# External and Internal Cracking Caused by Heat Treatment in Laser Powder Bed Fusion‐Fabricated Inconel 738LC Components

https://mdr.nims.go.jp/datasets/b03bb277-f923-4929-abe0-5677ec689863

## File

- [Adv Eng Mater - 2026 - Kuwabara - External and Internal Cracking Caused by Heat Treatment in Laser Powder Bed.pdf](https://mdr.nims.go.jp/filesets/0a9c06b5-9073-4023-a2bb-3f2c65e0df1c/download) ([Detail](https://mdr.nims.go.jp/filesets/0a9c06b5-9073-4023-a2bb-3f2c65e0df1c.md))

## Id

b03bb277-f923-4929-abe0-5677ec689863

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-09-28T23:52:18.790265Z

## Updated at

2026-09-29T00:49:58.506113Z

## Published at

2026-09-29T03:38:35.470938Z

## Doi



## First published url

https://doi.org/10.1002/adem.71079

## Date published

2026-09-23

## Recorded date published

2026-9-23

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: External and Internal Cracking Caused by Heat Treatment in Laser Powder Bed
    Fusion‐Fabricated Inconel 738LC Components
  title_type: original
  lang: en

## Description

- description: ニッケル基耐熱超合金Inconel 738LCのレーザ粉末積層造形体において熱処理時に発生する割れ現象を調査した。熱処理時に発生する割れは昇温中に造形体の上下面から発生する外部割れと、造形体内部のガス空隙や凝固割れに起因して発生する内部割れとに分類できる事を明らかにした。内部割れについて熱処理温度に対する割れの数や長さの依存性が見られ、造形時の内部応力の緩和や内部析出に伴う新たな応力の発生、さらに高温条件では結晶粒界に沿う液化割れなどが内部割れに影響する事が確認された。何れの割れも積層造形時に発生する残留応力や内部欠陥がその発生機構に関わり、内部欠陥を抑止した積層造形体において外部割れ、内部割れの両方の熱処理割れを防止できることを実証した。
  description_type: abstract
  lang: und

## Creator

- name: Kosuke Kuwabara
  role: author
  orcid: https://orcid.org/0000-0002-9326-4579
  organization: National Institute for Materials Science
- name: Masahiro Kusano
  role: author
  orcid: https://orcid.org/0000-0002-5061-0195
  organization: National Institute for Materials Science
- name: Ayako Ikeda
  role: author
  orcid: https://orcid.org/0000-0002-1705-9004
  organization: National Institute for Materials Science
- name: Toshio Osada
  role: author
  orcid: https://orcid.org/0000-0003-1539-9264
  organization: National Institute for Materials Science
- name: Makoto Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-5064-9583
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: superalloy
  schema: not_defined
- subject: nickel
  schema: not_defined
- subject: Inconel 738LC
  schema: not_defined
- subject: laser powder bed fusion
  schema: not_defined
- subject: heat treatment
  schema: not_defined
- subject: crack
  schema: not_defined
- subject: grain boundaries
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/
  date_licensed: 2026-07-19

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: ADVANCED ENGINEERING MATERIALS
  issn: '15272648'
  volume: '28'
  issue: '18'

## Conference



## Related item



## Funding

- identifier: AF-2022201-A3
  funder_name: 天田財団
  description: レーザ積層造形Ni基超合金の延性低下割れ挙動の定量評価および割れ特性改善の試み

## 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: 0a9c06b5-9073-4023-a2bb-3f2c65e0df1c
  filename: Adv Eng Mater - 2026 - Kuwabara - External and Internal Cracking Caused
    by Heat Treatment in Laser Powder Bed.pdf
  content_type: application/pdf
  size: 8781713
  md5: 63659c6d176cc98bd8e9e41afaf5af83

## Thumbnail

fileset_id: 0a9c06b5-9073-4023-a2bb-3f2c65e0df1c
filename: Adv Eng Mater - 2026 - Kuwabara - External and Internal Cracking Caused
  by Heat Treatment in Laser Powder Bed.pdf