Free Energy of Formation of Cementite and the Solubility of Cementite in Austenite

Darken, L. S.; Gurry, R. W.

doi:10.1007/bf03397413

Cited by 13 publications

(17 citation statements)

References 5 publications

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“…The present result will be beneficial to A few comments should be made concerning the effect further research work on cementite and on the improveof Mn and Cu in the solid-state transformation of nodular ment of understanding the structure and properties of iron discussed by Lacaze et al [1] The eutectoid transformasteels. It is OSCAR MARCELO SUAREZ and CARL R. LOPER Jr. believed that this is the first to produce and characterize bulk cementite.…”

Section: Spheroidal Graphite Cast Iron"*mentioning

confidence: 73%

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Production of bulk cementite and its characterization

Umemoto

Liu

Takaoka

et al. 2001

Metall Mater Trans A

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Section: Spheroidal Graphite Cast Iron"*mentioning

confidence: 73%

“…[1] ential scanning calorimeter (DSC) at a heating rate of 20 K/ Its structure has been well studied and determined. As a basic phase in steels, the understanding of its tion (XRD) analysis for phase determination.…”

mentioning

confidence: 99%

Production of bulk cementite and its characterization

Umemoto

Liu

Takaoka

et al. 2001

Metall Mater Trans A

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“…is the free energy density of formation of stoichiometric cementite from pure components (bcc Fe and graphite) which is known from CALPHAD [38] or ab initio calculations [39,40], cem c = 0.25 is the stoichiometric composition of cementite, ) , (…”

Section: A Effective Free Energy Functionalmentioning

confidence: 99%

Autocatalytic Mechanism of Pearlite Transformation in Steel

2017

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A model of pearlite colony formation in carbon steels with ab-initio parameterization is proposed. The model describes the process of decomposition of austenite and cementite formation through a metastable intermediate structure by taking into account the increase of the magnetic order under the cooling. Autocatalytic mechanism of pearlite colony formation and the conditions for its implementation have been analyzed. We demonstrate that pearlite with lamellar structure is formed by autocatalytic mechanism when thermodynamic equilibrium between the initial phase (austenite) and the products of its decomposition (cementite and ferrite) does not take place. By using model expression for free energy with first-principles parameterization we find conditions of formation of both lamellar and globular structures, in agreement with experiment. The transformation diagram is suggested and different scenarios in the kinetics of decomposition are investigated by phase field simulations. 64.60.My, 75.50.Bb

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“…is free energy of formation of cementite from the pure compounds (α-Fe and graphite) known from CALPHAD and ab initio calculations [125,126], ccem is the stoichiometric composition of cementite (ccem=0.25), ) (…”

Section:  mentioning

confidence: 99%

Towards the ab initio based theory of phase transformations in iron and steel

Razumov

Gornostyrev

Katsnelson

2017

Phys. Metals Metallogr.

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Despite of the appearance of numerous new materials, the iron based alloys and steels continue to play an essential role in modern technology. The properties of a steel are determined by its structural state (ferrite, cementite, pearlite, bainite, martensite, and their combination) that is formed under thermal treatment as a result of the shear lattice reconstruction γ (fcc) → α (bcc) and carbon diffusion redistribution. We present a review on a recent progress in the development of a quantitative theory of the phase transformations and microstructure formation in steel that is based on an ab initio parameterization of the Ginzburg-Landau free energy functional. The results of computer modeling describe the regular change of transformation scenario under cooling from ferritic (nucleation and diffusion-controlled growth of the α phase) to martensitic (the shear lattice instability γ → α). It has been shown that the increase in short-range magnetic order with decreasing the temperature plays a key role in the change of transformation scenarios. Phase-field modeling in the framework of a discussed approach demonstrates the typical transformation patterns.

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Free Energy of Formation of Cementite and the Solubility of Cementite in Austenite

Cited by 13 publications

References 5 publications

Production of bulk cementite and its characterization

Production of bulk cementite and its characterization

Autocatalytic Mechanism of Pearlite Transformation in Steel

Towards the ab initio based theory of phase transformations in iron and steel

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