# Hydrogen-Embrittled Fracture of Dual Phase High-Strength Steel Sheets with Different Microstructural Hardness

https://mdr.nims.go.jp/datasets/a0220b64-d2fb-482f-a7f0-f07e3feb64b1

## File

- [149.pdf](https://mdr.nims.go.jp/filesets/7750d7f0-da76-4afc-9bdb-9f8f375c4e88/download) ([Detail](https://mdr.nims.go.jp/filesets/7750d7f0-da76-4afc-9bdb-9f8f375c4e88.md))

## Id

a0220b64-d2fb-482f-a7f0-f07e3feb64b1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-09T00:37:34.089132Z

## Updated at

2026-01-07T02:05:00.483909Z

## Published at

2026-01-07T03:22:01.004178Z

## Doi

https://doi.org/10.48505/nims.6110

## First published url



## Date published



## Recorded date published



## Resource type

conference_paper

## Manuscript type

na

## Collection



## Title

- title: Hydrogen-Embrittled Fracture of Dual Phase High-Strength Steel Sheets with
    Different Microstructural Hardness
  title_type: original
  lang: en

## Description

- description: 'Advanced-high strength steels (AHSS) have been attracting attention
    in recent years for application to structure parts of automobile to secure both
    crashworthiness and weight reductions. Developing AHSS with excellent resistance
    to hydrogen embrittlement (HE) is an urgent issue since the risk of HE increases
    with increase in a tensile strength of steel due to hydrogen uptake under vehicle
    manufacturing process and market service. The present study aimed to elucidate
    the effect of microstructural hardness on resistance to hydrogen embrittlement
    in ferrite-martensite dual-phase (DP) steel sheet with a tensile strength of approximately
    1180 MPa. Two kinds of DP specimens with similar tensile strength, but different
    microstructural hardness between ferrite and martensite, were prepared: as-quenched
    DP (DP-AQ) and tempered DP (DP-TM) specimens with a high and low difference in
    microstructural hardness, respectively. The resistance to HE of two types of specimens
    was evaluated by using slow strain rate tensile test (SSRT) in-situ a specific
    electrochemical charging with hydrogen, based on the change in the maximum fracture
    strength and uniform elongation obtained by stress-strain curves, and fracture
    strain calculated by the amount of reduction in area. The maximum fracture strength
    was similar among hydrogen-charged two types of specimens. The orders of uniform
    elongation and fracture strain for the hydrogen-charged two types of specimens
    were DP-TM > DP-AQ. The fracture surface of hydrogen-charged DP-AQ specimen was
    mainly quasi-cleavage over the entire fracture surface, however that of DP-TM
    specimen was quasi-cleavage only around the crack initiation site and dimple patterns
    was observed apart from crack initiation area. These results indicate that reduction
    in microstructural hardness between ferrite and martensite improves the HE resistance
    in terms of global and local ductility due to presumably suppressing the hydrogen-related
    crack initiation and crack propagation in brittle mode.'
  description_type: abstract
  lang: eng

## Creator

- name: KEI SAITO
  role: author
  orcid: https://orcid.org/0000-0001-8369-4797
  organization: National Institute for Materials Science
  department: Center for Basic Research on Materials/Data-driven Materials Research
    Field/Materials Modeling Group
- name: MASAHIKO DEMURA
  role: author
  orcid: https://orcid.org/0000-0002-7308-3041
  organization: National Institute for Materials Science
  department: Center for Basic Research on Materials/Data-driven Materials Research
    Field/Materials Modeling Group
- name: KENICHI TAKAI
  role: author
  organization: Sophia University

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## Keyword

- subject: hydrogen embrittlement
  schema: not_defined
- subject: dual phase steel
  schema: not_defined
- subject: hardness
  schema: not_defined
- subject: ductility
  schema: not_defined

## Rights

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

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## Data origin

- data_origin_type: other

## Embargo



## Journal



## Conference

name: 5th International Conference on Metals & Hydrogen
start_date: 2025-10-14
end_date: 2025-10-16
identifier: https://steelyhydrogen.be

## Related item



## Funding

- identifier: JP24K21211
  funder_name: JSPS
  description: 水素脆化破面の局所領域における格子欠陥検出技術の開拓と新たな水素脆化理論への展開

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## Fileset

- id: 7750d7f0-da76-4afc-9bdb-9f8f375c4e88
  filename: 149.pdf
  content_type: application/pdf
  size: 5954636
  md5: 46244789d72d5e317a5f6d9c82a2fa54

## Thumbnail

fileset_id: 7750d7f0-da76-4afc-9bdb-9f8f375c4e88
filename: 149.pdf