Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion

Gokcekaya, Ozkan; Ishimoto, Takuya; Todo, Tsubasa; Suganuma, Ryoya; Fukushima, Ryo; Narushima, Takayuki; Nakano, Takayoshi

doi:https://doi.org/10.3390/cryst11010009

Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion

Gokcekaya, Ozkan; Ishimoto, Takuya; Todo, Tsubasa et al.

Crystals, 2020, 11(1)

Number of Access:473（2025-07-18 10:23 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89794

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Title	Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion
Creator	CreatorName Gokcekaya, Ozkan
	NRID 1000050508835 1000050508835 ORCID 0000-0003-0081-0591 0000-0003-0081-0591 researchmap permalink i_taku i_taku Scopus Author ID 35310484700 35310484700 CreatorName Ishimoto, Takuya
	CreatorName Todo, Tsubasa
	CreatorName Suganuma, Ryoya
	CreatorName Fukushima, Ryo
	NRID 1000020198394 1000020198394 CreatorName Narushima, Takayuki
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 CreatorName Nakano, Takayoshi
Subject	Chromium
	Cracking
	Densification
	Laser powder bed fusion
	Texture
Description	Gokcekaya O., Ishimoto T., Todo T., et al. Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion. Crystals, 11, 1, 1. https://doi.org/10.3390/cryst11010009.
Abstract	Processing of pure chromium (Cr) encounters substantial challenges due to its high melting point and intrinsic brittleness. Although laser powder bed fusion processing (LPBF) offers a novel processing approach by reaching the temperature required to melt pure Cr, the high ductile-to-brittle transformation temperature (DBTT) of pure Cr prevents the density of the as-built Cr component from reaching the level of industrial acceptance. This study focuses on raising the quality of the as-built pure Cr components to the industrial level while considering the effect of scan length on densification and crystallographic texture. It was found that short scan length induced by feature size improved the density of as-built specimens while strengthening the texture suggesting uniform heat distribution and lower thermal gradients as a result of short time intervals in scanning tracks and layers. It was discovered that cracking caused by residual stress was detrimental to densification due to the DBTT characteristic of pure Cr, which was localized at high-angle grain boundaries (HAGBs) with high misorientation. The decrease in density and misorientation of HAGBs owing to the increase in grain size and texture strength, respectively, improved the density of as-built Cr up to 97.6% and altered its mechanical properties. Therefore, these findings offer new insight into the LPBF processing of metals with high DBTT characteristics.
Publisher	MDPI
Source Title	Crystals
Volume (Issue)	11(1)
Date of Issued	2020-12-24
Language	English
Handle URL	https://hdl.handle.net/11094/89794
eISSN	20734352
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.3390/cryst11010009
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Crystals. 2020, 11(1)
DC.title	Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion
DC.creator	Gokcekaya, Ozkan
	Ishimoto, Takuya
	Todo, Tsubasa
	Suganuma, Ryoya
	Fukushima, Ryo
	Narushima, Takayuki
	Nakano, Takayoshi
DC.publisher	MDPI
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2020-12-24
DC.identifier	https://doi.org/10.3390/cryst11010009
DC.subject	Chromium
	Cracking
	Densification
	Laser powder bed fusion
	Texture
DC.description	Gokcekaya O., Ishimoto T., Todo T., et al. Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion. Crystals, 11, 1, 1. https://doi.org/10.3390/cryst11010009.
DCTERMS.abstract	Processing of pure chromium (Cr) encounters substantial challenges due to its high melting point and intrinsic brittleness. Although laser powder bed fusion processing (LPBF) offers a novel processing approach by reaching the temperature required to melt pure Cr, the high ductile-to-brittle transformation temperature (DBTT) of pure Cr prevents the density of the as-built Cr component from reaching the level of industrial acceptance. This study focuses on raising the quality of the as-built pure Cr components to the industrial level while considering the effect of scan length on densification and crystallographic texture. It was found that short scan length induced by feature size improved the density of as-built specimens while strengthening the texture suggesting uniform heat distribution and lower thermal gradients as a result of short time intervals in scanning tracks and layers. It was discovered that cracking caused by residual stress was detrimental to densification due to the DBTT characteristic of pure Cr, which was localized at high-angle grain boundaries (HAGBs) with high misorientation. The decrease in density and misorientation of HAGBs owing to the increase in grain size and texture strength, respectively, improved the density of as-built Cr up to 97.6% and altered its mechanical properties. Therefore, these findings offer new insight into the LPBF processing of metals with high DBTT characteristics.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89794
citation_title	Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion
citation_author	Gokcekaya, Ozkan
	Ishimoto, Takuya
	Todo, Tsubasa
	Suganuma, Ryoya
	Fukushima, Ryo
	Narushima, Takayuki
	Nakano, Takayoshi
citation_publisher	MDPI
citation_language	English
citation_date	2020-12-24
citation_journal_title	Crystals
citation_volume	11
citation_issue	1
citation_doi	https://doi.org/10.3390/cryst11010009
citation_public_url	https://hdl.handle.net/11094/89794

Effect of scan length on densification and crystallographic texture formation of pure chromium fabricated by laser powder bed fusion

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