# Effect of ausforming on isothermal transformation below the martensite start temperature in NiCrMoV steel: an <i>in-situ</i> neutron diffraction study

https://mdr.nims.go.jp/datasets/f1057367-ed0c-433d-847f-630ddb27ff47

## File

- [2025_Microstructures_(Neutron_Gong).pdf](https://mdr.nims.go.jp/filesets/c81777ba-4473-4668-bd79-51f475f4f2f7/download) ([Detail](https://mdr.nims.go.jp/filesets/c81777ba-4473-4668-bd79-51f475f4f2f7.md))

## Id

f1057367-ed0c-433d-847f-630ddb27ff47

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-05T09:39:00.211373Z

## Updated at

2025-12-08T23:30:10.679502Z

## Published at

2025-12-08T23:24:14.280254Z

## Doi



## First published url

https://doi.org/10.20517/microstructures.2025.26

## Date published

2025-08-04

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: 'Effect of ausforming on isothermal transformation below the martensite start
    temperature in NiCrMoV steel: an <i>in-situ</i> neutron diffraction study'
  title_type: original
  lang: en

## Description

- description: 'In-situ neutron diffraction during the thermomechanical controlled
    processing was employed to investigate the effect of ausforming on isothermal
    transformation below the martensite start temperature (Ms) in the NiCrMoV steel.
    After the occurrence of athermal martensitic transformation during cooling of
    the austenitized sample, the isothermal transformation below the Ms proceeded
    in two distinct stages: Stage 1, characterized by a rapid transformation rate,
    and Stage 2, which progressed more slowly. Ausforming suppressed both the athermal
    martensitic transformation and isothermal transformation in Stage 1 through mechanical
    stabilization. In contrast, ausforming accelerated the isothermal transformation
    in Stage 2, likely due to the enhanced carbon diffusion, indicating bainitic transformation
    characteristics in this stage. The resulting microstructure consisting of tempered
    martensite, bainite and retained austenite exhibited an excellent strength-ductility
    balance, achieving an ultimate tensile strength of 1989 MPa, a uniform elongation
    of 7.1%, and a total elongation of 16%. The present study provides new insights
    into phase transformation mechanisms below Ms and demonstrates the potential of
    ausforming-assisted processing for enhancing the mechanical properties of high-strength
    steels.'
  description_type: abstract
  lang: und

## Creator

- name: Wu Gong
  role: author
- name: Stefanus Harjo
  role: author
- name: Takuro Kawasaki
  role: author
- name: Takayuki Yamashita
  role: author
- name: Akinobu Shibata
  role: author
  orcid: https://orcid.org/0000-0001-8577-6411
  organization: National Institute for Materials Science
- name: Tomoya Shinozaki
  role: author
- name: Yo Tomota
  role: author
  orcid: https://orcid.org/0000-0003-1820-8523
  organization: National Institute for Materials Science
- name: Nobuhiro Tsuji
  role: author

## Contact agent



## Publisher

organization: OAE Publishing Inc.

## Managing organization



## Keyword

- subject: Ausforming
  schema: not_defined
- subject: bainitic transformation
  schema: not_defined
- subject: martensitic transformation
  schema: not_defined
- subject: in-situ neutron diffraction
  schema: not_defined
- subject: microstructure
  schema: not_defined
- subject: mechanical properties
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Microstructures
  issn: '27702995'
  volume: '5'
  issue: '4'
  start_page: 2025087
  end_page: 2025087
  article_number: '2025087'

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## Instrument



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## Measurement method



## Specimen



## Chemical composition



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## Fileset

- id: c81777ba-4473-4668-bd79-51f475f4f2f7
  filename: 2025_Microstructures_(Neutron_Gong).pdf
  content_type: application/pdf
  size: 4884814
  md5: b91ecdb2308c3526e1586d17b86f6f3c

## Thumbnail

fileset_id: c81777ba-4473-4668-bd79-51f475f4f2f7
filename: 2025_Microstructures_(Neutron_Gong).pdf