Structure and Properties of Molten Metals

Egry, Iván

doi:10.1016/b978-0-08-096986-2.00007-2

Cited by 12 publications

(7 citation statements)

References 187 publications

(186 reference statements)

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“…Obviously, there is some relationship between these results and the difference in the diffusion coefficients of various alloying elements liquid iron [25]. Undoubtedly, the conditions under which the indicated diffusion coefficients were determined are far from those that are realized at the moment of pulsed laser action, when abnormal mass transfer occurs, rather than diffusion processes.…”

Section: Resalts and Discussionmentioning

confidence: 99%

“…Undoubtedly, the conditions under which the indicated diffusion coefficients were determined are far from those that are realized at the moment of pulsed laser action, when abnormal mass transfer occurs, rather than diffusion processes. The authors of [25] showed that alloying elements diffuse in liquid iron at rates that differ significantly from each other, which is associated with their different solubility in clusters and the disordered zone of the melt. In this work, alloying elements are divided into three groups according to the degree of solubility in liquid iron.…”

Section: Resalts and Discussionmentioning

confidence: 99%

“…As for the conditions of pulsed laser exposure, the sharp heating of the melt in a thin surface layer obviously violates its equilibrium structure and also causes cluster polymorphism [25], which should significantly and differently affect the nature of the abnormal mass transfer of the atoms of various chemical elements. At the same time, there is a relationship between the rates of diffusion of impurities in liquid iron with the rates of their abnormal mass transfer in the melt under laser exposure.…”

Section: Resalts and Discussionmentioning

confidence: 99%

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About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

Губенко¹

2023

J. Mater. Sci. Technol. Res.

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The goal of this investigation was to research the wave nature of the formation of gradient and composite zones near non-metallic inclusions during laser treatment of the steels. The materials for investigation were commercial steels containing different non-metallic inclusions. The specimens of different steels were exposed to laser beaming on the installations GOS-30M. The research methods were applied: petrography, X-ray microscopy (MS-46 Cameca, "Nanolab - 7") and optical microscopy (Neophot-31) to study steel matrix near non-metallic inclusions and to identify of the inclusions. Nanohardness of the steel matrix near inclusions ("Nano Indenter II") was analyzed. Peculiarities of wave saturation of the steel matrix by chemical elements of non-metallic inclusions during laser action were investigated. It was shown the role of wave relaxation of stresses in the formation of cascade type structure of steel matrix near non-metallic inclusions. The features of the formation of gradient and micro composite saturation zones of cascade type in a steel matrix under conditions of abnormal mass transfer from nonmetallic inclusions during laser processing are discussed. It has been established that the formation of gradient saturation zones with a cascade and “spot” distribution of elements and nanohardness is due to the wave nature of the relaxation of thermal and deformation stresses near non-metallic inclusions at the time of laser exposure. The difference in the rates of abnormal mass transfer of chemical elements of non-metallic inclusions into a steel matrix at the moment of laser melting is shown, which is associated with different solubility and mobility of the atoms of alloying elements in liquid iron.

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Section: Resalts and Discussionmentioning

confidence: 99%

Section: Resalts and Discussionmentioning

confidence: 99%

Section: Resalts and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

Губенко¹

2023

J. Mater. Sci. Technol. Res.

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“…If the core material is suddenly changed from iron to nickel or chromium, the density would remain practically constant, especially since the number of nucleons remains fixed. From [27], it appears that even the electrical conductivities will not differ by more than a factor of two (Chromium is not tabulated here, but unless it is extremely anomalous compared to the other metals whose electrical properties have been investigated in the molten state, similar conclusions will hold.) If we take the minimum allowable magnetic field to be ten times less than the present value, this cannot be the cause of inhabitability unless the conductivity changes by two orders of magnitude 2 .…”

Section: Iron and Lifementioning

confidence: 92%

The fine structure constant and habitable planets

Sandora

2016

J. Cosmol. Astropart. Phys.

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We use the existence of habitable planets to impose anthropic requirements on the fine structure constant, α. To this effect, we present two considerations that restrict its value to be very near the one observed. The first, that the end product of stellar fusion is iron and not one of its neighboring elements, restricts α −1 to be 145 ± 50. The second, that radiogenic heat in the Earth's interior remains adequately productive for billions of years, restricts it to be 145 ± 9. A connection with the grand unified theory window is discussed, effectively providing a route to probe ultra-high energy physics with upcoming advances in planetary science.

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“…An experimental study of degradation processes was carried out on test structures using oscillograms of the U (t) inclusion [8,9]. It has been established that degradation processes are associated with contact fusion at the aluminum-silicon interface (melting point of the eutectic system of the Al-Si 577 ° C system) and by melting of the current-conducting layer.…”

Section: Methodsmentioning

confidence: 99%

Contact Melting of Aluminum-Silicon Structures under Conditions of Thermal Shock

Скворцов

Koryachko

2018

KEM

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The work is devoted to the study of contact melting in the Al-Si system, which is an aluminum film deposited on a silicon single-crystal substrate. The impulse action of high-density currents (j> 8.1010 A / m2) passing through an aluminum film is analyzed. It was found that under the considered electric heat loads in the system, the degradation processes associated with the appearance of a molten aluminum zone and subsequent contact melting in the metal-semiconductor system develop. From the analysis of contact melting processes, a technique for estimating the coefficients of multiphase diffusion in the system under consideration is a thin aluminum film-single-crystal silicon substrate.

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Structure and Properties of Molten Metals

Cited by 12 publications

References 187 publications

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

About Wave Nature of the Formation of Gradient and Microcomposite Zones Near Non-Metallic Inclusions During Laser Processing of the Steels

The fine structure constant and habitable planets

Contact Melting of Aluminum-Silicon Structures under Conditions of Thermal Shock

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