The iron-carbon system. New developments—I. The pseudohexagonal iron carbide Fe7C3 and the Fe3C-Fe7C3 eutectic

Жуков, А. А.; Shterenberg, L. E.; Shalashov, V. A.; Thomas, V.K; Berezovskaya, N. A.

doi:10.1016/0001-6160(73)90003-5

Cited by 43 publications

(9 citation statements)

References 4 publications

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“…The creation of diamond particles was speculated by the present authors in previous publications, 11,71) where it was noted that diamond and Fe are in equilibrium at low temperature. [87][88][89] The described model is based on the formation of an enriched BCT phase from quenching. In the model given in Fig.…”

Section: Nature and Composition Of Carbon-rich Phases Inmentioning

confidence: 99%

Revisiting the Structure of Martensite in Iron-Carbon Steels

et al. 2008

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A model is developed to describe the formation and crystal structure of martensite in quenched Fe-C steels based on the extensive published literature on the subject. Unique changes in the properties and structure of martensite are shown to occur at 0.6 mass% C, designated as the H-point. The concept of primary and secondary martensite is introduced in order to indicate that two different, sequential, martensites will form during quenching of Fe-C steels above 0.6 mass% C. Below 0.6 mass% C, only primary martensite is created through the two sequential steps FCC ! HCP followed by HCP ! BCC. Primary martensite has a lath structure and is described as BCC iron containing a C-rich phase that precipitates during quenching. The HCP transition phase is critical in interpreting the two martensite structures based on the premise that the maximum solubility of C in the HCP phase is 0.6 mass%. Primary martensite continues to form at compositions greater than 0.6 mass% C with the creation of a carbon-rich BCT phase. This is followed by the start of secondary martensite which forms at the M S (martensite start temperature) and creates the traditional BCT plates adjoining retained austenite. Both martensites are predicted to co-exist at the highest C contents. A quantitative model, based on the specific volume of the various phases obtained after quenching, has been used to calculate the composition of the precipitated C-rich phase for a 0.88 mass% C steel. It is predicted that the carbon-rich phase is either diamond or (Fe 2 C) carbide.

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Section: Nature and Composition Of Carbon-rich Phases Inmentioning

confidence: 99%

Revisiting the Structure of Martensite in Iron-Carbon Steels

et al. 2008

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“…При этом авторы указанной работы установили температуру эвтектики в системе Fe-C 1345 °С, а температуру реакции перитектического образования Fe 3 C 1415 °С. Кристаллизация карбида Fe 7 C 3 экспериментально установлена в [4] при 8 ГПа и 1400 °С. При этом авторы цитируемой статьи указывают на существование эвтектики расплав Fe 3 C + Fe 7 C 3 , которая зафиксирована также при 3,3 ГПа и 1300 °С.…”

Section: геохимияunclassified

“…О величине давления, при котором в данной системе становится стабильным карбид Fe 7 C 3 , нет единой точки зрения до сих пор. Так, вслед за [4] на высокие давления появления карбида Fe 7 C 3 (порядка 8 ГПа и выше) указывается в [5]. Но имеются экспериментальные исследования, в которых кристаллизация карбида Fe 7 C 3 зафиксирована при 5,9 ГПа [1], 6,0 ГПа [7], 5,7 ГПа [8].…”

Section: геохимияunclassified

Synthesis of new polytype modifications of Fe7C3 AT 5,5 GPa

Chepurov

Gromilov

Сонин

et al. 2019

Доклады Академии наук

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The paper presents the results of experimental studies on the synthesis of carbide Fe7C3 at 5,5 GPa. It was found that carbide Fe3C and several polytypes of carbide Fe7C3 are formed together with diamond when the system is cooled. It is believed that Fe7C3 carbide may be a component of the Earth’s inner core. The obtained results indicate that carbide Fe7C3 in the form of polytypic modifications under natural conditions could be formed at relatively low pressures at the stage of differentiation of the Earth.

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“…65 It is known that Fe 2 C, and carbon as diamond, are in equilibrium with ferrite at low temperature. [66][67][68] The nano-carbide particles could have special properties. For example, they may be paramagnetic and not ferromagnetic in the same way that epsilon martensite is not ferromagnetic.…”

Section: Evidence For Nano-carbides In Fe-c Steelsmentioning

confidence: 99%

Microstructure in adiabatic shear bands in a pearlitic ultrahigh carbon steel

Syn¹,

Lesuer²,

Sherby³

2005

Materials Science and Technology

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Adiabatic shear bands, obtained in compression deformation at a strain rate of 4000 s -1 , in a pearlitic 1.3%C steel, were investigated. Shear-bands initiated at 55% compression deformation with the width of the band equal to 14 µm. Nano-indentor hardness of the shear band was 11.5 GPa in contrast to the initial matrix hardness of 3.5 GPa. The high strength of the shear band is attributed to its creation from two sequential events. First, large strain deformation, at a high strain rate, accompanied by adiabatic heating, led to phase transformation to austenite. Second, retransformation upon rapid cooling occurred by a divorced eutectoid transformation. The result is a predicted microstructure consisting of nano-size carbide particles within a matrix of fine ferrite grains. It is proposed that the divorced eutectoid transformation occurs in iron-carbon steels during high rate deformation in ball milling, ball drop tests and in commercial wire drawing.

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The iron-carbon system. New developments—I. The pseudohexagonal iron carbide Fe7C3 and the Fe3C-Fe7C3 eutectic

Cited by 43 publications

References 4 publications

Revisiting the Structure of Martensite in Iron-Carbon Steels

Revisiting the Structure of Martensite in Iron-Carbon Steels

Synthesis of new polytype modifications of Fe7C3 AT 5,5 GPa

Microstructure in adiabatic shear bands in a pearlitic ultrahigh carbon steel

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