# Fatigue Limit Doubling in High‐Strength Martensitic Steel through Crack Embryo Engineering–Cyclic‐Training‐Driven Self‐Optimization

https://mdr.nims.go.jp/datasets/5c55ac6f-2b75-41d3-92f5-216fcfd1c891

## File

- [Advanced Science - 2025 - Okada - Fatigue Limit Doubling in High‐Strength Martensitic Steel through Crack Embryo.pdf](https://mdr.nims.go.jp/filesets/79105349-0a56-4ebd-8238-cc04fb6f7f8a/download) ([Detail](https://mdr.nims.go.jp/filesets/79105349-0a56-4ebd-8238-cc04fb6f7f8a.md))

## Id

5c55ac6f-2b75-41d3-92f5-216fcfd1c891

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-11T00:25:34.078810Z

## Updated at

2025-11-11T07:30:06.535656Z

## Published at

2025-11-11T07:24:13.022934Z

## Doi



## First published url

https://doi.org/10.1002/advs.202504165

## Date published

2025-06-29

## Recorded date published

2025-9

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Fatigue Limit Doubling in High‐Strength Martensitic Steel through Crack Embryo
    Engineering–Cyclic‐Training‐Driven Self‐Optimization
  title_type: original
  lang: en

## Description

- description: 'Achieving superior fracture resistance under cyclic loading–specifically,
    a high-fatigue limit–is crucial for ensuring structural safety and supporting
    a sustainable society. This study demonstrates a breakthrough in overcoming the
    conventional fatigue limit ceiling in high-strength as-quenched martensitic steel
    by enhancing resistance to crack initiation. In the as-heat-treated state, high-angle
    boundaries with large elastic misfits and plastic incompatibility served as precursory
    sites for intrusions/extrusions (these are defined as “crack embryos”), eventually
    leading to fatigue crack initiation. Remarkably, after the pre-fatigue training,
    surface crack initiation is entirely suppressed, doubling the fatigue limit with
    minimal change in tensile strength. A novel concept of “crack embryo engineering”
    is introduced, which targets the prevention of crack embryo formation by extracting
    intrinsic microstructural self-optimization against fatigue deformation: macroscopic
    hardness homogenization and selective nano-hardening of the precursory sites.
    This self-optimization strategy offers a versatile approach to improving fatigue
    limit in general steels, providing an effective alternative to tempering heat
    treatment that inevitably sacrifices tensile strength.'
  description_type: abstract
  lang: und

## Creator

- name: Kazuho Okada
  role: author
  orcid: https://orcid.org/0000-0003-0183-4528
  organization: National Institute for Materials Science
- name: Kaneaki Tsuzaki
  role: author
  orcid: https://orcid.org/0000-0003-2400-7605
  organization: National Institute for Materials Science
- name: Eri Nakagawa
  role: author
  orcid: https://orcid.org/0000-0002-8784-0138
  organization: National Institute for Materials Science
- name: Akinobu Shibata
  role: author
  orcid: https://orcid.org/0000-0001-8577-6411
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Wiley

## Managing organization



## Keyword

- subject: マルテンサイト鋼
  schema: not_defined
- subject: 疲労限度
  schema: not_defined
- subject: き裂発生
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Advanced Science
  issn: '21983844'
  volume: '12'
  issue: '33'
  article_number: e04165

## Conference



## Related item



## Funding

- identifier: JPMJAX23D5
  funder_name: Japan Science and Technology Agency
- identifier: JP23K13541
  funder_name: Japan Society for the Promotion of Science
- identifier: JP23K26410
  funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Process for specimen treatment



## Computational method



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## Fileset

- id: 79105349-0a56-4ebd-8238-cc04fb6f7f8a
  filename: Advanced Science - 2025 - Okada - Fatigue Limit Doubling in High‐Strength
    Martensitic Steel through Crack Embryo.pdf
  content_type: application/pdf
  size: 3383131
  md5: 99423eee2393b34a3b1176d435821c22

## Thumbnail

fileset_id: 79105349-0a56-4ebd-8238-cc04fb6f7f8a
filename: Advanced Science - 2025 - Okada - Fatigue Limit Doubling in High‐Strength
  Martensitic Steel through Crack Embryo.pdf