Mould Flux Film between Mould and Steel Shell - Effect on Heat Flux and Defect Formation

2003 ◽  
Vol 74 (8) ◽  
pp. 480-484 ◽  
Author(s):  
Paavo Hooli
Keyword(s):  
Heat Flux ◽  
Defect Formation ◽  
Steel Shell ◽  
Shell Effect ◽  
Mould Flux

The Mould Flux Heat Conduction Performance Designing of High Carbon Steel for Thin Slab Continuous Casting

2014 ◽  
Vol 1033-1034 ◽  
pp. 1313-1316
Author(s):  
Hui Rong Li ◽  
Li Gen Sun ◽  
Li Qun Ai
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Carbon Steel ◽  
Continuous Casting ◽  
Orthogonal Experiment ◽  
High Carbon Steel ◽  
Thin Slab ◽  
High Carbon ◽  
Slab Continuous Casting ◽  
Mould Flux

Heat transfer of the mould flux between the mould and the strand is very complicated, especially for the high carbon steel thin slab continuous casting. In this research the orthogonal experiment has been carried out, and the results showed that: the effect for the heat flux form strong to weak is: R>Na2O>F>MgO>BaO. and in the experiment range, with the R increasing, when the R, Na2O content and the F- content are increasing, the heat flux would be decreasing; with the MgO content increasing, the crystallization temperature would getting fluctuant; with the BaO content increasing, the heat flux would getting fluctuant, when its content is around 6%, the heat flux is reach its summit.

Improved cold-finger measurement of heat flux through solidified mould flux

2017 ◽  
Vol 45 (6) ◽  
pp. 502-508 ◽  
Author(s):  
K. L. S. Assis ◽  
P. C. Pistorius
Keyword(s):  
Heat Flux ◽  
Cold Finger ◽  
Mould Flux

Surface Defect Formation in Steel Continuous Casting

2018 ◽  
Vol 941 ◽  
pp. 112-117 ◽  
Author(s):  
Matthew L.S. Zappulla ◽  
Brian G. Thomas
Keyword(s):  
Continuous Casting ◽  
Thermal Model ◽  
Defect Formation ◽  
Casting Process ◽  
Element Model ◽  
Steel Shell ◽  
Formation Mechanisms ◽  
Δ Ferrite ◽  
And Behavior ◽  
Longitudinal Cracks

Serious defects in the continuous casting of steel, including surface cracks and depressions, are often related to thermal mechanical behavior during solidification in the mold. A finite-element model has been developed to simulate the temperature, shape, and stress of the steel shell, as it moves down the mold in a state of generalized plane strain at the casting speed. The thermal model simulates transient heat transfer in the solidifying steel and between the shell and mold wall. The thermal model is coupled with a stress model that features temperature-, composition-, and phase dependent elastic-visco-plastic constitutive behavior of the steel, accounting for liquid, δ-ferrite, and γ-austenite behavior. Depressions are predicted to form when the shell is subjected to either excessive compression or tension, but the shapes, severity, and appearance differ with conditions. Cracks appearing without depressions are suggested to form in the lower ductility trough when the shell is colder but more brittle. The local thickness of the shell and austenite layer appears to have major effects as well. The model reveals new insights into the formation mechanisms and behavior of surface depressions and longitudinal cracks in the continuous casting process.

Mould flux film between mould and steel shell

2002 ◽  
Vol 29 (4) ◽  
pp. 293-296 ◽  
Author(s):  
P. O. Hooli
Keyword(s):  
Steel Shell ◽  
Mould Flux

scholarly journals Controllability of Radiative Heat Flux across Mould Flux Films by Cuspidine Grain Size

2011 ◽  
Vol 51 (10) ◽  
pp. 1587-1596 ◽  
Author(s):  
Masahiro Susa ◽  
Atsushi Kushimoto ◽  
Rie Endo ◽  
Yoshinao Kobayashi
Keyword(s):  
Heat Flux ◽  
Grain Size ◽  
Radiative Heat ◽  
Radiative Heat Flux ◽  
Mould Flux

scholarly journals Analysis of the Equilibrium State of Flux Powders in the Mould During Continuous Casting of Steel

