are the main parameters of LRM, and changes in the surface characteristics after LRM. The LRM could remove the traces of the spatter, unmelted powder, and deposited tracks remaining on the DEDed surface. Moreover, overlap was the major factor affecting the surface roughness and waviness. The roughness and waviness of the LRM-treated surface decreased as the overlap increased. An interaction was observed between the laser power and overlap in terms of the surface roughness, and when the laser power was high and the overlap was large, the surface roughness was low. Furthermore, the laser power of 1200 W transferred the excess energy to the surface, reducing the surface improvement. After performing LRM, the thermodynamically unstable crystal grains recrystallized. From the X-ray diffraction results, face-centered cubic and body-centered cubic phases were observed; however, no difference was observed in the phase fraction ratio before and after the LRM treatment. Regarding residual stress measurements, no obvious effect was observed on the removal of tensile residual stress formed on the as-prepared surface. For this reason, the change in hardness after LRM was not significant (increased by 10.7%). However, the costs of postprocessing, such as machining and grinding, can be partially reduced using LRM after DED processing.
format	article
author	Seung Yeong Cho Gwang Yong Shin Do Sik Shim
author_facet	Seung Yeong Cho Gwang Yong Shin Do Sik Shim
author_sort	Seung Yeong Cho
title	Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
title_short	Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
title_full	Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
title_fullStr	Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
title_full_unstemmed	Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
title_sort	effect of laser remelting on the surface characteristics of 316l stainless steel fabricated via directed energy deposition
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/00e601a9d2e94abeaa3623c1b926a993
work_keys_str_mv	AT seungyeongcho effectoflaserremeltingonthesurfacecharacteristicsof316lstainlesssteelfabricatedviadirectedenergydeposition AT gwangyongshin effectoflaserremeltingonthesurfacecharacteristicsof316lstainlesssteelfabricatedviadirectedenergydeposition AT dosikshim effectoflaserremeltingonthesurfacecharacteristicsof316lstainlesssteelfabricatedviadirectedenergydeposition
_version_	1718409820787179520

Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition

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