Effect of E21-Fe3AlC precipitation on mechanical properties of γ -austenite stabilized by addition of Mn and Co

Seiji Miura, Hiroaki Ishii, Tetsuo Mohri

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)


Effects of Co addition on the phase relation and mechanical properties of an E21-Fe3AlC phase in the Fe-Mn-Al-C system are investigated. The relation between the γ-austenite and E21 phases is the same with Co-free alloys. Two kinds of precipitation processes of E21 phase from γ-austenite matrix are observed: a fine E21 phase precipitation and a cellular structure formation from grain boundaries. The cellular structure formation is explained in relation to the lattice mismatch evaluated by XRD. The lattice mismatch is estimated to be ∼3%, rather higher than that of γ/γ' in Ni-based superalloys, and the volume fraction of the E21-Fe3AlC phase precipitated in the γ-austenite phase is as large as 30%. The micro-vickers hardness increases with increasing Al or C, caused by the increase in the volume fraction of the E21-Fe3AlC phase.

Original languageEnglish
Pages (from-to)N5201-N5206
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 2001
EventHigh Temperature Ordered Intermetallic Alloys IX - Boston, MA, United States
Duration: 2000 Nov 272000 Nov 29

ASJC Scopus subject areas

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


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