Effect of multicomponent alloying with Ni, Mn and Mo on phase stability of bcc Fe-Cr alloys

Ponomareva, A. V.; Ruban, Andrei V.; Mukhamedov, B. O.; Abrikosov, Igor A.

doi:10.1016/j.actamat.2018.02.007

Cited by 25 publications

(10 citation statements)

References 61 publications

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“…They showed recently thanks to this use of RDF the proportionality between Cr composition fluctuations' amplitude and hardness increment of the ferrite of the 2507 super duplex stainless steel [11]. Most of these works were made considering the ferrite of duplex stainless steels, or even Fe-Cr binary alloys for the study of Fe-Cr unmixing, which contain higher levels of Cr than the material under study in this work and also different alloying elements' contents, especially Ni, whose effect on the Fe-Cr unmixing kinetics has been shown by different authors [46,47,[75][76][77]. This quite low Cr content makes it possible that the unmixing reaction would follow the nucleation and growth mechanism rather than the spinodal decomposition one -at least it would be the case at the considered temperatures if the material under study has been a binary alloy with similar Cr content.…”

Section: Introductionmentioning

confidence: 99%

“…The Fe-Cr unmixing has also been the focus of a large number of studies since the theories of Cahn et al [36][37][38] until very recent reports [11,12,15,20,34,[39][40][41][42][43][44][45][46][47][48][49][50] with both an experimental and/or a numerical approach. Cahn and Hilliard were the firsts to propose a model for the early stages of spinodal decomposition in solids [36].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural evolution during long time aging of 15–5PH stainless steel

2020

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When subjected to long-term aging at intermediate temperatures, the 15-5PH precipitation hardening martensitic stainless steel is subject to a complex evolution of its microstructure that impacts its service mechanical properties. This evolution includes possible evolution of minor austenite phase, of the copper-rich precipitates, as well as unmixing of the chromium solid solution and formation of silicon-rich precipitates. In this work, a systematic quantification of all these evolutions as a function of aging temperature and time is obtained by combining advanced characterization tools, notably phase and orientation mapping in the transmission electron microscope, atom probe tomography, and small angle X-ray and neutron scattering. Results show a remarkable stability of austenite and Cu precipitation, and evidence the kinetics of Cr unmixing and Si-rich phase formation. We proposed a phenomenological model for the Cr composition fluctuations' amplitude and characteristic length increase with aging and put it in relation to hardness' evolution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural evolution during long time aging of 15–5PH stainless steel

2020

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“…We restrict ourselves to the approximation, in which J αα does not depend on the concentration of the components. This simplification is supported by the fact that the dependence of J FeCr on the chromium concentration is more pronounced in comparison with J CrCr , and especially in comparison with J FeFe [33]. The parameterization proposed below should be understood as a transition to effective exchange energy J FeCr that contains the unaccounted concentration dependence of the exchange energies.…”

Section: Concentration Dependences Of the Mixing And Magnetic Exchange Energiesmentioning

confidence: 92%

“…These data are insufficient for the parametrization of the discussed model because all values must be known for determining the values at intermediate temperatures (see formula (7)). In [33], the J FeFe , J CrCr , and J FeCr exchange energy values were calculated at a chromium concentration of less than 30 at %, but their behavior at high concentrations is unknown. We restrict ourselves to the approximation, in which J αα does not depend on the concentration of the components.…”

Section: Concentration Dependences Of the Mixing And Magnetic Exchange Energiesmentioning

confidence: 99%

Model of Decomposition of Alloy with Two Magnetic Components: the BCC FeCr System

Razumov

Gornostyrev

2021

Phys. Metals Metallogr.

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A sequential model of the decomposition of the bcc FeCr binary alloy is formulated that takes into account the configurational and magnetic contributions to the free energy. Using the results of ab initio calculations, the theory of regular solutions is generalized by considering the contributions of the magnetic entropy, the concentration dependence of the exchange interactions, and the mixing energies. The resulting expression for the free energy makes it possible to construct the boundaries of the two-phase region of the bcc FeCr alloy in good agreement with the experimental data, as well as to predict the position of the spinodal, below which the formation of highly dispersed states should be expected when starting from a homogeneous state.

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“…It was shown that there is a significant increase in the isotropy of the elastic properties of CrN with temperature. The influence of anharmonic effects on phase stability was analyzed and physical properties of AlN nitride characterized by unusually high thermal conductivity were determined [14].…”

Section: Review Of Previous Research Developed By Authors and Their Rmentioning

confidence: 99%

Quantum methods in the development of new materials

Сон¹,

Abrikosov²,

Khvan³

et al. 2019

phst

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The analysis of quantum methods for supercomputer simulations "ab initio", quantum Monte-Carlo (QMC), Density Functional Theory (DFT) and semiempirical approaches like Tomas-Fermi at finite temperatures (TFFT) for gas, plasma and solid phases equilibrium thermodynamics and transport properties are presented. Thermodynamic potentials, entropy, specific enthalpy and their derivatives, specific heat capacity, velocity of sound, shock wave entropy behavior, diffusion, thermal and electrical conductivity, dielectric functions of the new materials for Atomic Energy Industry are analysed. The results are presented in the developed Data Base of Atomic Materials. Equation of state for aluminium melting, temperature dependence of Al thermal conductivity, the thermal pressure of the electrons for tungsten and Al dielectric function are obtained on the basis of experiment and simulation and compared with other works. Al shock adiabats, Al temperature-density and Al sound velocity are analysed by using QMD and MPTEOS simulations. Porous W pressure-mass velocity is investigated using experiments and simulations by QMD.

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Effect of multicomponent alloying with Ni, Mn and Mo on phase stability of bcc Fe-Cr alloys

Cited by 25 publications

References 61 publications

Microstructural evolution during long time aging of 15–5PH stainless steel

Microstructural evolution during long time aging of 15–5PH stainless steel

Model of Decomposition of Alloy with Two Magnetic Components: the BCC FeCr System

Quantum methods in the development of new materials

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