Microstructure prediction for TMW-4M3 during heat treatment

Takaaki Hara, Shinichi Kobayashi, Tomonori Ueno, Nobufumi Ueshima, Katsunari Oikawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The alloy TMW-4M3 has been developed as a novel cast and wrought alloy based on a concept of combining Ni-base and Co-base superalloys. This alloy contains higher amounts of Co and Ti than Alloy 720Li. For practical applications, it is very important to control the size and distribution of γ’ phase as an intended microstructure. However, precipitation behavior of this type of alloy greatly depends on heat treatment conditions. In this study, we made a modification to the thermodynamic database in order to obtain reasonable γ/γ’ phase boundary in the range of high Co composition. By using it, both the nucleation rate calculation based on classical nucleation theory and the microstructure evolution prediction based on the phase field method were applied to the precipitation of intragranular γ’ particles during the heat treatment process. The simulated microstructures under different temperature history conditions agree well with experiments in both the size and the morphology of γ’ precipitates.

Original languageEnglish
Title of host publicationTMS 2018 147th Annual Meeting and Exhibition Supplemental Proceedings
PublisherSpringer International Publishing
Pages335-340
Number of pages6
ISBN (Print)9783319725253
DOIs
Publication statusPublished - 2018 Jan 1
Event147th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2018 - Phoenix, United States
Duration: 2018 Mar 112018 Mar 15

Publication series

NameMinerals, Metals and Materials Series
VolumePart F12
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Other

Other147th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2018
CountryUnited States
CityPhoenix
Period18/3/1118/3/15

Keywords

  • Gamma prime
  • Microstructure
  • Nucleation rate
  • Phase-field method
  • TMW-4M3

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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