# Anomalous grain growth as a pathway toward fully single-crystallization in IN738LC Ni-based superalloy fabricated by laser powder bed fusion

https://mdr.nims.go.jp/datasets/a335beef-c4c3-4915-8fda-a3c3181ed9c7

## File

- [1-s2.0-S0264127526007951-main.pdf](https://mdr.nims.go.jp/filesets/2afdbbf5-1a89-43d3-bcde-1c973013b7e0/download) ([Detail](https://mdr.nims.go.jp/filesets/2afdbbf5-1a89-43d3-bcde-1c973013b7e0.md))

## Id

a335beef-c4c3-4915-8fda-a3c3181ed9c7

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-07-13T08:13:17.200081Z

## Updated at

2026-07-14T01:31:33.981443Z

## Published at

2026-07-14T03:30:12.246209Z

## Doi



## First published url

https://doi.org/10.1016/j.matdes.2026.116222

## Date published

2026-05-14

## Recorded date published

2026-6

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Anomalous grain growth as a pathway toward fully single-crystallization in
    IN738LC Ni-based superalloy fabricated by laser powder bed fusion
  title_type: original
  lang: en

## Description

- description: 'This study demonstrates that a single crystal (SX) of the IN738LC
    Ni-based superalloy can be fabricated via laser powder bed fusion (PBF-LB) and
    the quality of the built SX part can be improved via optimal thermal annealing.
    The as-fabricated part exhibits inhomogeneities in crystal orientation: the central
    area is a single crystal, whereas the edges are polycrystalline. The crystal orientation
    of the single-crystal region is largely affected by gas flow during the build,
    which could be detected by the in-process melt pool monitoring system. Additionally,
    significant solute-element segregation is observed in the microstructure of the
    single-crystal region, consistent with the distribution predicted by the multi-phase-field
    simulation. Notably, we found that anomalous grain growth, induced by optimal
    annealing at 1200 ◦C, selectively expands the SX region while eliminating solute-element
    segregation, thereby improving the overall quality of the single-crystal part.
    These findings provide insight into the development of single-crystal fabrication
    via the PBF-LB process for aerospace and energy applications.'
  description_type: abstract
  lang: und

## Creator

- name: Masayuki Okugawa
  role: author
- name: Kazufumi Nose
  role: author
- name: Sei Hirooka
  role: author
- name: Sukeharu Nomoto
  role: author
  orcid: https://orcid.org/0000-0001-6503-4699
  organization: National Institute for Materials Science
- name: Yuheng Liu
  role: author
- name: Makoto Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-5064-9583
  organization: National Institute for Materials Science
- name: Yuichiro Koizumi
  role: author
- name: Takayoshi Nakano
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Additive manufacturing
  schema: not_defined
- subject: Laser powder bed fusion
  schema: not_defined
- subject: Ni-based superalloy
  schema: not_defined
- subject: Single-crystal fabrication
  schema: not_defined
- subject: μ-Helix scan
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc/4.0/
  date_licensed: 2026-05-13

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Materials & Design
  issn: '02641275'
  volume: '266'
  article_number: '116222'

## Conference



## Related item



## Funding

- funder_name: Japan Science and Technology Agency
- identifier: 21H05193
  funder_name: Japan Society for the Promotion of Science
- identifier: 21H05018
  funder_name: Japan Society for the Promotion of Science
- funder_name: Cabinet Office, Government of Japan
- identifier: JPMJCR2194
  funder_name: Core Research for Evolutional Science and Technology

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 2afdbbf5-1a89-43d3-bcde-1c973013b7e0
  filename: 1-s2.0-S0264127526007951-main.pdf
  content_type: application/pdf
  size: 14864941
  md5: 5a396a97e31d16186fd73f7423fb9472

## Thumbnail

fileset_id: 2afdbbf5-1a89-43d3-bcde-1c973013b7e0
filename: 1-s2.0-S0264127526007951-main.pdf