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1
Content available Thermodynamic Description of Ternary Fe-B-X Systems. Part 7: Fe-B-C
Miettinen J., Visuri V.-V., Fabritius T., Vassilev G.
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 2
923--933
EN
Thermodynamic description of the Fe-B-C system in its iron-rich corner is developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C) database. The thermodynamic parameters of the binary sub-systems, Fe-B, Fe-C and B-C, are taken from earlier assessments modifying the B-C description. The parameters of the Fe-B-C system are optimized in this study using experimental thermodynamic and phase equilibrium data from the literature. Liquid, beta-rhombo-B and graphite phases are described using the substitutional solution model, while the ferrite (bcc), the austenite (fcc), the cementite (M3C) and the M23C6 phases are described with the sublattice model and the borides, Fe2B, FeB and B4C, are treated as stoichiometric phases. A good correlation was obtained between the calculated and the experimental thermodynamic and phase equilibrium data. The description is recommended to be used at the composition region of wt% C + wt% B < 15 and at temperatures below 2700°C.
2
Content available Thermodynamic Description of Ternary Fe-B-X Systems. Part 6: Fe-B-Ti
Miettinen J., Visuri V.-V., Fabritius T., Milcheva N., Vassilev G.
Archives of Metallurgy and Materials
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2019
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Vol. 64, iss. 4
1249--1255
EN
Thermodynamic optimizations of the ternary Fe-B-Ti system and its binary sub-system, B-Ti are presented. The thermodynamic descriptions of the other binaries, Fe-Ti and Fe-B, are taken from the earlier studies slightly modifying the Fe-Ti system assessment. The adjustable parameters of the Fe-B-Ti and B-Ti systems are optimized in this study using the experimental thermodynamic and the phase equilibrium data from the literature. The solution phases of the system are described using the substitutional solution model and the compounds (including borides) are treated as stoichiometric phases. The results show a good correlation between the calculated and measured thermodynamic and phase equilibrium data.
3
Content available Thermodynamic Description of Ternary Fe-B-X Systems. Part 5: Fe-B-Si
Miettinen J., Visuri V.-V., Fabritius T., Milcheva N., Vassilev G.
Archives of Metallurgy and Materials
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2019
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Vol. 64, iss. 4
1239--1248
EN
Thermodynamic descriptions of the ternary Fe-B-Si system and its binary sub-system, B-Si, are developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, V, Si, Ti, C) database. The thermodynamic parameters of the other binary sub-systems, Fe-Si and Fe-B, are taken from earlier assessments. Experimental thermodynamic and phase equilibrium data available in the literature has been used for the optimization of the thermodynamic parameters of the Fe-B-Si and B-Si systems. The solution phases are described using substitutional solution model and the compounds (silicides and borides) are treated as stoichiometric phases. The calculated and experimental thermodynamic and phase equilibrium data were found to be in good agreement.
4
Content available Thermodynamic Description of Ternary Fe-B-X Systems. Part 4: Fe-B-V
Miettinen J., Visuri V.-V., Fabritius T., Milcheva N., Vassilev G.
Archives of Metallurgy and Materials
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2019
|
Vol. 64, iss. 2
451--456
EN
Thermodynamic descriptions of the ternary Fe-B-V system and its binary sub-system B-V, are developed using experimental thermodynamic and phase equilibrium data from the literature. The thermodynamic parameters of the other binaries, Fe-V and Fe-B, are taken from earlier assessments slightly modifying the Fe-V description. The work is in the context of a new Fe-B-X (X = Cr, Ni, Mn, V, Si, Ti, C) database. The solution phases are described using substitutional solution model. The borides are treated as stoichiometric or semistoichiometric phases and described with two-sublattice models.
5
Content available Thermodynamic Description of Ternary Fe-B-X Systems. Part 3: Fe-B-Mn
Miettinen J., Lilova K., Vassilev G.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 4
1481--1485
EN
A thermodynamic optimization of the ternary Fe-B-Mn system is presented. The thermodynamic parameters of the binary sub-systems, Fe-Mn, Fe-B and B-Mn, are taken from earlier assessments slightly modifying the B-Mn system description. The thermodynamic parameters of the Fe-B-Mn system are optimized in this study using literature experimental thermodynamic and phase equilibrium data. The solution phases of the system are described using the substitutional solution model and the borides are treated as stoichiometric or semi-stoichiometric phases of the (A,B)pCq type described with the two-sublattice models.
