# On the Enhanced Creep Performance in Ti6246 Achieved Through Laser Powder Bed Fusion (LPBF) Processing

https://mdr.nims.go.jp/datasets/48ac0e87-9b80-46d0-92b4-dcdb8eb1002b

## File

- [20240730Cobbinah-MMTA.pdf](https://mdr.nims.go.jp/filesets/57d309d9-d59e-4539-914f-9f970ef9b873/download) ([Detail](https://mdr.nims.go.jp/filesets/57d309d9-d59e-4539-914f-9f970ef9b873.md))

## Id

48ac0e87-9b80-46d0-92b4-dcdb8eb1002b

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-06-03T04:16:03.000277Z

## Updated at

2025-06-04T08:16:18.559076Z

## Published at

2026-04-09T23:21:29.801536Z

## Doi

https://doi.org/10.48505/nims.5520

## First published url

https://doi.org/10.1007/s11661-025-07759-8

## Date published

2025-04-10

## Recorded date published

2025-6

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: On the Enhanced Creep Performance in Ti6246 Achieved Through Laser Powder
    Bed Fusion (LPBF) Processing
  title_type: original
  lang: en

## Description

- description: In this study, the creep performance (at 500 °C) of Ti-6Al-2Sn-4Zr-6Mo
    wt.% (Ti6246) fabricated from three different laser powder bed fusion (LPBF) processing
    conditions and heat-treated (HT) at 885 °C were investigated. In the as-built
    state, all the LPBFed-Ti6246 exhibited columnar microstructures with crystallographic
    lamellar-like microstructure (CLM), a near single crystal-like microstructure
    (SCM), and polycrystalline microstructure (PCM) textures, respectively. At low
    applied stresses (100 - 300 MPa), diffusional creep was the dominant deformation
    mechanism and its resistance depended on grain size. The β-forged-HT, characterized
    by large equiaxed grains, exhibited the lowest strain rate compared to the columnar
    microstructure of SX1 (CLM)-HT, SX2 (SCM)-HT, and SX3 (PCM)-HT. Conversely, dislocation
    slip governed deformation at high applied stresses (400 - 580 MPa) and its efficacy
    depended on the α/β interfaces in the microstructures. Compared to SX1 (CLM)-HT,
    SX2 (SCM)-HT, and SX3 (PCM)-HT, the β-forged-HT contained the lowest volume fraction
    of the α phase and hence showcased a large accelerated deformation as creep progressed.
    Disjointed columnar grains in SX1 (CLM)-HT and the deformation of the polycrystalline
    grains in SX3 (PCM)-HT indicated that the melt pool boundaries were unstable in
    the LPBFed-Ti6246. SX2 (SCM)-HT exhibited the longest creep life due to the relatively
    stable melt pool boundaries and the near <001> SCM crystallographic texture parallel
    to the applied stresses. Shallow dimples, cleavage facets, and the observation
    of laser scan tracks characterized the fracture surfaces of SX1 (CLM)-HT, SX2
    (SCM)-HT, and SX3 (PCM)-HT. These indicated that failure occurred by intergranular
    fracture resulting from the formation of creep voids at the melt pool boundaries.
  description_type: abstract
  lang: und

## Creator

- name: Prince Valentine Cobbinah
  role: author
- name: Sae Matsunaga
  role: author
- name: Yoshiaki Toda
  role: author
  orcid: https://orcid.org/0000-0002-8343-2890
- name: Ryosuke Ozasa
  role: author
- name: Takuya Ishimoto
  role: author
- name: Takayoshi Nakano
  role: author
- name: Tsutomu Ito
  role: author
- name: Yoko Yamabe-Mitarai
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Additive manufacturing
  schema: not_defined
- subject: Crystallographic analysis
  schema: not_defined
- subject: Heat-resistant titanium alloys
  schema: not_defined
- subject: Microstructure
  schema: not_defined
- subject: Precipitation
  schema: not_defined
- subject: Volumetric energy density
  schema: not_defined

## Rights

- description: 'This version of the article has been accepted for publication, after
    peer review (when applicable) and is subject to Springer Nature’s AM terms of
    use, but is not the Version of Record and does not reflect post-acceptance improvements,
    or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s11661-025-07759-8'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-04-10
end_date: 2026-04-11

## Journal

- title: Metallurgical and Materials Transactions A
  issn: '10735623'
  volume: '56'
  issue: '6'
  start_page: 2057
  end_page: 2073

## Conference



## Related item



## Funding

- identifier: JP21H05198
  funder_name: Japan Society for the Promotion of Science
  description: Science for Super-Titanium Creation in Super Thermal Field
- identifier: JP23H00235
  funder_name: Japan Society for the Promotion of Science
- funder_name: The Light Metal Educational Foundation

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## Fileset

- id: 57d309d9-d59e-4539-914f-9f970ef9b873
  filename: 20240730Cobbinah-MMTA.pdf
  content_type: application/pdf
  size: 2527596
  md5: ba1e95c26ef6284eabed798d71a87623

## Thumbnail

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filename: 20240730Cobbinah-MMTA.pdf