2015 ◽  
Vol 60 (1) ◽  
pp. 263-268 ◽  
Author(s):  
P. Drożdż
Keyword(s):  
Continuous Casting ◽  
Equilibrium Composition ◽  
Steel Shell ◽  
Continuous Casting Of Steel ◽  
Protective Function ◽  
Mould Flux ◽  
Thermodynamic Conditions ◽  
Calculation Results ◽  
Steel Slabs

Abstract Mould fluxes in the continuous casting of steel perform a protective function against oxidizing effect of the atmosphere on liquid metal, reduce friction between the solidifying steel shell and the walls of the mould and regulate the transfer of heat to the mould walls. Their chemical composition is crucial as it impacts the determination of the characteristic temperatures. The paper presents calculation results of the equilibrium composition of the selected mould powders in thermodynamic conditions similar to the actual conditions during continuous casting of steel slabs based on FactSage. The calculations were verified by high temperature tests of mould flux powders.

Siphon Flows in Stratified Coronal Loops

1994 ◽  
Vol 144 ◽  
pp. 185-187
Author(s):  
S. Orlando ◽  
G. Peres ◽  
S. Serio
Keyword(s):  
Heat Flux ◽  
Scaling Laws ◽  
Flow Model ◽  
Supersonic Flows ◽  
Coronal Loops ◽  
Characteristic Parameters

AbstractWe have developed a detailed siphon flow model for coronal loops. We find scaling laws relating the characteristic parameters of the loop, explore systematically the space of solutions and show that supersonic flows are impossible for realistic values of heat flux at the base of the upflowing leg.

Xenon ion irradiation of superconducting YBa2Cu3O7 thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 92-93
Author(s):  
H. Watanabe ◽  
B. Kabius ◽  
B. Roas ◽  
K. Urban
Keyword(s):  
Defect Formation ◽  
Ion Irradiation ◽  
High Resolution Electron Microscopy ◽  
Structural Disorder ◽  
Flux Lines ◽  
Pinning Effect ◽  
Magnetic Flux Lines ◽  
Resolution Electron ◽  
Radiation Induced ◽  
Induced Defects

Recently it was reported that the critical current density(Jc) of YBa2Cu2O7, in the presence of magnetic field, is enhanced by ion irradiation. The enhancement is thought to be due to the pinning of the magnetic flux lines by radiation-induced defects or by structural disorder. The aim of the present study was to understand the fundamental mechanisms of the defect formation in association with the pinning effect in YBa2Cu3O7 by means of high-resolution electron microscopy(HRTEM).The YBa2Cu3O7 specimens were prepared by laser ablation in an insitu process. During deposition, a substrate temperature and oxygen atmosphere were kept at about 1073 K and 0.4 mbar, respectively. In this way high quality epitaxially films can be obtained with the caxis parallel to the <100 > SrTiO3 substrate normal. The specimens were irradiated at a temperature of 77 K with 173 MeV Xe ions up to a dose of 3.0 × 1016 m−2.

Rate of Sublimation of Ice by Radiative Heating in Freeze-Etching

1980 ◽  
Vol 38 ◽  
pp. 618-619
Author(s):  
Yeshayahu Talmon
Keyword(s):  
Heat Flux ◽  
Freeze Fracture ◽  
Constant Heat Flux ◽  
Radiative Heating ◽  
Constant Heat ◽  
Entire Sample ◽  
Simplified Method ◽  
Freeze Etching ◽  
Sublimation Rates ◽  
Fractured Surface

To bring out details in the fractured surface of a frozen sample in the freeze fracture/freeze-etch technique,the sample or part of it is warmed to enhance water sublimation.One way to do this is to raise the temperature of the entire sample to about -100°C to -90°C. In this case sublimation rates can be calculated by using plots such as Fig.1 (Talmon and Thomas),or by simplified formulae such as that given by Menold and Liittge. To achieve higher rates of sublimation without heating the entire sample a radiative heater can be used (Echlin et al.). In the present paper a simplified method for the calculation of the rates of sublimation under a constant heat flux F [W/m2] at the surface of the sample from a heater placed directly above the sample is described.

Sign in / Sign up

Export Citation Format

Share Document