# Homogenization during solution heat treatment of Ni-base single-crystal superallloy TMS-238

https://mdr.nims.go.jp/datasets/315d32b3-e962-4386-a42b-28115bf66054

## File

- [2024_Ohno_EPRI 2024_Homogenization During Solution Heat Treatment of Ni-Base Single-Crystal Superalloy TMS-238.pdf](https://mdr.nims.go.jp/filesets/ae705707-e865-476e-8223-c58c62f2cb30/download) ([Detail](https://mdr.nims.go.jp/filesets/ae705707-e865-476e-8223-c58c62f2cb30.md))

## Id

315d32b3-e962-4386-a42b-28115bf66054

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-03-11T01:16:00.836395Z

## Updated at

2025-03-14T07:30:18.547255Z

## Published at

2025-03-14T07:30:19.672704Z

## Doi



## First published url



## Date published



## Recorded date published



## Resource type

conference_presentation

## Manuscript type

vor

## Collection



## Title

- title: Homogenization during solution heat treatment of Ni-base single-crystal superallloy
    TMS-238
  title_type: original
  lang: en

## Description

- description: "Ni-base single-crystal (SC) superalloys have excellent high temperature
    properties. In order to maximize their properties, it is necessary to homogenize
    the dendritic segregation by solution heat treatment. On the other hand, to reduce
    the processing cost, lower temperatures and shorter heat treatment times are required.
    Therefore, methods to predict the homogenization during heat treatment are needed.
    The objective of this research is to establish an equation for time dependence
    of segregation index.\r\nThe nominal composition of TMS-238 is Ni–4.6Cr–6.5Co–4.0W–1.1Mo–5.9Al–7.6Ta–0.1Hf–6.4Re–5.0Ru(wt%).
    SC ingot was cast in a directional solidification furnace. The specimens were
    solution heat treated at temperatures ranging from 1300 to 1340°C for times ranging
    from 2 to 100 h. The segregation index δ(=(Cd-Cid)/(Cd0-Cid0)), which is used
    to evaluate homogenization during solution heat treatment, was calculated. Cd
    and Cid represent the maximum and minimum element concentrations in the dendrite
    core and inter-dendritic region after heat-treated specimens, Cd0 and Cid0 are
    Cd and Cid of the as-cast ingot, respectively. These concentrations were obtained
    by EPMA analysis.\r\n\r\nThe results show that the segregation of Re was most
    severe in alloying elements, and then the homogenization rate was the smallest.
    For this reason, the apparent diffusion coefficient of Re(Dapp,Re) was used in
    this study as a representative value for homogenization of TMS-238. The linear
    equation describing the time dependence of lnδ at 1300°C can be expressed by applying
    of Dapp,Re=2.41×10-16 m2/s. This was about 1/12 of the diffusion coefficient of
    Re in pure Ni at the same temperature, most likely due to the interaction of alloying
    elements. Dapp,Re can be used for prediction of homogenization during solution
    heat treatment."
  description_type: abstract
  lang: eng

## Creator

- name: Naoki Ohno
  role: author
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Manufacturing Field/High
    Temperature Materials Group
- name: Toshio Osada
  role: author
  orcid: https://orcid.org/0000-0003-1539-9264
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Manufacturing Field/High-Reliability
    Heat-Resistant Materials Group
- name: Chihiro Tabata
  role: author
  orcid: https://orcid.org/0000-0001-6597-4998
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Manufacturing Field/High
    Temperature Materials Group
- name: Tadaharu Yokokawa
  role: author
  orcid: https://orcid.org/0000-0003-1595-6729
  organization: National Institute for Materials Science
  department: Human Resources Division
- name: Ayako Ikeda
  role: author
  orcid: https://orcid.org/0000-0002-1705-9004
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Manufacturing Field/High
    Temperature Materials Group
- name: Kyoko Kawagishi
  role: author
  orcid: https://orcid.org/0000-0001-7652-9232
  organization: National Institute for Materials Science
  department: Research Center for Structural Materials/Materials Manufacturing Field/High
    Temperature Materials Group
- name: Shinsuke Suzuki
  role: author
  organization: Waseda Univeristy

## Contact agent



## Publisher

organization: ASM International

## Managing organization



## Keyword

- subject: apparent diffusion constant
  schema: not_defined
- subject: dendritic segregations
  schema: not_defined
- subject: homogenization
  schema: not_defined
- subject: nickel single crystal superalloys
  schema: not_defined
- subject: solution heat treatment
  schema: not_defined

## Rights

- description: 'Copyright year; 2024 ASM International. This article was published
    in Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings
    from the Tenth International Conference and is made available as an electronic
    reprint with the permission of ASM International. One print or electronic copy
    may be made for personal use only. Systematic or multiple reproduction, distribution
    to multiple locations via electronic or other means, duplications of any material
    in this article for a fee or for commercial purposes, or modification of the content
    of this article is prohibited.'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: 'Advances in Materials, Manufacturing, and Repair for Power Plants: Proceedings
    from the Tenth International Conference'
  start_page: 814
  end_page: 820

## Conference

name: 10th International Conference on Advances in Materials, Manufacturing & Repair
  for Power Plants - EPRI 2024
start_date: 2025-02-25
end_date: 2025-02-28
identifier: https://www.asminternational.org/epri-2024/

## 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: ae705707-e865-476e-8223-c58c62f2cb30
  filename: 2024_Ohno_EPRI 2024_Homogenization During Solution Heat Treatment of Ni-Base
    Single-Crystal Superalloy TMS-238.pdf
  content_type: application/pdf
  size: 1626914
  md5: 475619c76bd02c290da5991d41840a10

## Thumbnail

fileset_id: ae705707-e865-476e-8223-c58c62f2cb30
filename: 2024_Ohno_EPRI 2024_Homogenization During Solution Heat Treatment of Ni-Base
  Single-Crystal Superalloy TMS-238.pdf