Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study

Park, Sung Hyun; Gokcekaya, Ozkan; Nitomakida, Tatsuya; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.jmrt.2024.11.049

Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study

Park, Sung Hyun; Gokcekaya, Ozkan; Nitomakida, Tatsuya et al.

Journal of Materials Research and Technology, 2024, 33, 7333-7344

アクセス数:18件（2025-04-03 22:01 集計）

固定URL: https://hdl.handle.net/11094/99694

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タイトル	Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study
著者	著者名 Park, Sung Hyun
	NRID 1000050988160 1000050988160 ORCID 0000-0002-9258-858X 0000-0002-9258-858X Scopus Author ID 37051975500 37051975500 著者名 Gokcekaya, Ozkan
	著者名 Nitomakida, Tatsuya
	NRID 1000030243182 1000030243182 ORCID 0000-0001-8052-1698 0000-0001-8052-1698 researchmap permalink read0013987 read0013987 Scopus Author ID 7403896013 7403896013 著者名 Nakano, Takayoshi
キーワード等	Chromium
	Densification
	Laser powder bed fusion
	Numerical simulation
	Process-microstructure-property relationship
内容	Park S.H., Gokcekaya O., Nitomakida T., et al. Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study. Journal of Materials Research and Technology 33, 7333 (2024); https://doi.org/10.1016/j.jmrt.2024.11.049.
抄録	The process of employing laser powder bed fusion (L-PBF) process to refractory materials, such as chromium (Cr), remains challenging because of its high ductile-brittle transition temperature. Therefore, a strategy is required to increase the processing temperature to prevent defects. The focus of this study is to clarify the effect of the preheat temperature and scan length variations on defects during the L-PBF process with an experimental and numerical study. Applying a high preheat temperature and short scan length was effective in mitigating the defects. By tuning the heat accumulation strategies, the determined relative density measured by the Archimedes principle and optical measurement of pure Cr parts increased from 97.2% to 99.8% and 97.4% to 99.2%, respectively. The numerical study indicated that deepened and elongated melt pool geometry owing to heat accumulation promoted epitaxial growth. Strong crystallographic texture formation with epitaxial growth led to higher grain size, lower high-angle grain boundary misorientation, Kernel average misorientation, and Taylor factor, which resulted in densification by preventing defects. The hardness of L-PBFed Cr samples gradually decreased with the stronger crystallographic texture formation and compressive yield strength exhibited the same phenomenon. However, the high densification sample with strong crystallographic texture promised the highest compressive strength and strain because it allows single and multi-slip operation during the compressive deformation without premature fracture. This study is a pivotal moment in heat accumulation strategies to achieve high densification for brittle materials fabricated by the L-PBF process while proposing an approach to ensure the reliability of structural applications.
出版者	Elsevier Editora Ltda
収録物名	Journal of Materials Research and Technology
巻(号)	33
ページ	7333-7344
刊行年月	2024-11-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/99694
PISSN	22387854
eISSN	22140697
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.jmrt.2024.11.049
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Journal of Materials Research and Technology. 2024, 33, p. 7333-7344
DC.title	Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study
DC.creator	Park, Sung Hyun
	Gokcekaya, Ozkan
	Nitomakida, Tatsuya
	Nakano, Takayoshi
DC.publisher	Elsevier Editora Ltda
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-11-01
DC.identifier	https://doi.org/10.1016/j.jmrt.2024.11.049
DC.subject	Chromium
	Densification
	Laser powder bed fusion
	Numerical simulation
	Process-microstructure-property relationship
DC.description	Park S.H., Gokcekaya O., Nitomakida T., et al. Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study. Journal of Materials Research and Technology 33, 7333 (2024); https://doi.org/10.1016/j.jmrt.2024.11.049.
DCTERMS.abstract	The process of employing laser powder bed fusion (L-PBF) process to refractory materials, such as chromium (Cr), remains challenging because of its high ductile-brittle transition temperature. Therefore, a strategy is required to increase the processing temperature to prevent defects. The focus of this study is to clarify the effect of the preheat temperature and scan length variations on defects during the L-PBF process with an experimental and numerical study. Applying a high preheat temperature and short scan length was effective in mitigating the defects. By tuning the heat accumulation strategies, the determined relative density measured by the Archimedes principle and optical measurement of pure Cr parts increased from 97.2% to 99.8% and 97.4% to 99.2%, respectively. The numerical study indicated that deepened and elongated melt pool geometry owing to heat accumulation promoted epitaxial growth. Strong crystallographic texture formation with epitaxial growth led to higher grain size, lower high-angle grain boundary misorientation, Kernel average misorientation, and Taylor factor, which resulted in densification by preventing defects. The hardness of L-PBFed Cr samples gradually decreased with the stronger crystallographic texture formation and compressive yield strength exhibited the same phenomenon. However, the high densification sample with strong crystallographic texture promised the highest compressive strength and strain because it allows single and multi-slip operation during the compressive deformation without premature fracture. This study is a pivotal moment in heat accumulation strategies to achieve high densification for brittle materials fabricated by the L-PBF process while proposing an approach to ensure the reliability of structural applications.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	99694
citation_title	Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study
citation_author	Park, Sung Hyun
	Gokcekaya, Ozkan
	Nitomakida, Tatsuya
	Nakano, Takayoshi
citation_publisher	Elsevier Editora Ltda
citation_language	英語
citation_date	2024-11-01
citation_journal_title	Journal of Materials Research and Technology
citation_volume	33
citation_firstpage	7333
citation_lastpage	7344
citation_doi	https://doi.org/10.1016/j.jmrt.2024.11.049
citation_public_url	https://hdl.handle.net/11094/99694

Effects of heat accumulation strategies on defects and microstructure of pure chromium fabricated by laser powder bed fusion: An experimental and numerical study

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