Microstructural change in austenitic Fe-30.0wt%Mn-7.8wt%Al-1.3wt%C initiated by spinodal decomposition and its influence on mechanical properties

Choo, Woong Kil; Kim, J.H.; Yoon, Jong Chan

doi:10.1016/s1359-6454(97)00201-2

Cited by 204 publications

(105 citation statements)

References 36 publications

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“…This indicates that the alloy B (5Cr) exhibited the best corrosion resistance in 3.5% NaCl solution. (2) Compared to the previous studies of the as-quenched austenitic FeAlMnCrC alloys with Cr 3%, the present result shows that the E corr and E pp would be pronouncedly increased as the Cr content was added up to 5%. The reason is that the 5% Cr could be completely dissolved within the austenite matrix at 1373 K. …”

Section: Discussioncontrasting

confidence: 83%

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Effect of Chromium Content on Corrosion Behaviors of Fe-9Al-30Mn-(3,5,6.5,8)Cr-1C Alloys

et al. 2007

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The corrosion behaviors of the as-quenched austenitic 5,6.5,8)%Cr-1%C (in mass%) alloys in 3.5% NaCl solution have been examined. Passivation could be observed for all of the four alloys. The corrosion potential (E corr ) and pitting potential (E pp ) increased pronouncedly as Cr content increased from 3 to 5%, and decreased as Cr content up to 6.5 and 8%. The decrease of E corr and E pp of alloys containing 6.5 and 8% Cr was due to the formation of (Fe,Mn,Cr) 7 C 3 carbides within the austenite matrix and on the grain boundaries. The present result indicates that the Fe-9%Al-30%Mn-5%Cr-1%C alloy exhibited the highest corrosion resistance in 3.5% NaCl solution. It is worthy to note that the corrosion behaviors of the austenitic FeAlMnCrC alloys with higher Cr (! 3%) content have never been reported in previous literature.

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Section: Discussioncontrasting

confidence: 83%

“…In previous studies, [1][2][3][4][5][6] it is clear that fully austenitic Fe-(7.8-10.0)%Al-(28.0-32.2)%Mn-(0.86-1.30)%C alloys could posses excellent mechanical properties. However, the corrosion resistance of the austenitic FeAlMnC alloys in aqueous environments was not adequate for the applications in industry.…”

Section: Introductionmentioning

confidence: 96%

Effect of Chromium Content on Corrosion Behaviors of Fe-9Al-30Mn-(3,5,6.5,8)Cr-1C Alloys

et al. 2007

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“…The former is still outstanding due to mold flux problem. Some progress has been made in solving the latter challenge [2][3][4][5][6]. It is noticed that a high Al steel with austenite () matrix possesses better formability than that with ferrite (α) matrix [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of κ-carbide interface structure on the formability of lightweight steels

Qin

2016

Materials & Design

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Abstractκ-carbide () in high aluminium (Al) steels is grown from austenite () via + or α+ ( represents ferrite), and is a lamellar structure. This work demonstrates that the formability of high Al lightweight steels is affected by the lattice misfit and interface shape between  and matrix. The cold workability can be improved by either to change the steel chemical constitution or to implement an electro-thermo-mechanical process. For ferrite-matrix-based high Al steel, electric-current promotes the spheroidization and refinement of  structure and reduces volume fraction of  phase. This retards the crack nucleation and propagation, and hence improves the materials formability. The observation is caused by a direct effect of electric-current rather than side effects.

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“…[1][2][3][4][5][6][7][8] These studies have shown that in the as-quenched condition, the microstructure of the alloy with a chemical composition in the range of Fe-(26-34)%Mn-(6-11)%Al-(0.54-1.3)%C was single-phase austenite (). After being aged at 500-750 C for moderate times, fine and coarse (Fe,Mn) 3 AlC carbides ( carbides) having an L'1 2 -type structure were observed to precipitate coherently within the austenite matrix and also heterogeneously on the austenite grain boundaries, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…carbide + -Mn reaction, or a ! þ carbide + -Mn reaction, [5][6][7][8] depending on the chemical composition and aging temperature. In order to improve the corrosion resistance, chromium has been added to the austenitic FeMnAlC alloys.…”

Section: Introductionmentioning

confidence: 99%

Grain Boundary Precipitation in Fe-30Mn-9Al-5Cr-0.7C Alloy

et al. 2008

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The as-quenched microstructure of the Fe-30%Mn-9%Al-5%Cr-0.7%C (in mass%) alloy was single-phase austenite. When the as-quenched alloy was aged at 550 C-750 C, fine (Fe,Mn) 3 AlC carbides were formed within the austenite matrix. In addition, as the aging temperature increased, a M 7 C 3 carbide + D0 3 ! M 7 C 3 carbide + B2 ! M 7 C 3 carbide + (ferrite) phase transition had occurred on the grain boundaries. This grain boundary precipitation behavior has never before been observed in FeMnAlC and FeMnAlCrC alloy systems.

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Microstructural change in austenitic Fe-30.0wt%Mn-7.8wt%Al-1.3wt%C initiated by spinodal decomposition and its influence on mechanical properties

Cited by 204 publications

References 36 publications

Effect of Chromium Content on Corrosion Behaviors of Fe-9Al-30Mn-(3,5,6.5,8)Cr-1C Alloys

Effect of Chromium Content on Corrosion Behaviors of Fe-9Al-30Mn-(3,5,6.5,8)Cr-1C Alloys

Influence of κ-carbide interface structure on the formability of lightweight steels

Grain Boundary Precipitation in Fe-30Mn-9Al-5Cr-0.7C Alloy

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