Effects of C and Cr content on high-temperature microstructures of Fe-9Al-30Mn-xC-yCr alloys

May Show Chen, Hsin Chung Cheng, Chiung Fang Huang, Chih Yeh Chao, Keng Liang Ou, Chih Hua Yu

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This investigation elucidated the effects of C and Cr content on the high-temperature microstructures of Fe-9Al-30Mn-xC-yCr alloys by means of optical microscopy and transmission electron microscopy. With increasing Cr content, the phase transition sequence within the α phase was found to be α + B2 → α + B2 + DO3 → α + DO3. And with increasing C content, a γ → (γ + κ) phase transition was observed within the γ phase. The κ phase carbides ((Fe,Mn)3AlCx) had an ordered L′12-type structure with lattice parameter a = 0.368 nm and were formed by a spinodal decomposition during quenching. The amounts of Cr7C3 increased with the C and Cr content. Moreover, the Al and Mn content played important roles in expanding the (α + γ) region. These features have not been previously reported in the Fe-Al-Mn-C-Cr alloy system.

Original languageEnglish
Pages (from-to)206-211
Number of pages6
JournalMaterials Characterization
Volume61
Issue number2
DOIs
Publication statusPublished - Feb 2010

Fingerprint

Phase transitions
Spinodal decomposition
microstructure
Microstructure
Light transmission
Lattice constants
Optical microscopy
Carbides
Quenching
Transmission electron microscopy
Temperature
carbides
lattice parameters
quenching
microscopy
decomposition
transmission electron microscopy

Keywords

  • Chromium carbide
  • Fe-Al-Mn-C-Cr alloy
  • High-temperature microstructure
  • Phase transformations
  • Transmission electron microscopy

ASJC Scopus subject areas

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

Cite this

Effects of C and Cr content on high-temperature microstructures of Fe-9Al-30Mn-xC-yCr alloys. / Chen, May Show; Cheng, Hsin Chung; Huang, Chiung Fang; Chao, Chih Yeh; Ou, Keng Liang; Yu, Chih Hua.

In: Materials Characterization, Vol. 61, No. 2, 02.2010, p. 206-211.

Research output: Contribution to journalArticle

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AU - Ou, Keng Liang

AU - Yu, Chih Hua

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