# Mechanism of simultaneous increase of strength and ductility with grain refinement in Si-added high-Mn austenitic steel

https://mdr.nims.go.jp/datasets/a95e36d0-34c9-4061-8dd5-fb0afb2abb68

## File

- [MSEA-D-23-05197_R1_MDR.pdf](https://mdr.nims.go.jp/filesets/c705e96d-5431-4135-ad9a-5ecad73b6392/download) ([Detail](https://mdr.nims.go.jp/filesets/c705e96d-5431-4135-ad9a-5ecad73b6392.md))

## Id

a95e36d0-34c9-4061-8dd5-fb0afb2abb68

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-02T02:54:38.621074Z

## Updated at

2026-02-03T03:30:15.547978Z

## Published at

2026-02-03T00:46:29.601876Z

## Doi

https://doi.org/10.48505/nims.4917

## First published url

https://doi.org/10.1016/j.msea.2024.146193

## Date published

2024-02-03

## Recorded date published

2024-3

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Mechanism of simultaneous increase of strength and ductility with grain refinement
    in Si-added high-Mn austenitic steel
  title_type: original
  lang: en

## Description

- description: We systematically investigated the effect of grain refinement on mechanical
    properties and fracture behavior of Si-added high-Mn austenitic steel. A 22Mn-0.6C–3Si
    steel (wt. %) with single-phase FCC structure was investigated in the present
    study. By applying high pressure torsion (HPT) and subsequent annealing process,
    specimens with fully recrystallized microstructures having various mean grain
    sizes ranging from 0.9 μm to 113 μm were obtained. The present steel exhibited
    a unique mechanical behavior that both strength and ductility simultaneously improved
    with grain refinement. Coarse-grained (dmean = 113 μm) and medium-grained (dmean
    = 13 μm) specimens fractured before reaching the plastic instability condition,
    whereas ultrafine-grained specimen (dmean = 0.9 μm) fractured after satisfying
    the plastic instability condition. Deformation microstructures of tensile fractured
    specimens were investigated by using EBSD phase map. Obtained results revealed
    that the fraction of deformation induced ε-martensite significantly decreased
    with the grain refinement. At the same time, fracture surfaces of the different
    grain-sized specimens showed that the fraction of the fracture surfaces having
    step-like ridge pattern decreased with the grain refinement. Micro-cracks were
    observed to characterize a crack initiation site, and it was found that micro-cracks
    formed and propagated along the prior austenite grain boundaries where ε-martensite
    impinged. By applying the fracture surface topography analysis (FRASTA) to the
    tensile-fractured specimens, it was revealed that the crack initiated from the
    step-like ridge pattern, where each step was considered to be ε-martensite plate.
    The results consistently suggested that the step-like ridge pattern was grain
    boundary fracture surface related to ε-martensite, and grain refinement suppressed
    the ε-martensitic transformation and avoid the fracture before reaching the plastic
    instability condition, leading to the enhanced ductility as well as the high strength.
  description_type: abstract
  lang: und

## Creator

- name: Sukyoung Hwang
  role: author
- name: Yu Bai
  role: author
- name: Si Gao
  role: author
- 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
  ror: https://ror.org/026v1ze26
- name: Nobuhiro Tsuji
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: high-Mn austenitic steel
  schema: not_defined
- subject: Si addition
  schema: not_defined
- subject: grain refinement
  schema: not_defined
- subject: ε-martensitic transformation
  schema: not_defined
- subject: fracture surface topography analysis (FRASTA)
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-02-03
end_date: 2026-02-03

## Journal

- title: 'Materials Science and Engineering: A'
  issn: '09215093'
  volume: '894'
  article_number: '146193'

## Conference



## Related item



## Funding

- funder_name: Japan Society for the Promotion of Science
- funder_name: Japan Science and Technology Agency

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



## Computational method



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## Fileset

- id: c705e96d-5431-4135-ad9a-5ecad73b6392
  filename: MSEA-D-23-05197_R1_MDR.pdf
  content_type: application/pdf
  size: 3559670
  md5: ba440e2ad02cfa0888f8b0c291a77d1b

## Thumbnail

fileset_id: c705e96d-5431-4135-ad9a-5ecad73b6392
filename: MSEA-D-23-05197_R1_MDR.pdf