# Effect of Bain Unit Size on Low-temperature Fracture Toughness in Medium-carbon Martensitic and Bainitic Steels

https://mdr.nims.go.jp/datasets/449dab19-d5ac-4baf-8660-1dfe8c301426

## File

- [2024_ISIJ_Bain unit.pdf](https://mdr.nims.go.jp/filesets/d463f99a-f54d-4f11-b645-87bb8bae9221/download) ([Detail](https://mdr.nims.go.jp/filesets/d463f99a-f54d-4f11-b645-87bb8bae9221.md))

## Id

449dab19-d5ac-4baf-8660-1dfe8c301426

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-08-09T07:26:24.143937Z

## Updated at

2024-08-19T23:30:40.244193Z

## Published at

2024-08-19T23:30:40.349392Z

## Doi



## First published url

https://doi.org/10.2355/isijinternational.isijint-2023-141

## Date published

2024-01-30

## Recorded date published

2024

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Effect of Bain Unit Size on Low-temperature Fracture Toughness in Medium-carbon
    Martensitic and Bainitic Steels
  title_type: original
  lang: en

## Description

- description: This study investigated the low-temperature fracture toughness of martensite
    and bainite with various Bain unit sizes. The three-point bending tests revealed
    that the apparent fracture toughness increased with decreasing the Bain unit size.
    We also found that even when the carbide size and distribution were almost the
    same, the apparent fracture toughness of tempered martensite with Bain unit size
    of 2.5 um was much higher than that of bainite with Bain unit size of 16.2 um.
    The propagation of micro-crack stopped at the Bain unit boundaries when the Bain
    unit size was small. The additional load was necessary for further propagation
    of crack which stopped at the Bain unit boundaries, leading to the improvement
    of fracture toughness. The critical local fracture toughness corresponding to
    the propagation of crack across the Bain unit boundaries was estimated at 1.04
    MPa m1/2 by finite element simulations. Based on this value, we proposed that
    the Bain unit boundary whose interval was less than 9.4 um could become obstacle
    for the crack propagation after penetrating matrix / carbide boundary.
  description_type: abstract
  lang: und

## Creator

- name: Akinobu Shibata
  role: author
  orcid: https://orcid.org/0000-0001-8577-6411
  organization: National Institute for Materials Science
- name: Tomoyuki Katsuno
  role: author
- name: Mizuki Tsuboi
  role: author
- name: Nobuhiro Tsuji
  role: author

## Contact agent



## Publisher

organization: Iron and Steel Institute of Japan

## Managing organization



## Keyword

- subject: low-temperature embrittlement
  schema: not_defined
- subject: fracture toughness
  schema: not_defined
- subject: cleavage fracture
  schema: not_defined
- subject: bainite
  schema: not_defined
- subject: martensite
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: ISIJ International
  issn: '13475460'
  volume: '64'
  issue: '2'
  start_page: 381
  end_page: 388
  article_number: ISIJINT-2023-141

## Conference



## Related item



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## 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



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## Custom property



## Fileset

- id: d463f99a-f54d-4f11-b645-87bb8bae9221
  filename: 2024_ISIJ_Bain unit.pdf
  content_type: application/pdf
  size: 3443617
  md5: 26f1e04ced3ebad18f2c761f56127ac7

## Thumbnail

fileset_id: d463f99a-f54d-4f11-b645-87bb8bae9221
filename: 2024_ISIJ_Bain unit.pdf