Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel

Abstract The use of hydrogen in iron and steel has the potential to improve mechanical properties via altering the phase stability and dislocation behavior. When hydrogen is introduced under several gigapascals, a stoichiometric composition of hydrogen can be introduced for steel compositions. In th...

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Autores principales:	Motomichi Koyama, Hiroyuki Saitoh, Toyoto Sato, Shin-ichi Orimo, Eiji Akiyama
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5624a64600344ddbb9c33b28d6558270
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spelling	oai:doaj.org-article:5624a64600344ddbb9c33b28d65582702021-12-02T17:37:35ZHydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel10.1038/s41598-021-98938-12045-2322https://doaj.org/article/5624a64600344ddbb9c33b28d65582702021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98938-1https://doaj.org/toc/2045-2322Abstract The use of hydrogen in iron and steel has the potential to improve mechanical properties via altering the phase stability and dislocation behavior. When hydrogen is introduced under several gigapascals, a stoichiometric composition of hydrogen can be introduced for steel compositions. In this study, a face-centered cubic (fcc) stainless steel was hydrogenated under several gigapascals. When the steel was not hydrogenated, the microstructure after depressurization was an fcc with a hexagonal close-packed (hcp) structure. In contrast, the hydrogenation treatment resulted in a fine lath body-centered cubic (bcc) structure arising from diffusionless transformation. In particular, the bcc phase formed through the following transformation sequence: fcc → hcp → dhcp (double hexagonal close-packed phase) → bcc. That is, the use of hydrogenation treatment realized fine microstructure evolution through a new type of diffusionless transformation sequence, which is expected to be used in future alloy design strategies for developing high-strength steels.Motomichi KoyamaHiroyuki SaitohToyoto SatoShin-ichi OrimoEiji AkiyamaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Motomichi Koyama Hiroyuki Saitoh Toyoto Sato Shin-ichi Orimo Eiji Akiyama Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
description	Abstract The use of hydrogen in iron and steel has the potential to improve mechanical properties via altering the phase stability and dislocation behavior. When hydrogen is introduced under several gigapascals, a stoichiometric composition of hydrogen can be introduced for steel compositions. In this study, a face-centered cubic (fcc) stainless steel was hydrogenated under several gigapascals. When the steel was not hydrogenated, the microstructure after depressurization was an fcc with a hexagonal close-packed (hcp) structure. In contrast, the hydrogenation treatment resulted in a fine lath body-centered cubic (bcc) structure arising from diffusionless transformation. In particular, the bcc phase formed through the following transformation sequence: fcc → hcp → dhcp (double hexagonal close-packed phase) → bcc. That is, the use of hydrogenation treatment realized fine microstructure evolution through a new type of diffusionless transformation sequence, which is expected to be used in future alloy design strategies for developing high-strength steels.
format	article
author	Motomichi Koyama Hiroyuki Saitoh Toyoto Sato Shin-ichi Orimo Eiji Akiyama
author_facet	Motomichi Koyama Hiroyuki Saitoh Toyoto Sato Shin-ichi Orimo Eiji Akiyama
author_sort	Motomichi Koyama
title	Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
title_short	Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
title_full	Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
title_fullStr	Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
title_full_unstemmed	Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
title_sort	hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5624a64600344ddbb9c33b28d6558270
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Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel

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