PL
Przedstawiono termodynamiczny opis trójskładnikowego układu Fe-B-Mn. Parametry termodynamiczne dwuskładnikowych stopów Fe-Mn, Fe-B i B-Mn zostały zaczerpnięte z wcześniejszych opracowań, przy tym opis układu B-Mn został nieznacznie zmodyfikowany. Parametry termodynamiczne dla układu Fe-B-Mn zostały zoptymalizowane w tej pracy w oparciu o eksperymentalne równowagi fazowe i dane termodynamiczne zaczerpnięte z literatury. Roztwory stałe w układzie Fe-B-Mn opisano przy użyciu modelu roztworu substytucyjnego, a borki traktowane sa jako fazy stechiometryczne lub półstechiometryczne typu (A,B)pCq opisane przy użyciu modelu dwu podsieci.
6
Content available Thermodynamic Description Of Ternary Fe-B-X Systems. Part 2: Fe-B-Ni
Miettinen J., Vassilev G.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 2
609--614
PL
Opis termodynamiczny trójskładnikowych układów Fe-B-X. Część 2: Fe-B-Ni
7
Content available Thermodynamic Description of Ternary Fe-B-X Systems. Part 1: Fe-B-Cr
Miettinen J., Vassilev G.
Archives of Metallurgy and Materials
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2014
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Vol. 59, iss. 2
601--607
EN
A thermodynamic description of the Fe-B-Cr system is developed in the context of a new Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C) database. The thermodynamic parameters of the binary sub-systems, Fe-B, Fe-Cr and B-Cr, are taken from earlier assessments slightly modifying the Fe-B and B-Cr descriptions, and those of the ternary system are optimized in this study using experimental thermodynamic and phase equilibrium data from the literature. The solution phases are described using substitutional solution model. The borides are treated as stoichiometric or semi-stoichiometric phases and described with two-sublattice models.
PL
Przedstawiono termodynamiczny opis trójskładnikowego układu Fe-B-Cr w kontekście bazy danych dla układów Fe-B-X (X = Cr, Ni, Mn, Si, Ti, V, C). Parametry termodynamiczne dwuskładnikowych stopów Fe-Mn, Fe-B i Mn-B zostały są zaczerpnięte z wcześniejszych opracowań, przy tym opisy Fe-B i B-Cr zostały nieznacznie zmodyfikowane. Parametry dla układu Fe-Mn-B zostały zoptymalizowane w tej pracy w oparciu o eksperymentalne równowagi fazowe i dane termodynamiczne zaczerpnięte z literatury. Roztwory stałe opisano przy użyciu modelu roztworu substytucyjnego, a borki traktowane są jako fazy stechiometryczne lub półstechiometryczne opisane przy użyciu modelu dwu podsieci.
8
Self Mixing Interferometry I Nnoninsvasive Pulse Wave Velocity Measurement
Hast J., Myllylä R., Sorvoja H., Miettinen J.
Molecular and Quantum Acoustics
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2001
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Vol. 22
95-106
9
Some thermal-hydraulic aspects of reflooding of an overheated, partly degraded nuclear reactor core
Frid W., Miettinen J., Sjöberg A.
Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
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1999
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Z. 67
235--244
EN
In studies of postulated, unmitigated severe accidents in LWRs it is assumed that cooling of the reactor core is lost which leads to core uncovery and heat-up. core degradation and eventually melt-down of the core. Restoring water supply to the reactor core in order to prevent core damage and to terminate accident progression is the main objective of the accident management. In some Boiling Water Reactors it is necessary to consider a possibility that the reactor may become critical during the reflooding phase. The reason is that the melting of the control rods and their relocation from the core is likely to start before the melting and relocation of the fuel. The two-phase flow and heat transfer phenomena associated with reflooding and quenching of the reactor core are complex and not completely understood, especially under severe accident conditions due to high fuel temperatures and. In the case of recriticality, strong thermal-hydraulic transients when the core reaches critical conditions. In this paper, the two-phase flow and heat transfer phenomena during reflooding of an overheated, partly degraded core are discussed. The reflooding model developed for the RECRIT code is briefly described, as well as some validation against experimental data.
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