Kinetics of the α-α′ phase separation in a 14%Cr oxide dispersion steel at intermediate temperatures

Yael Templeman, Malki Pinkas, Eli Brosh, Einat Strumza, Shmuel Hayun, Louisa Meshi

Research output: Contribution to journalArticlepeer-review

Abstract

Current paper presents a study of the α–α′ phase separation during prolonged heat treatments at 400 and 450 °C of 14%Cr oxide dispersion strengthened steel. Vickers hardness, thermo-electric power and differential scanning calorimetry measurements enabled to conclude that α′ precipitates already after 5,000 hr at 400 °C, while at 450 °C precipitation is detected only after 10,000 hr. Yet, the amount of α′ after 10,000 hr at 450 °C was larger. The results, combined with thermodynamic and diffusion length calculations, affirm that in 14%Cr ODS steel the separation occurs by the nucleation and growth mechanism rather than spinodal decomposition.

Original languageEnglish
Article number129088
JournalMaterials Letters
Volume285
DOIs
StatePublished - 15 Feb 2021

Keywords

  • Embrittlement
  • Nucleation and growth
  • ODS steels
  • α-α′ phase separation

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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