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

doi:10.1016/j.matchar.2009.11.011

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 journal › Article › peer-review

35 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)₃AlC_x) 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 language	English
Pages (from-to)	206-211
Number of pages	6
Journal	Materials Characterization
Volume	61
Issue number	2
DOIs	https://doi.org/10.1016/j.matchar.2009.11.011
Publication status	Published - Feb 2010

Keywords

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

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
General Materials Science

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10.1016/j.matchar.2009.11.011

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

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.",

keywords = "Chromium carbide, Fe-Al-Mn-C-Cr alloy, High-temperature microstructure, Phase transformations, Transmission electron microscopy",

author = "Chen, {May Show} and Cheng, {Hsin Chung} and Huang, {Chiung Fang} and Chao, {Chih Yeh} and Ou, {Keng Liang} and Yu, {Chih Hua}",

year = "2010",

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T1 - Effects of C and Cr content on high-temperature microstructures of Fe-9Al-30Mn-xC-yCr alloys

AU - Chen, May Show

AU - Cheng, Hsin Chung

AU - Huang, Chiung Fang

AU - Chao, Chih Yeh

AU - Ou, Keng Liang

AU - Yu, Chih Hua

PY - 2010/2

Y1 - 2010/2

N2 - 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.

AB - 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.

KW - Chromium carbide

KW - Fe-Al-Mn-C-Cr alloy

KW - High-temperature microstructure

KW - Phase transformations

KW - Transmission electron microscopy

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

Abstract

Keywords

ASJC Scopus subject areas

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