# Microstructural Characteristics of Modified 9Cr-1Mo Steel with Low Creep Ductility

https://mdr.nims.go.jp/datasets/28c3bbae-0864-4d09-8dea-e9db5d26cd9d

## Files

- [65_ISIJINT-2025-049.pdf](https://mdr.nims.go.jp/filesets/4fc46dab-2c61-4b48-9931-8405bfcb11cf/download) ([Detail](https://mdr.nims.go.jp/filesets/4fc46dab-2c61-4b48-9931-8405bfcb11cf.md))

## Id

28c3bbae-0864-4d09-8dea-e9db5d26cd9d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-17T04:00:48.341855Z

## Updated at

2025-12-06T03:30:10.032584Z

## Published at

2025-12-05T23:33:57.784814Z

## Doi



## First published url

https://doi.org/10.2355/isijinternational.isijint-2025-049

## Date published

2025-07-15

## Recorded date published

2025

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Microstructural Characteristics of Modified 9Cr-1Mo Steel with Low Creep
    Ductility
  title_type: original
  lang: en

## Description

- description: "Microstructures of the two heats of Modified 9Cr-1Mo steel that exhibit
    comparable creep strength\r\nbut largely different creep ductility were analyzed
    to identify the factors that can reduce their\r\ncreep ductility. The critical
    difference between the microstructures of the two heats was the size\r\nand distribution
    of prior austenite grains (PAGs). For the heat with higher creep ductility, the
    size\r\nof the PAGs was ordinary, approximately 20 μm. In contrast, the microstructure
    of the heat with\r\nlow creep ductility was characterized as a mixture of regions
    with ordinary-sized PAGs and\r\nextraordinary coarsened PAGs of several hundred
    micrometers. The creep deformation of the heat\r\nwith low creep ductility was
    found to localize in the regions with ordinary-sized PAGs, which led\r\nto the
    development of creep cavities and cracks, eventually reducing the creep ductility."
  description_type: abstract
  lang: und

## Creator

- name: Nobuaki Sekido
  role: author
  orcid: https://orcid.org/0000-0003-4335-2252
- name: Haruka Nagai
  role: author
- name: Tomotaka Hatakeyama
  role: author
  orcid: https://orcid.org/0000-0002-2904-8177
- name: Kyosuke Yoshimi
  role: author
  orcid: https://orcid.org/0000-0003-3070-3228
- name: Kota Sawada
  role: author
  orcid: https://orcid.org/0000-0001-7780-1648

## Contact agent



## Publisher

organization: Iron and Steel Institute of Japan

## Managing organization



## Keyword

- subject: " ferritic heat-resistant steel"
  schema: not_defined
- subject: creep ductility
  schema: not_defined
- subject: microstructure
  schema: not_defined
- subject: EBSD
  schema: not_defined
- subject: prior-austenite grain
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: ISIJ International
  issn: '09151559'
  volume: '65'
  issue: '8'
  article_number: ISIJINT-2025-049

## Conference



## Related item



## Funding



## 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



## Software



## Custom property



## Fileset

- id: 4fc46dab-2c61-4b48-9931-8405bfcb11cf
  filename: 65_ISIJINT-2025-049.pdf
  content_type: application/pdf
  size: 2064012
  md5: e9d5692a73b375739fca31dd8a236b00

## Thumbnail

fileset_id: 4fc46dab-2c61-4b48-9931-8405bfcb11cf
filename: 65_ISIJINT-2025-049.pdf