# Investigation of the Process Optimization for L-PBF Hastelloy X Alloy on Microstructure and Mechanical Properties

https://mdr.nims.go.jp/datasets/c589bc9c-f258-497a-9c09-5cc6694d735d

## File

- [materials-18-01890-v2.pdf](https://mdr.nims.go.jp/filesets/d7fa0b16-4fd1-4a6a-af31-eee1bd503f67/download) ([Detail](https://mdr.nims.go.jp/filesets/d7fa0b16-4fd1-4a6a-af31-eee1bd503f67.md))

## Id

c589bc9c-f258-497a-9c09-5cc6694d735d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-04-22T08:01:41.213884Z

## Updated at

2025-04-23T03:30:07.984507Z

## Published at

2025-04-23T03:17:47.108270Z

## Doi



## First published url

https://doi.org/10.3390/ma18081890

## Date published

2025-04-21

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Investigation of the Process Optimization for L-PBF Hastelloy X Alloy on
    Microstructure and Mechanical Properties
  title_type: original
  lang: en

## Description

- description: The purpose of this study is to investigate the effects of process
    parameters on the mi-crostructure and mechanical properties of the Hastelloy X
    (HX) alloy using a laser powder bed fusion (L-PBF) process. A combined experimental
    and numerical approach was used to evaluate the influence of the energy density
    distribution and temperature evolution on the microstructure, defects, and mechanical
    properties. After the specimens were built on SUS304 substrate by the L-PBF, the
    microstructure and defects in the specimens were analyzed by SEM and EBSD analysis
    methods, and then the hardness and the tensile tests were performed. The cooling
    rate under different laser conditions was obtained by the finite element method
    (FEM). The results show that a low volume energy density (VED) was applied to
    the unmelted powder particles, and a high energy density resulted in spherical
    defects. In addition, the microstructures were found to coarsen with increasing
    the energy density along with a tendency to strengthen the (001) texture orientation
    in both xy and xz planes. Compared to the parts with the thermal history from
    numerical results, the low cooling rate with high energy density had larger crystal
    grains elongated along the building direction, coarser sub-grains, resulting in
    a reduction of microhardness and yield strength together with an increase in elongation
    for the L-PBF HX alloy. The presented results provide new insight into the effect
    of parameters and the cooling rates. It can play an important role in optimizing
    the L-PBF processing parameters, identifying the cause of defects, and controlling
    the cooling rates for the crystallographic texture in such a way as to guide the
    development of better metrics for designing processing pa-rameters with the desired
    mechanical properties.
  description_type: abstract
  lang: und

## Creator

- name: Phuangphaga Daram
  role: author
  orcid: https://orcid.org/0000-0001-8937-6319
  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: Makoto Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-5064-9583
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: MDPI AG

## Managing organization



## Keyword

- subject: laser powder bed fusion process
  schema: not_defined
- subject: Hastelloy X alloy
  schema: not_defined
- subject: microstructure
  schema: not_defined
- subject: mechanical properties
  schema: not_defined
- subject: FEM analysis
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Materials
  issn: '19961944'
  volume: '18'
  issue: '8'
  article_number: '1890'

## Conference



## Related item



## Funding

- identifier: JPJ004596
  funder_name: Acquisition, Technology & Logistics Agency
- identifier: AF-2022201
  funder_name: The Amada Foundation

## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Specific property for specimen



## Process for specimen treatment



## Computational method



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## Fileset

- id: d7fa0b16-4fd1-4a6a-af31-eee1bd503f67
  filename: materials-18-01890-v2.pdf
  content_type: application/pdf
  size: 5980687
  md5: 6892d3838c16a3257f9c11ab3f19dea2

## Thumbnail

fileset_id: d7fa0b16-4fd1-4a6a-af31-eee1bd503f67
filename: materials-18-01890-v2.pdf