Microheterogeneity and crystallization conditions of Fe-Mn melts

Чикова, О. А.; Sinitsin, N. I.; V’yukhin, V. V.; Chezganov, D. S.

doi:10.1016/j.jcrysgro.2019.125239

Cited by 8 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar anomaly in the temperature dependence of viscosity was observed in other melts [ 9 , 35 , 36 ]. The appearance of an anomaly in boron-containing melts was associated with the rearrangement of FeB- and Fe 2 B-based clusters, which transform with increasing temperature into Fe 4 B- [ 37 ] or Fe 3 B-based clusters [ 38 ].…”

Section: Multicomponent Meltssupporting

confidence: 82%

“…The appearance of an anomaly in boron-containing melts was associated with the rearrangement of FeB-and Fe 2 B-based clusters, which transform with increasing temperature into Fe 4 B- [37] or Fe 3 B-based clusters [38]. A similar anomaly in the temperature dependence of viscosity was observed in other melts [9,35,36]. The appearance of an anomaly in boron-containing melts was associated with the rearrangement of FeB-and Fe2B-based clusters, which transform with increasing temperature into Fe4B- [37] or Fe3B-based clusters [38].…”

Section: Multicomponent Meltsmentioning

confidence: 55%

See 1 more Smart Citation

Kinematic Viscosity ofMulticomponent FeCuNbSiB-BasedMelts

2021

View full text Add to dashboard Cite

The work investigated the temperature dependences of the kinematic viscosity for multicomponent melts of nanocrystalline soft magnetic alloys. It is shown that there is a linear relationship between the reduced activation energy of viscous flow Ea·(RT)−1 and the pre-exponential factor ν0. This ratio is universal for all quantities, the temperature dependence of which is expressed by the Arrhenius equation. It is shown that the activation energy of a viscous flow is linearly related to the cluster size on a natural logarithmic scale, and the melt viscosity increases with decreasing cluster size. The change in the Arrhenius plot in the anomalous zone on the temperature dependence of viscosity can be interpreted as a liquid–liquid structure transition, which begins with the disintegration of clusters and ends with the formation of a new cluster structure.

show abstract

Section: Multicomponent Meltssupporting

confidence: 82%

Section: Multicomponent Meltsmentioning

confidence: 55%

Kinematic Viscosity ofMulticomponent FeCuNbSiB-BasedMelts

2021

View full text Add to dashboard Cite

show abstract

“…Clusters represent groups of atoms with a certain chemical composition and arrangement of atoms relative to each other. The inhomogeneous structure of the molten metal manifests itself in the features of the temperature dependences of the physical properties, for example, the melt viscosity [12,13].…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Pipe Steel in the Liquid State

Цепелев

Starodubtsev

Tsepeleva

2021

Metals

View full text Add to dashboard Cite

The temperature dependences of the kinematic viscosity and surface tension of liquid pipe steel with different modes of melt preparation were investigated. A transition zone was found on the temperature dependences of the thermophysical properties, which separates the regions with different activation energies of viscous flow and surface tension. At the heating stage in the transition zone, the thermal decomposition of clusters based on cementite Fe3C occurs. As a result of the decomposition, free carbon atoms appear which tend to give a uniform distribution in liquid iron with increasing temperature. At a low content of alloying elements and impurities, a high-temperature melt should have a large-scale cluster structure, which provides a more uniform distribution of chemical elements. The melt after vacuum degassing has a narrow transition zone near 1920 K, in contrast to the wide transition zone of the melt without vacuum degassing. The wider transition zone is shifted to high-temperature and this shift is associated with the thermal decomposition of carbides and oxides. Studies have shown that heating liquid pipe steel above the temperature of the liquid–liquid structural transition makes it possible to obtain a more homogeneous structure with a more uniform distribution of alloying and impurity elements in the melt. The sharp drop in surface tension at temperatures above 1920 K in the melt without vacuum degassing is associated with the diffusion of free S and O atoms, which are released after thermal decomposition of sulfides and oxides.

show abstract