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

研究成果: 雜誌貢獻文章

9 引文 斯高帕斯(Scopus)

摘要

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.
原文英語
頁(從 - 到)346-351
頁數6
期刊Journal of Alloys and Compounds
493
發行號1-2
DOIs
出版狀態已發佈 - 三月 18 2010

    指紋

ASJC Scopus subject areas

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

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