Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy

Gokcekaya, Ozkan; Ishimoto, Takuya; Hibino, Shinya; Yasutomi, Jumpei; Narushima, Takayuki; Nakano, Takayoshi

doi:https://doi.org/10.1016/j.actamat.2021.116876

Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy

Gokcekaya, Ozkan; Ishimoto, Takuya; Hibino, Shinya et al.

Acta Materialia, 2021, 212, 116876

アクセス数:182件（2025-04-03 21:23 集計）

固定URL: https://hdl.handle.net/11094/89781

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タイトル	Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy
著者	著者名 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 著者名 Ishimoto, Takuya
	著者名 Hibino, Shinya
	著者名 Yasutomi, Jumpei
	NRID 1000020198394 1000020198394 著者名 Narushima, Takayuki
	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	Crystallographic texture
	Inconel 718
	Lamellae
	Laser powder bed fusion
	Mechanical anisotropy
内容	Gokcekaya O., Ishimoto T., Hibino S., et al. Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy. Acta Materialia, 212, 116876. https://doi.org/10.1016/j.actamat.2021.116876.
抄録	Additive manufacturing offers an exclusive way of anisotropic microstructure control with a high degree of freedom regarding variation in process parameters. This study demonstrates a unique texture formation in Inconel 718 (IN718) using a bidirectional laser scan in a laser powder bed fusion (LPBF) process for tailoring the mechanical properties. We developed three distinctive textures in IN718 using LPBF: a single-crystal-like microstructure (SCM) with a <110> orientation in the build direction (BD), crystallographic lamellar microstructure (CLM) with a <110>-oriented main layer and <100>-oriented sub-layer in the BD, and polycrystalline with a weak orientation. The microstructure observations and finite element simulations showed that the texture evolution of the SCM and CLM was dominated by the melt-pool shape and related heat-flow direction. The specimen with CLM exhibited a simultaneous improvement in strength and ductility owing to the stress-transfer coefficient between the <110>-oriented main and <100>-oriented sub-grains, showing superior mechanical properties compared to cast-IN718. This behavior is largely attributed to the presence of the boundary between the main and sub-layers (crystallographic grain boundary) lying parallel to the BD uniquely formed under the LPBF process. Furthermore, the strength–ductility balance of the part with the CLM can be controlled by changing the stress-transfer coefficient and the Schmidt factor through an alteration of the loading axis. Control of the crystallographic texture, including the CLM formation, is beneficial for tailoring and improving the mechanical performance of the structural materials, which can be a promising methodology.
出版者	Acta Materialia Inc.
収録物名	Acta Materialia
巻(号)	212
ページ	116876
刊行年月	2021-06-15
言語	英語
ハンドルURL	https://hdl.handle.net/11094/89781
PISSN	13596454
NCID	AA1106787X
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.actamat.2021.116876
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
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Acta Materialia. 2021, 212, p. 116876
DC.title	Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy
DC.creator	Gokcekaya, Ozkan
	Ishimoto, Takuya
	Hibino, Shinya
	Yasutomi, Jumpei
	Narushima, Takayuki
	Nakano, Takayoshi
DC.publisher	Acta Materialia Inc.
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-06-15
DC.identifier	https://doi.org/10.1016/j.actamat.2021.116876
DC.subject	Crystallographic texture
	Inconel 718
	Lamellae
	Laser powder bed fusion
	Mechanical anisotropy
DC.description	Gokcekaya O., Ishimoto T., Hibino S., et al. Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy. Acta Materialia, 212, 116876. https://doi.org/10.1016/j.actamat.2021.116876.
DCTERMS.abstract	Additive manufacturing offers an exclusive way of anisotropic microstructure control with a high degree of freedom regarding variation in process parameters. This study demonstrates a unique texture formation in Inconel 718 (IN718) using a bidirectional laser scan in a laser powder bed fusion (LPBF) process for tailoring the mechanical properties. We developed three distinctive textures in IN718 using LPBF: a single-crystal-like microstructure (SCM) with a <110> orientation in the build direction (BD), crystallographic lamellar microstructure (CLM) with a <110>-oriented main layer and <100>-oriented sub-layer in the BD, and polycrystalline with a weak orientation. The microstructure observations and finite element simulations showed that the texture evolution of the SCM and CLM was dominated by the melt-pool shape and related heat-flow direction. The specimen with CLM exhibited a simultaneous improvement in strength and ductility owing to the stress-transfer coefficient between the <110>-oriented main and <100>-oriented sub-grains, showing superior mechanical properties compared to cast-IN718. This behavior is largely attributed to the presence of the boundary between the main and sub-layers (crystallographic grain boundary) lying parallel to the BD uniquely formed under the LPBF process. Furthermore, the strength–ductility balance of the part with the CLM can be controlled by changing the stress-transfer coefficient and the Schmidt factor through an alteration of the loading axis. Control of the crystallographic texture, including the CLM formation, is beneficial for tailoring and improving the mechanical performance of the structural materials, which can be a promising methodology.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	89781
citation_title	Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy
citation_author	Gokcekaya, Ozkan
	Ishimoto, Takuya
	Hibino, Shinya
	Yasutomi, Jumpei
	Narushima, Takayuki
	Nakano, Takayoshi
citation_publisher	Acta Materialia Inc.
citation_language	英語
citation_date	2021-06-15
citation_journal_title	Acta Materialia
citation_volume	212
citation_firstpage	116876
citation_doi	https://doi.org/10.1016/j.actamat.2021.116876
citation_public_url	https://hdl.handle.net/11094/89781

Unique crystallographic texture formation in Inconel 718 by laser powder bed fusion and its effect on mechanical anisotropy

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