# Analysis of Nano-hardness Distribution Near the Ferrite-martensite Interface in a Dual Phase Steel with Factorization of Its Scattering Behavior

https://mdr.nims.go.jp/datasets/edcbc4a0-4398-4306-ab4f-a7f1035bae94

## File

- [ando_ISIJINT2021.pdf](https://mdr.nims.go.jp/filesets/3de4ff15-1573-4e05-aa6a-0a27657639e7/download) ([Detail](https://mdr.nims.go.jp/filesets/3de4ff15-1573-4e05-aa6a-0a27657639e7.md))

## Id

edcbc4a0-4398-4306-ab4f-a7f1035bae94

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2023-02-22T06:38:36.114769Z

## Updated at

2024-01-05T13:13:56.021749Z

## Published at

2023-02-28T02:55:09.526376Z

## Doi



## First published url

https://doi.org/10.2355/isijinternational.ISIJINT-2020-546

## Date published

2021-01-15

## Recorded date published

2021

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Analysis of Nano-hardness Distribution Near the Ferrite-martensite Interface
    in a Dual Phase Steel with Factorization of Its Scattering Behavior
  title_type: original
  lang: en

## Description

- description: "We investigated the local preliminary hardening of ferrite near the
    ferrite–martensite interfaces in a dual-phase (DP) steel. Geometrically necessary
    dislocations (GNDs), generated due to interfacial misfit between different phases,
    may cause preliminary hardening of ferrite around such interfaces. However, for
    nano-hardness distribution, the hardened zone was not evidently detected by scattering
    measurement. Thus, we factorized nano-hardness scattering to estimate the actual
    ferrite hardness near ferrite–martensite interfaces. \r\n First, nano-hardness
    was measured around a martensite island using a conical nano-indenter in the DP
    steel containing 10% martensite by volume. Taking into account the scattering,
    the nano-hardness measurement converged to the hardness of ferrite, exceeding
    the distance corresponding to the nano-indenter radius. Thus, a preliminary hardening
    zone was not detected. Subsequently, the surface of the nano-indented microstructure
    was polished and observed using scanning electron microscopy (SEM) by analyzing
    electron back scattering diffraction (EBSD). This analysis confirmed the presence
    of the nano-indented microstructure under ferrite. Moreover, it established that
    the majority of the irregularly higher nano-hardness was caused by the buried
    martensite under ferrite. The value of the kernel average misorientation (KAM),
    which is proportional to the GND density for other irregularly higher nano-hardness
    points, was higher for the nano-indented microstructure as compared to that of
    the buried martensite. On the other hand, the ferrite was expanded under the nano-indented
    points for the majority of the irregularly lower nano-hardness, with some exceptions.
    Further, soft martensite was observed to induce irregularly lower nano-hardness
    locally around the interface."
  description_type: abstract
  lang: eng

## Creator

- name: Reon Ando
  role: author
- name: Takashi Matsuno
  role: author
- name: Tomoko Matsuda
  role: author
- name: Norio Yamashita
  role: author
- name: Hideo Yokota
  role: author
- name: Kenta Goto
  role: author
  orcid: https://orcid.org/0000-0002-0102-0658
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Ikumu Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-7693-1675
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: Iron and Steel Institute of Japan

## Managing organization



## Keyword

- subject: dual phase steel
  schema: not_defined
- subject: grains and interfaces
  schema: not_defined
- subject: scattering
  schema: not_defined
- subject: nanoindentation
  schema: not_defined
- subject: serial sectioning
  schema: not_defined

## Rights

- description: Creative Commons BY Attribution 4.0 International
  identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: ISIJ INTERNATIONAL
  issn: '09151559'
  volume: '61'
  issue: '1'
  start_page: 473
  end_page: 480

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## Fileset

- id: 3de4ff15-1573-4e05-aa6a-0a27657639e7
  filename: ando_ISIJINT2021.pdf
  content_type: application/pdf
  size: 1175670
  md5: 534dd6eab8f92656bbc6dfe2ce0f6d0c

## Thumbnail

fileset_id: 3de4ff15-1573-4e05-aa6a-0a27657639e7
filename: ando_ISIJINT2021.pdf