Effects of cobalt content on the microstructures of Fe-9Al-30Mn-1C-xCo alloys

Chin Sung Chen, Che Tong Lin, Pei Wen Peng, Mao Suan Huang, Keng Liang Ou, Ling Hung Lin, Chih Hua Yu

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The microstructure of the as-cast Fe-Al-Mn-C-Co alloy was a mixture of the (α + DO3 + γ + κ) phases. However, the microstructure of the alloy with 9.0 wt.% Co content was nearly a single γ phase. As the alloys underwent heat treatment between 1000 °C and 1100 °C, their microstructure changed to the (γ + κ) phase. The κ phase carbides ((Fe,Mn)3AlCx) had an ordered L′12-type structure with lattice parameter a = 0.385 nm and were formed by a spinodal decomposition during quenching. The alloy with Co content ≥5.0 wt.% was aged at 650-950 °C, a (γ + κ) → (γ + κ + Co23C6) → (γ + Co23C6) phase transition was observed in the matrix and on the grain boundaries. It is believed that the addition of Co not only stabilizes the austenitic structure at high temperatures but also inhibits and/or prolongs the precipitation of the κ phase during the aging process.

Original languageEnglish
Pages (from-to)346-351
Number of pages6
JournalJournal of Alloys and Compounds
Volume493
Issue number1-2
DOIs
Publication statusPublished - Mar 18 2010

Keywords

  • κ phase
  • Cobalt carbide
  • Fe-Al-Mn-C-Co alloy
  • Microstructure
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

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