# Effect of Strain Rate on the Extremely Low-Cycle Fatigue of Fe-15Mn-10Cr-8Ni-4Si Bidirectional-TRIP Steel

https://mdr.nims.go.jp/datasets/b58f99a4-d023-45a5-b769-fc864da2204a

## File

- [65_MT-Z2024002.pdf](https://mdr.nims.go.jp/filesets/2bff897a-433a-49ee-8f0e-fcf57e370e9f/download) ([Detail](https://mdr.nims.go.jp/filesets/2bff897a-433a-49ee-8f0e-fcf57e370e9f.md))

## Id

b58f99a4-d023-45a5-b769-fc864da2204a

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-07-24T02:51:18.048434Z

## Updated at

2024-08-02T23:30:22.583061Z

## Published at

2024-08-02T23:30:22.695244Z

## Doi



## First published url

https://doi.org/10.2320/matertrans.mt-z2024002

## Date published

2024-07-01

## Recorded date published

2024

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Effect of Strain Rate on the Extremely Low-Cycle Fatigue of Fe-15Mn-10Cr-8Ni-4Si
    Bidirectional-TRIP Steel
  title_type: original
  lang: en

## Description

- description: Extremely low cycle fatigue tests, up to a total axial strain amplitude
    of 10%, were conducted on Fe-15Mn-10Cr-8Ni-4Si bidirectional transformation-induced
    plasticity (B-TRIP) steel. The fatigue life was approximately five times longer
    than that of SUS316 when the total strain amplitude was 4% or higher. The improved
    fatigue life of Fe-15Mn-10Cr-8Ni-4Si was attributed to reversible bidirectional
    γ ↔ ε transformation during fatigue deformation, which might mitigate fatigue
    damage. In contrast, the fatigue life tended to decrease with increasing strain
    rate when the strain rate was varied from 0.1 to 2.5%/s with a total strain amplitude
    of 10%. Fractography revealed that the fracture surface varied significantly with
    strain rate. At low strain rates, crystallographic fracture surfaces characterized
    by facets and secondary cracks were observed, whereas these features were not
    observed at high strain rates. Electron backscatter diffraction measurements of
    the postmortem microstructure showed that frequent ε-martensite formation occurred
    at low strain rates, whereas martensitic transformation was suppressed at high
    strain rates. The change in the specimen surface temperature was evaluated in
    terms of the Gibbs free energy difference between γ-austenite and ε-martensite
    (i.e., ΔGγ→ε), and the effect of strain rate on the extremely low cycle fatigue
    was discussed from the viewpoint of the deformation mechanism. At a low strain
    rate, the condition for B-TRIP to work effectively, that is, ΔGγ→ε is negative
    but close to zero, was maintained over the entire life span. At a high strain
    rate, the deformation mechanism changed to one in which γ-austenite was dominant
    because of the increase in ΔGγ→ε caused by self-heating; the fatigue damage mitigation
    mechanism provided by B-TRIP was less likely to occur at high strain rates, which
    reduced the fatigue life.
  description_type: abstract
  lang: und

## Creator

- name: Fumiyoshi Yoshinaka
  role: author
  orcid: https://orcid.org/0000-0003-0534-7815
- name: Nobuo Nagashima
  role: author
  orcid: https://orcid.org/0000-0003-3588-980X
- name: Takahiro Sawaguchi
  role: author
  orcid: https://orcid.org/0000-0002-9405-002X

## Contact agent



## Publisher

organization: Japan Institute of Metals

## Managing organization



## Keyword

- subject: fatigue
  schema: not_defined
- subject: fracture surface
  schema: not_defined
- subject: extremely low cycle fatigue
  schema: not_defined
- subject: microstructure
  schema: not_defined
- subject: martensitic transformation
  schema: not_defined
- subject: seismic damper
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: MATERIALS TRANSACTIONS
  issn: '13459678'
  volume: '65'
  issue: '7'
  article_number: MT-Z2024002

## Conference



## Related item



## Funding

- identifier: 19K14853
  funder_name: 日本学術振興会
  description: 疲労損傷のマルチスケール的観察が結びつける転位-塑性変形-き裂関係
- identifier: 23K13227
  funder_name: 日本学術振興会
  description: 可逆双方向TRIPを活用した疲労き裂制御による耐疲労合金創製
- identifier: 20K04170
  funder_name: 日本学術振興会
  description: 大地震を模擬した高速ひずみ速度の極低サイクル繰り返し変形による疲労損傷の解明

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## Fileset

- id: 2bff897a-433a-49ee-8f0e-fcf57e370e9f
  filename: 65_MT-Z2024002.pdf
  content_type: application/pdf
  size: 2746221
  md5: 3055bf336962341974bdfa521d1d39c5

## Thumbnail

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filename: 65_MT-Z2024002.pdf