A thermodynamic evaluation of the Fe–Cr–C system

Khvan, A.; Hallstedt, Bengt; Broeckmann, Christoph

doi:10.1016/j.calphad.2014.01.002

Cited by 59 publications

(24 citation statements)

References 40 publications

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“…At T = 1200 K, of the most stable carbide at x Fe ≈ 0.087 (Fe – – Fe 1/12 ), was calculated as approximately −4.09 eV/supercell, quite comparable with the experimental enthalpy of −3.34 eV/supercell 52 and higher than the value of −12.12 eV/supercell reported using a thermodynamic Calphad assessment of the Fe–Cr–C system 53 .…”

Section: Resultssupporting

confidence: 78%

Effect of mixed partial occupation of metal sites on the phase stability of γ-Cr23−xFe x C6 (x = 0–3) carbides

Souissi

Sluiter

Matsunaga

et al. 2018

Sci Rep

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The effect of mixed partial occupation of metal sites on the phase stability of the γ-Cr23−xFexC6 (x = 0–3) carbides is explored as function of composition and temperature. Ab initio calculations combined with statistical thermodynamics approaches reveal that the site occupation of the carbides may be incorrectly predicted when only the commonly used approach of full sublattice occupation is considered. We found that the γ-M23C6 structure can be understood as a familiar sodium chloride structure with positively charged rhombic dodecahedron (M(4a) M12(48h)) and negatively charged cubo-octahedron (M8(32f) C6(24e)) super-ion clusters, together with interstitial metal atoms at the 8c sites. The stability of the partially occupied phase can be easily rationalized on the basis of a super-ion analysis of the carbide phase. This new understanding of γ-M23C6 carbides may facilitate further development of high-chromium heat-resistant steels.

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Section: Resultssupporting

confidence: 78%

Effect of mixed partial occupation of metal sites on the phase stability of γ-Cr23−xFe x C6 (x = 0–3) carbides

Souissi

Sluiter

Matsunaga

et al. 2018

Sci Rep

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“…The microstructure of Fe-Cr alloys is shown in figure 3. Combined with the results from other researches, it is known that during the heat treatment at 1100°C, the phase in all alloys is mainly austenite [29][30][31]. After quenching, it is reasonable to detect that the main structures of all the alloys are lath martensite and retained austenite.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 67%

Effect of chromium content on the erosion-corrosion behavior of Fe-Cr alloy produced by ball milling liner in weakly alkaline slurry

Zheng

Chen²,

Long

et al. 2020

Mater. Res. Express

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Fe-Cr alloys with different chromium contents have been designed in the current study for the ball mill liner working in weakly alkaline slurry. The structure, mechanical properties, corrosion behavior and erosion-corrosion behavior of the alloys were investigated. The result shows that with the increasing Cr content, the hardness and corrosion resistance of the alloy are improved. However, the impact toughness of the alloy shows a decreasing trend with the increase of Cr content. The alloy with the Cr content of 6.978 wt% exhibits the best erosion-corrosion resistance among all alloys in the weakly alkaline slurry. Further analysis shows that the erosion-corrosion mass loss of these alloys in weakly alkaline slurry mainly results from pure mechanical erosion and the interaction between corrosion and erosion. The damage process has also been discussed by interaction models of corrosion and erosion. The result is beneficial to provide reference for selection and development of erosioncorrosion resistant material for ball mill liner working in weakly alkaline medium.

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“…The electron-probe microanalysis (EPMA) revealed that matrix contains about 23 wt% of Cr. Based on carbon and chromium content in the alloy and results presented by Khvan et al [9], focused on thermodynamic analysis of the Fe-Cr-C system, in equilibrium conditions the appearance of M 23 C 6 carbides in the Fe24Cr0.8C alloy might be expected. Figure 4 shows morphologies of observed phases in Fe-Cr-C alloy with corresponding selective area diffraction (SAD) patterns.…”

Section: Methodsmentioning

confidence: 96%

“…Generally, the main factors affecting these parameters are chemical composition, including varying the Cr/C ratio, and solidification conditions [3,[5][6][7]. Depending on the Cr/C ratio three types of microstructures are possible such as hypoeutectic, eutectic, and hypereutectic strengthened by the cementite M 3 C, M 7 C 3 and M 23 C 6 complex carbides, where M is Cr and Fe [5,6,[8][9][10][11][12][13]. For equilibrium conditions phase composition might be predicted using Fe-Cr-C phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Crystallography and Morphology of Chromium Rich Eutectic Carbides in an As-Cast Fe-Cr-C Alloy Crystallized in Non-Equilibrium Conditions

et al. 2016

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The crystallography and microstructure of eutectic carbides crystallizing in non-equilibrium conditions in hypoeutectic Fe24Cr0.8C have been studied by light microscopy, scanning electron microscopy, and transmission electron microscopy. The alloy was synthesized in an arc furnace in high purity argon atmosphere and crystallized on water-cooled copper mould. Greater thermal gradient in regions close to water-cooled, copper mould in comparison with top of the ingot gives a formation of eutectic carbides with two morphologies: large polygonal carbides and surrounding them much smaller, plate-like carbides instead of rod-like carbides, observed in top of the ingot. There was no evidence for influence of non-equilibrium crystallization to the formation of types of carbides different than M23C6.

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A thermodynamic evaluation of the Fe–Cr–C system

Cited by 59 publications

References 40 publications

Effect of mixed partial occupation of metal sites on the phase stability of γ-Cr23−xFe x C6 (x = 0–3) carbides

Effect of mixed partial occupation of metal sites on the phase stability of γ-Cr23−xFe x C6 (x = 0–3) carbides

Effect of chromium content on the erosion-corrosion behavior of Fe-Cr alloy produced by ball milling liner in weakly alkaline slurry

Crystallography and Morphology of Chromium Rich Eutectic Carbides in an As-Cast Fe-Cr-C Alloy Crystallized in Non-Equilibrium Conditions

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