Effect of Technology for Modification with Calcium and Ree on Pipe Steel Nonmetallic Inclusion Morphology and Production Properties

Burmasov, S. P.; Murzin, A. V.; Dresvyankina, L. E.; Toporov, V. A.; Gudov, A. G.

doi:10.1007/s11015-016-0216-8

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…In various fields of science, industry and technology, materials doped with small additions of rareearth elements (REE) have been widely used. For various classes of materials, this doping leads to a change in their physical properties [1][2][3][4][5][6][7]. Since inception of induced radiation in erbium-doped glass in 1965, new high-tech industries have been formed: laser technology and optical communication systems that study glassy materials doped with rare-earth elements [8].…”

Section: Introductionmentioning

confidence: 99%

Manifestation of Сoncentration Quenching of Fluoroaluminate Glasses Doped with Erbium

Klinkov

Семенча

Tsimerman

et al. 2019

KEM

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Fluoroaluminate glasses of the composition 2Ва (РО3)2–98MgCaSrBaYAl2F14-xErF3, where x=0, 0.1, 0.5, 1.0 mol. % have been prepared by melt quenching technique and characterized by optical absorption, emission spectra and decay curve analysis. Measured transmission spectra indicate the high practical relevance of the composition of glasses under investigation for photonics and optoelectronics products. In the region of 500–700 nm, luminescence spectra with peaks at about 522, 550, and 665 nm were obtained. The positions of the luminescence bands have been described using an erbium ion energy scheme. The concentration dependences of the absolute quantum yield values for the series of Er3+-doped fluoroaluminate glasses were also established. The maximum value of absolute quantum yield was found for a sample with Er3+ concentration 0.21∙1020 сm-3. The main reason for reducing the values of absolute quantum yield is concentration quenching.

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Section: Introductionmentioning

confidence: 99%

Manifestation of Сoncentration Quenching of Fluoroaluminate Glasses Doped with Erbium

Klinkov

Семенча

Tsimerman

et al. 2019

KEM

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“…Эффективность использования РЗМ увеличивается, если перед их введением проведено глубокое раскисление и десульфурация стали кальцием и алюминием [5]. В настоящее время в лабораторных и промышленных исследованиях [6] установлено, что применение РЗМ на заключительных этапах рафинирования позволяет существенным образом снизить содержание кислорода и серы в стали [7,8], модифицировать неметаллические включения и структуру литой стали [9]. После введения РЗМ в стали остаются незна-чительные количества в основном комплексных глобулярных оксисульфидов [10,11].…”

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THERMODYNAMICS OF THE PROCESSES OF INTERACTION OF LIQUID METAL COMPONENTS IN Fe – Mg – Al – La – O SYSTEM

Михайлов¹,

Makrovets²,

Смирнов³

2018

Izv. vysš. učebn. zaved., Čern. metall.

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At the present time, rare-earth elements in metallurgy are used in the form of mischmetal – a rare-earth elements natural mixture (with atomic numbers from 57 to 71). It contains about 50 wt. % of cerium. The remaining elements are mainly lanthanum and niobium. The specific composition is determined by the ore deposit. Inconstant composition of the modifier containing rare-earth metals (REM) can significantly reduce its efficiency. Experimentally, for every branded steels composition the ratio of various REMs can’t be selected because of the high costs of obtaining technically pure rare-earth metals. The task of determining the each rare earth element optimum concentrations and complex ligature composition can be solved by thermodynamic modeling. In the framework of thermodynamic modeling, the interaction between magnesium, aluminum and lanthanum with oxygen in liquid iron is presented. And the thermodynamic model of steel deoxidation by these active metals composition is considered. On the basis of available literature data on the phase diagrams of the systems MgO – Al2O3 , MgO – La2O3 and La2O3 – Al2O3 , the coordinates of the invariant equilibria points in the system MgO – La2O3 – Al2O3 were determined. The phase diagram of the system MgO – La2O3 – Al2O3 was constructed. It made possible to establish all phase equilibria realized in the process of deoxidation of steel with magnesium, lanthanum and aluminum and to describe these phase equilibria by chemical reactions equations. The activity of the components in liquid oxide melts was determined using the theory of subregular ionic solutions, which takes into account the dependence of the coordination number of cations on the composition of the oxide melt. The activity of components in metal melts conjugated with oxide systems were determined by Wagner’s theory using the parameters of the first order interaction. Equilibrium constants values for the steel deoxidation reactions are installed indirectly by thermodynamic calculations. On the basis of the obtained data the components solubility surface in the metal melts of Fe – Mg – Al – La – O system was constructed, which allowed to determine the liquid metal composition regions associated with the corresponding oxide phase.

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Inclusions modification by rare earth in steel and the resulting properties: A review

Wang

et al. 2024

Journal of Rare Earths

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Effect of Technology for Modification with Calcium and Ree on Pipe Steel Nonmetallic Inclusion Morphology and Production Properties

Cited by 4 publications

References 1 publication

Manifestation of Сoncentration Quenching of Fluoroaluminate Glasses Doped with Erbium

Manifestation of Сoncentration Quenching of Fluoroaluminate Glasses Doped with Erbium

THERMODYNAMICS OF THE PROCESSES OF INTERACTION OF LIQUID METAL COMPONENTS IN Fe – Mg – Al – La – O SYSTEM

Inclusions modification by rare earth in steel and the resulting properties: A review

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