TY - JOUR
T1 - Hydrogenation treatment under several gigapascals assists diffusionless transformation in a face-centered cubic steel
AU - Koyama, Motomichi
AU - Saitoh, Hiroyuki
AU - Sato, Toyoto
AU - Orimo, Shin ichi
AU - Akiyama, Eiji
N1 - Funding Information:
This work was financially supported by JSPS KAKENHI Grants-in-Aid for Scientific Research JP20H02457, and JP18H05513 and JP18H05514 on Innovative Areas “Hydrogenomics”. Synchrotron X-ray radiation experiments at SPring-8 were supported by the QST Advanced Characterization Nanotechnology Platform under the remit of "Nanotechnology Platform" of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (Proposal Nos. JPMXP09A20QS0013 and JPMXP09A21QS0013). The synchrotron radiation experiments were performed using a QST experimental station at QST beamline BL14B1, SPring-8, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2020A3691 and 2021A3691).
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - 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.
AB - 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.
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U2 - 10.1038/s41598-021-98938-1
DO - 10.1038/s41598-021-98938-1
M3 - Article
C2 - 34588585
AN - SCOPUS:85116059307
SN - 2045-2322
VL - 11
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 19384
ER -