# Effect of impurity elements on the creep rupture strength of Gr. 91 steel welded joints at 650 °C

https://mdr.nims.go.jp/datasets/4f70d974-ac58-4de7-8e07-a67f0b880f93

## File

- [manuscript_MSA_146669.docx](https://mdr.nims.go.jp/filesets/5bd8846f-de2b-4396-a48a-1f06a29cb5e7/download) ([Detail](https://mdr.nims.go.jp/filesets/5bd8846f-de2b-4396-a48a-1f06a29cb5e7.md))

## Id

4f70d974-ac58-4de7-8e07-a67f0b880f93

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-05-27T00:08:59.011446Z

## Updated at

2024-05-27T01:59:55.634841Z

## Published at

2026-05-18T23:27:22.960356Z

## Doi

https://doi.org/10.48505/nims.4519

## First published url

https://doi.org/10.1016/j.msea.2024.146669

## Date published

2024-05-18

## Recorded date published

2024-6

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Effect of impurity elements on the creep rupture strength of Gr. 91 steel
    welded joints at 650 °C
  title_type: original
  lang: en

## Description

- description: "The upper limits for Sb, As, and Sn in Gr. 91 steel are set by the
    recent standardized\r\nGr. 91 Type 2 specification. To clarify how the three impurities
    impact the\r\nmicrostructures and creep rupture strength of Gr. 91 welded joints,
    two types of steel\r\nwith varying impurity concentrations were prepared. The
    first contained high impurity\r\nconcentrations (Steel 1), while the other had
    low impurity concentrations (Steel 2). The\r\nresults of the creep tests on the
    welded joints showed that Steel 1 had lower creep\r\nrupture strength compared
    to Steel 2, indicating premature failure caused by the\r\nimpurities. Comparing
    the microstructures in the as-welded joints, it was observed that\r\nSteel 1 had
    more M23C6 particles in the fine-grained heat affected zone (FGHAZ) than\r\nSteel
    2. This finding indicates that M23C6 dissolution during the welding process was\r\nhindered
    in Steel 1. It is believed that M23C6 dissolution was reduced due to the\r\nsegregation
    of impurities at the grain boundaries or the interface between the matrix\r\nand
    M23C6 particles. Consequently, the microstructure in FGHAZ of Steel 1 showed\r\nlower
    creep resistance because the pinning force by M23C6 was decreased due to the\r\nreduction
    of re-precipitation on the grain boundaries during post weld heat treatment.\r\nThe
    degradation in the creep rupture strength due to the impurities was attributed
    to\r\nthe earlier progression of recovery process in FGHAZ during creep, leading
    to\r\npremature creep void formation."
  description_type: abstract
  lang: und

## Creator

- name: Katsuhiro Sato
  role: author
- name: Masatoshi Mitsuhara
  role: author
- name: Kodai Nagata
  role: author
- name: Keiji Kubushiro
  role: author
- name: Kyohei Nomura
  role: author
- name: Takahiro Kimura
  role: author
- name: Yoshiki Shioda
  role: author
- name: Kota Sawada
  role: author
  orcid: https://orcid.org/0000-0001-7780-1648
- name: Kazuhiro Kimura
  role: author
  orcid: https://orcid.org/0000-0001-7906-2703
- name: Hideharu Nakashima
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: creep strength enhanced ferritic steel
  schema: not_defined
- subject: creep void
  schema: not_defined
- subject: M23C6
  schema: not_defined
- subject: re-precipitation
  schema: not_defined
- subject: impurity element
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-05-18
end_date: 2026-05-19

## Journal

- title: 'Materials Science and Engineering: A'
  issn: '09215093'
  volume: '903'
  article_number: '146669'

## Conference



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## Measurement method



## Specimen



## Chemical composition



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## Fileset

- id: 5bd8846f-de2b-4396-a48a-1f06a29cb5e7
  filename: manuscript_MSA_146669.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 9765274
  md5: 59fe005d1a5a307d896ccce111f4d05b

## Thumbnail

fileset_id: 5bd8846f-de2b-4396-a48a-1f06a29cb5e7
filename: manuscript_MSA_146669.docx