Alloy carbide precipitation in tempered 2.25 Cr–Mo steel under high magnetic field

Hou, Tingping; Wu, Kai

doi:10.1016/j.actamat.2012.12.021

Cited by 41 publications

(23 citation statements)

References 43 publications

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“…Under normal circumstances it is generally believed that the alloy carbides are paramagnetic phases and the external field has almost no influence on them. However, preliminary results have revealed that the precipitation sequence and substitutional solute atom concentration of alloy carbides M 6 C and M 23 C 6 are changed by high magnetic fields [8,11,12]. Magnetic-fieldinduced precipitation in alloys, especially for steels used under the extreme conditions of high magnetic field and intermediate temperature, is an important scientific and technological interest.…”

Section: Introductionmentioning

confidence: 98%

Magnetic-field-induced magnetism and thermal stability of carbides Fe6−xMoxC in molybdenum-containing steels

Hou

et al. 2016

Acta Materialia

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Section: Introductionmentioning

confidence: 98%

Magnetic-field-induced magnetism and thermal stability of carbides Fe6−xMoxC in molybdenum-containing steels

Hou

et al. 2016

Acta Materialia

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“…It is illustrated that the carbides becomes more stable when Cr atom are replaced by Fe. However, the carbides become unstable when reducing the magnetization at higher temperature …”

Section: Resultsmentioning

confidence: 99%

Solid Phase Decarburization Kinetics of High‐Carbon Ferrochrome Powders in the Microwave Field

Hao

Chen

Han

et al. 2013

steel research int.

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Solid phase decarburization of high carbon ferrochrome powders (HCFP) mixed with calcium carbonate powders (CCP) can be realized at a certain temperature in microwave heating field. The modified kinetic model is used and the results illustrate that, gas inner diffusion is the restrictive step of decarburization reaction, and apparent activation energy of the reaction is 72.80 kJ mol À1 , which is much lower than that of carbon gasification reaction by conventional heating. Backscattered electron image analysis shows that the carbides in decarburized ferrochrome powders vary with temperature. With the temperature rising, the ratio of (Cr,Fe) 7 C 3 decreases, (Cr,Fe) 23 C 6 and chromium ferrite increases in the microwave field. Meanwhile, the thickness of oxide film around the decarburized ferrochrome powders enhances, which hinders gas inner diffusion. The optimum conditions of solid phase decarburization of HCFP by microwave heating are 11008C and holding for 60 min.

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“…However, first-principle calculations are limited to the ground state properties of carbides (0 K, 0 Pa). Further research is needed to explore the properties of carbides under realistic processing conditions, especially with magnetic fields and different temperatures.In the present paper, the mechanism of carbide precipitation with a high magnetic field is investigated from the perspective of thermodynamics based on existing experimental results [4]. The magnetic moments are obtained by first-principle calculations, and the relationship between the magnetic moment and the structure of Fe 20 Cr 3 C 6 has been investigated.…”

mentioning

confidence: 99%

“…It is a typical intermediate temperature heat resistant steel. The alloy design and heat treatments were introduced in the previous work [4]. The magnetic field was applied during tempering at 823 K (550 • C) for 1 h (3600 s).…”

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confidence: 99%

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Thermodynamic Analysis for the Magnetic-Field-Induced Precipitation Behaviours in Steels

Hou

et al. 2019

Metals

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Alloy carbide M23C6 plays a significant role in the creep strength of reduced activation steels. Experiments have proven that a magnetic field accelerates the precipitation of M23C6 at intermediate temperature. A scheme that combines first-principle calculations, Weiss molecular field theory and equilibrium software MTDATA is proposed to investigate the thermodynamic features of magnetic-field-induced precipitation. The calculated results reveal that the origin of the magnetic moment is the NaCl-like crystal structure. The magnetic field enhances the exchange coupling and stabilizes the ferromagnetic phase region. The external field influences the Curie temperature, thereby changing the magnitude and position of the maximum magnetic heat capacity, magnetic entropy and enthalpy. The strong magnetic field improves the stability of M23C6, and the theoretical results agree well with the previous experiment. The study provides a theoretical basis for the magnetic-field-induced precipitation behaviours in steels.

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Alloy carbide precipitation in tempered 2.25 Cr–Mo steel under high magnetic field

Cited by 41 publications

References 43 publications

Magnetic-field-induced magnetism and thermal stability of carbides Fe6−xMoxC in molybdenum-containing steels

Magnetic-field-induced magnetism and thermal stability of carbides Fe6−xMoxC in molybdenum-containing steels

Solid Phase Decarburization Kinetics of High‐Carbon Ferrochrome Powders in the Microwave Field

Thermodynamic Analysis for the Magnetic-Field-Induced Precipitation Behaviours in Steels

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