Surface residual stress and phase stability in unstable β-type Ti–15Mo–5Zr–3Al alloy manufactured by laser and electron beam powder bed fusion technologies

Takase, Aya; Ishimoto, Takuya; Suganuma, Ryoya et al.

Additive Manufacturing, 2021, 47, 102257

Number of Access:435（2025-07-18 09:46 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/89766

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Title
Surface residual stress and phase stability in unstable β-type Ti–15Mo–5Zr–3Al alloy manufactured by laser and electron beam powder bed fusion technologies
Creator
CreatorName
Takase, Aya
NRID
1000050508835 1000050508835
ORCID
0000-0003-0081-0591 0000-0003-0081-0591
researchmap permalink
i_taku i_taku
Scopus Author ID
35310484700 35310484700
CreatorName
Ishimoto, Takuya
CreatorName
Suganuma, Ryoya
NRID
1000030243182 1000030243182
ORCID
0000-0001-8052-1698 0000-0001-8052-1698
researchmap permalink
read0013987 read0013987
Scopus Author ID
7403896013 7403896013
CreatorName
Nakano, Takayoshi
Subject
Phase stability
Powder bed fusion
Residual stress
Thermal history
Titanium alloys
Description
Takase A., Ishimoto T., Suganuma R., et al. Surface residual stress and phase stability in unstable β-type Ti–15Mo–5Zr–3Al alloy manufactured by laser and electron beam powder bed fusion technologies. Additive Manufacturing, 47, 102257. https://doi.org/10.1016/j.addma.2021.102257.
Abstract
The differences between the physicochemical properties of the laser and electron beam powder bed fusion (L- and EB-PBF) methods are yet to be explored further. In particular, the differences in the residual stress and phase stability of alloys with unstable phases remain unexplored. The present work is the first to systematically investigate how the heat source type and process parameters affect the surface residual stress and phase stability of an unstable β-type titanium alloy, Ti–15Mo–5Zr–3Al. The surface residual stress and β-phase behavior were studied using high-precision X-ray diffraction (HP-XRD). Significant differences were observed between the two methods. The L-PBF-made specimens exhibited tensile residual stresses of up to 400 MPa in the surface area. HP-XRD analysis revealed a stress-induced lattice distortion, interpreted as a transitional state between the β-phase and α”-phase. In contrast, the EB-PBF-made specimens showed no significant residual stress and had an undistorted β-phase coexisting with the hexagonal α-phase caused by elemental partitioning. This study provides new insights into the previously neglected effects of L-PBF and EB-PBF in unstable β-type titanium alloys.
Publisher
Elsevier
Source Title
Additive Manufacturing
Volume (Issue)
47
Page
102257
Date of Issued
2021-11-01
Language
English
Handle URL
https://hdl.handle.net/11094/89766
eISSN
22148604
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.addma.2021.102257
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
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Category
学術雑誌論文 Journal Article