# Grain size effects on strain localization and fracture behavior in ferrite–martensite dual-phase steels characterized by digital image correlation analysis

https://mdr.nims.go.jp/datasets/6bb2267e-7e14-40f7-8d6d-bf662880a60a

## File

- [2025_JMRT_DIC_Park.pdf](https://mdr.nims.go.jp/filesets/2e7c1791-0c28-490c-80be-76e525a90f44/download) ([Detail](https://mdr.nims.go.jp/filesets/2e7c1791-0c28-490c-80be-76e525a90f44.md))

## Id

6bb2267e-7e14-40f7-8d6d-bf662880a60a

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-05T09:49:23.746435Z

## Updated at

2025-12-09T07:30:11.182739Z

## Published at

2025-12-09T03:30:33.410782Z

## Doi



## First published url

https://doi.org/10.1016/j.jmrt.2025.06.165

## Date published

2025-06-23

## Recorded date published

2025-7

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Grain size effects on strain localization and fracture behavior in ferrite–martensite
    dual-phase steels characterized by digital image correlation analysis
  title_type: original
  lang: en

## Description

- description: Dual-phase (DP) steels, consisting of soft ferrite and hard martensite
    phases, are widely utilized for their favorable balance of strength and ductility.
    Grain refinement in DP steels has been recognized as an effective strategy to
    enhance strength without sacrificing ductility, particularly in the post-uniform
    elongation regime. In the present study, the underlying mechanism responsible
    for improved post-uniform elongation through grain refinement was investigated
    using high-resolution digital image correlation (DIC) and detailed microstructural
    analysis of micro-void evolution. Two DP microstructures with ferrite grain sizes
    of 28.9 μm and 11.8 μm were fabricated, exhibiting markedly different local deformation
    behaviors. The fine-grained DP specimen (11.8 μm) exhibited more homogeneous deformation,
    attributed to a greater contribution of martensite to plastic deformation. Numerous
    micro-voids were observed in the fine-grained DP specimen, most of which remained
    small even under large deformation. In contrast, the coarse-grained specimen (28.9
    μm) exhibited fewer micro-voids, several of which showed notable growth, potentially
    acting as fracture initiation sites, and contributing to limited post-uniform
    elongation. DIC analysis at the fracture stage successfully captured the strain
    distribution, revealing that micro-voids and cracks were predominantly located
    in regions with high strain gradients. These observations suggest that grain refinement
    may promote ductility by mitigating strain localization and reducing the propensity
    for void growth.
  description_type: abstract
  lang: und

## Creator

- name: Myeong-heom Park
  role: author
- name: Yuichi Tagusari
  role: author
- name: Akinobu Shibata
  role: author
  orcid: https://orcid.org/0000-0001-8577-6411
  organization: National Institute for Materials Science
- name: Nobuhiro Tsuji
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Dual phase steel
  schema: not_defined
- subject: Mechanical properties
  schema: not_defined
- subject: Digital image correlation (DIC)
  schema: not_defined
- subject: Strain distribution
  schema: not_defined
- subject: Micro void
  schema: not_defined
- subject: Fracture
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Journal of Materials Research and Technology
  issn: '22387854'
  volume: '37'
  start_page: 2258
  end_page: 2270

## Conference



## Related item



## Funding



## Instrument



## Instrument operator



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



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## Fileset

- id: 2e7c1791-0c28-490c-80be-76e525a90f44
  filename: 2025_JMRT_DIC_Park.pdf
  content_type: application/pdf
  size: 18463117
  md5: 89e14bcf35713235b0c5eed7be2f9b6b

## Thumbnail

fileset_id: 2e7c1791-0c28-490c-80be-76e525a90f44
filename: 2025_JMRT_DIC_Park.pdf