# Grain refinement of dual phase steel maximizes deformation ability of martensite, leading to simultaneous enhancement of strength and ductility

https://mdr.nims.go.jp/datasets/97be982e-9c3f-4d16-8163-a23598c40518

## File

- [2025_Acta_(Myeongheom_DIC).pdf](https://mdr.nims.go.jp/filesets/094f9af4-abc8-4bf0-b303-5d733a27e876/download) ([Detail](https://mdr.nims.go.jp/filesets/094f9af4-abc8-4bf0-b303-5d733a27e876.md))

## Id

97be982e-9c3f-4d16-8163-a23598c40518

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-05T09:51:31.604792Z

## Updated at

2025-12-09T07:30:13.737994Z

## Published at

2025-12-09T03:30:33.572489Z

## Doi



## First published url

https://doi.org/10.1016/j.actamat.2025.121061

## Date published

2025-04-16

## Recorded date published

2025-6

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Grain refinement of dual phase steel maximizes deformation ability of martensite,
    leading to simultaneous enhancement of strength and ductility
  title_type: original
  lang: en

## Description

- description: Dual-phase (DP) steel, composed of soft ferrite and hard martensite,
    is well-known advanced high-strength steel (AHSS) because of its exceptional strength-ductility
    balance and low manufacturing cost. The present study found that microstructural
    refinement of DP steel enhanced not only its yield strength but also strain-hardening,
    leading to increasing both strength and ductility. Digital image correlation (DIC)
    analysis showed that strains were localized much more in soft ferrite than in
    hard martensite but the refinement of DP structure decreased the difference in
    average strains of ferrite and martensite, which avoided crack initiation in ferrite
    and led to large ductility. Consequently, the refinement of DP structure induced
    more plastic deformation in martensite through enhanced deformation constraints
    by the increase in ferrite/martensite interfaces. In-situ neutron diffraction
    experiment during tensile deformation quantitatively showed that higher phase
    stress was borne in hard martensite than in soft ferrite and microstructure refinement
    made martensite bear higher phase stress through the enhanced deformation constraint.
    Using strain/stress-partitioning results obtained by μ-DIC and in-situ neutron
    diffraction, individual stress-strain curves of ferrite and martensite could be
    successfully constructed for the first time. Individual stress-strain curves of
    ferrite and martensite reasonably explained the strength-ductility synergy in
    the fine-grained DP structure in terms of deformation constraint between two phases.
    Microstructure refinement in DP structures enhanced deformation constraint between
    two phases to maximize the deformation ability of martensite. The insight obtained
    in the present study could be applied to general heterostructured materials composed
    of soft and hard domains for overcoming the strength-ductility trade-off relationship.
  description_type: abstract
  lang: und

## Creator

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

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Strength-ductility synergy
  schema: not_defined
- subject: Strain-hardening
  schema: not_defined
- subject: Stress/strain partitioning
  schema: not_defined
- subject: Deformation constraint
  schema: not_defined
- subject: Digital image correlation (DIC)
  schema: not_defined
- subject: In-situ neutron diffraction during deformation
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Acta Materialia
  issn: '13596454'
  volume: '292'
  article_number: '121061'

## Conference



## Related item



## Funding

- identifier: JP22K18888
  funder_name: Japan Society for the Promotion of Science
- identifier: JP20K14608
  funder_name: Japan Society for the Promotion of Science
- identifier: JP23K20037
  funder_name: Japan Society for the Promotion of Science
- identifier: JP24K07214
  funder_name: Japan Society for the Promotion of Science
- identifier: JP23H00234
  funder_name: Japan Society for the Promotion of Science
- identifier: 2018B0150
  funder_name: Kyoto University
- funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: JPMJCR1994
  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: '094f9af4-abc8-4bf0-b303-5d733a27e876'
  filename: 2025_Acta_(Myeongheom_DIC).pdf
  content_type: application/pdf
  size: 12143945
  md5: ee7830b7f43f22b82e8deb13a86a4c4a

## Thumbnail

fileset_id: '094f9af4-abc8-4bf0-b303-5d733a27e876'
filename: 2025_Acta_(Myeongheom_DIC).pdf