Analysis of atypical break out during a radial continuous casting of a slab in the straightening zone I. Numerical simulation of temperature field of a slab

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F13%3APU106017" target="_blank" >RIV/00216305:26210/13:PU106017 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Analysis of atypical break out during a radial continuous casting of a slab in the straightening zone I. Numerical simulation of temperature field of a slab

Popis výsledku v původním jazyce

Original numerical model was applied to the simulation of the transient temperature field of concast steel slab of two different chemical composition. The model solves the Fourier-Kirchhoffs equation of the temperature field of slab- crystallizer system respectively slab-ambient system with these different thermophysical parameters : thermal conductivity, specific heat capacity, density and enthalpy including their dependence on temperature. When both melts follow closely after each other, the critical state of so called break out occurs at a certain point secondary cooling zone of a caster. It is obviously a combination of surface defects. However different chemical composition of two steels and their mixing is apparently decisive. Therefore the temperature model has simulated the temperature history of every point of a cross-section of a slab during its movement through the whole caster from the level of the melt in the crystallizer to the cutting torch for both melts and and for their mixture (with average chemical composition). Calculation of the temperature field of a slab has focused mainly on the part of the slab before the break out and its surroundings. Calculation results were compared graphically by means of a graph of temperatures in characteristic points of the cross section, a graph of isotherms in the critical cross-section passing through the break out including isoliquidus and isosolidus, a graph of isotherms in longitudinal sections and a graph of increase in thickness of a solidified shell. The definition of the boundary conditions for all three variants of calculation are identical in all cooling zones. The results of the temperature field can establish a model of the chemical heterogeneity of steel supported by material expertise on samples taken from the break out.

Název v anglickém jazyce

Analysis of atypical break out during a radial continuous casting of a slab in the straightening zone I. Numerical simulation of temperature field of a slab

Popis výsledku anglicky

Original numerical model was applied to the simulation of the transient temperature field of concast steel slab of two different chemical composition. The model solves the Fourier-Kirchhoffs equation of the temperature field of slab- crystallizer system respectively slab-ambient system with these different thermophysical parameters : thermal conductivity, specific heat capacity, density and enthalpy including their dependence on temperature. When both melts follow closely after each other, the critical state of so called break out occurs at a certain point secondary cooling zone of a caster. It is obviously a combination of surface defects. However different chemical composition of two steels and their mixing is apparently decisive. Therefore the temperature model has simulated the temperature history of every point of a cross-section of a slab during its movement through the whole caster from the level of the melt in the crystallizer to the cutting torch for both melts and and for their mixture (with average chemical composition). Calculation of the temperature field of a slab has focused mainly on the part of the slab before the break out and its surroundings. Calculation results were compared graphically by means of a graph of temperatures in characteristic points of the cross section, a graph of isotherms in the critical cross-section passing through the break out including isoliquidus and isosolidus, a graph of isotherms in longitudinal sections and a graph of increase in thickness of a solidified shell. The definition of the boundary conditions for all three variants of calculation are identical in all cooling zones. The results of the temperature field can establish a model of the chemical heterogeneity of steel supported by material expertise on samples taken from the break out.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/GAP107%2F11%2F1566" target="_blank" >GAP107/11/1566: Analýza vlivu metalurgicko-materiálových a technologických parametrů kontinuálně litých ocelových předlitků na jejich kvalitu a na stabilitu pochodu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Hutnické listy

ISSN

0018-8069

e-ISSN

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Svazek periodika

2013

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

7

Strana od-do

53-59

Kód UT WoS článku

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EID výsledku v databázi Scopus

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