Detail publikace

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

KAVIČKA, F. ŠTĚTINA, J. SEKANINA, B. STRÁNSKÝ, K. DOBROVSKÁ, J. MAUDER, T. MASARIK, M.

Originální název

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

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

Concastslab, steel, chemical composition of steel, thermo-physical properties, temperature field, numerical model, breakout

Autoři

KAVIČKA, F.; ŠTĚTINA, J.; SEKANINA, B.; STRÁNSKÝ, K.; DOBROVSKÁ, J.; MAUDER, T.; MASARIK, M.

Rok RIV

2013

Vydáno

10. 4. 2013

ISSN

0018-8069

Periodikum

Hutnické listy

Ročník

2013

Číslo

2

Stát

Česká republika

Strany od

53

Strany do

59

Strany počet

7

BibTex

@article{BUT103006,
  author="František {Kavička} and Josef {Štětina} and Bohumil {Sekanina} and Karel {Stránský} and Jana {Dobrovská} and Tomáš {Mauder} and Miloš {Masarik}",
  title="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",
  journal="Hutnické listy",
  year="2013",
  volume="2013",
  number="2",
  pages="53--59",
  issn="0018-8069"
}