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 contributionpeer-review


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
Number of pages6
ISBN (Print)9783319725253
Publication statusPublished - 2018
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


Conference147th Annual Meeting and Exhibition of the Minerals, Metals and Materials Society, TMS 2018
Country/TerritoryUnited States


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


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