Nucleation of equiaxed δ-ferrite grain by Oxide + TiN to improve tensile properties of ferritic stainless steel welds

Hou, Yuyang; Kadoi, Kota

Materials Characterization, 2025, 227, 115270

Number of Access:5（2025-08-14 12:35 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/102464

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Title
Nucleation of equiaxed δ-ferrite grain by Oxide + TiN to improve tensile properties of ferritic stainless steel welds
Creator
NRID
1000060905933 1000060905933
CreatorName
Hou, Yuyang
NRID
1000040454029 1000040454029
researchmap permalink
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Scopus Author ID
22979603200 22979603200
ORCID
0000-0001-7011-751X 0000-0001-7011-751X
CreatorName
Kadoi, Kota
Subject
CET
Equiaxed grain
Nucleation
Stainless steel
Welding
Description
Hou Y., Kadoi K.. Nucleation of equiaxed δ-ferrite grain by Oxide + TiN to improve tensile properties of ferritic stainless steel welds. Materials Characterization 227, 115270 (2025); https://doi.org/10.1016/j.matchar.2025.115270.
Abstract
This study investigated the tensile properties of ferritic stainless steel welds with Oxide+TiN and the crystal orientation relationship between oxides and TiN. It revealed that the ultimate tensile strength and elongation were improved by 15 % and 50 % in the equiaxed specimen nucleated by Oxide+TiN, respectively. The formation of TiN was accelerated on the oxides Ti₂O₃, Al₂O₃, Al₂Ti₇O₁₅, and MgAl₂O₄ for elucidating the δ-ferrite nucleation. Ti₂O₃ and Al₂O₃ exhibited {0001}oxide // {111}TiN and [1010]oxide // [110]TiN orientations, resulting in misfits of 0.6 % and 8.1 % with TiN, respectively. MgAl₂O₄ was fully parallel to TiN in all crystal orientations and exhibited a misfit of 4.8 % with TiN. Al₂Ti₇O₁₅ was newly discovered as a nucleation site for TiN, attributed to a 3.6 % misfit in the orientation relationships of {204}Al₂Ti₇O₁₅ // {002}TiN, [20−1]Al₂Ti₇O₁₅ // [1−10]TiN, and [020]Al₂Ti₇O₁₅ // [220]TiN. The brittle to ductile transition of the tensile fracture was promoted by formation of equiaxed grain, which greatly random the slip system for larger intragranular deformation.
Publisher
Elsevier Inc.
Source Title
Materials Characterization
Volume (Issue)
227
Page
115270
Date of Issued
2025-06-11
Language
English
Handle URL
https://hdl.handle.net/11094/102464
PISSN
10445803
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.matchar.2025.115270
Access Rights
embargoed access
CopyRight
© 2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/.
The full-text file will be made open to the public on 11 June 2027 in accordance with the publisher's policy.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article