Melt instabilities and the effect of surface tension on preventing edge serrations in melt overflow alloy strip casting

Download
1998-01-01
Kalkanlı, Ali
Braithwaite, Nick
Direct casting of metallic strip onto a single rotating chiller is possible by the displacement of liquid metal in a horizontal pouring channel against a vertically moving chiller surface. In the case where of a high liquid/vapour surface tension exists, the liquid cannot be dragged out of the melt pool by momentum transfer. The critical surface tension values for making strip in a series of 304 stainless steels as measured by a modified oscillating droplet technique, values 2.1-1.4 N m(-1). Surface tension values greater than these lead strip breakup. Casting of alloys with a low surface tension such as 1.3-1.1 N m(-1) at a wheel speed of 2.7ms(-1) can result instability waves such as Marangoni, Kelvin-Helmholtz and capillary waves. These waves result in the formation of edge serrations in the solidified strip. If the casting speed is sufficiently high to overcome these melt instabilities, strips can be produced with a smooth edge and uniform dimensions. In this paper the results of melt overflow direct strip casting experiments with different alloy and process conditions for strip dimensions up to 700 mu m and 40 mm wide are presented.
ISIJ INTERNATIONAL

Suggestions

Acoustic phonons scattering mobility and carrier effective mass in In6S7 crystals
Qasrawi, A. F.; Hasanlı, Nızamı (Elsevier BV, 2006-12-21)
Systematic dark electrical resistivity and Hall coefficient measurements have been carried out in the temperature range of 170-320 K on n-type In6S7 crystals. The analysis of the electrical resistivity and carrier concentration reveals the intrinsic type of conduction with an average energy band gap of similar to 0.75 eV The carrier effective masses of the conduction and valence bands were calculated from the intrinsic temperature-dependent carrier concentration data and were found to be 0.565m(0) and 2.020...
Charge transport mechanisms and density of interface traps in MnZnO/p-Si diodes
Tascioglu, Ilke; Farooq, W. A.; Turan, Raşit; ALTINDAL, ŞEMSETTİN; YAKUPHANOĞLU, FAHRETTİN (Elsevier BV, 2014-03-25)
MnZnO films were grown onto p-Si substrate by sol-gel spin coating method. The electrical properties of the diodes were investigated at room temperature via the current-voltage (I-V), capacitance-voltagefrequency (C-V-f), and conductance-voltage-frequency (G-V-f) methods by considering the effect of the interface trap density (D-it) and series resistance (Rs) of the diodes. The rectifying ratio (RR) values of undoped and Mn-doped ZnO/ p-Si diodes (at +/- 4 V) were found to be 275 and 2031, respectively. Mn ...
Temperature dependence of the isothermal bulk modulus of TiB2
Ozkan, H. (Elsevier BV, 2011-04-01)
The temperature dependencies of the isothermal bulk modulus of TiB2 above room temperature were calculated by using the equation for the Anderson- Gruneisen parameter (delta(T)) and its solution by Garai and Laugier (J. Appl. Phys. 101, 023514 (2007)). The present calculations utilize the relevant experimental data for the pressure derivative of the isothermal bulk modulus, K' as delta(T) in addition to the volume thermal expansion coefficients (alpha(V)). The temperature derivatives of the isothermal bulk ...
Effects of annealing temperature on the structural and optical properties of ZnO hexagonal pyramids
BACAKSIZ, EMİN; YILMAZ, ŞERİFE; Parlak, Mehmet; Varilci, A.; Altunbas, M. (Elsevier BV, 2009-06-10)
ZnO thin films were deposited on quartz substrate at 550 degrees C by using spray pyrolysis method and subsequently annealed between 600-900 degrees C with a step of 100 degrees C. The characterizations of the structural and optical properties of the films have been carried out by means of X-ray diffraction, scanning electron microscopy (SEM) and optical transmittance measurements. XRD ans SEM images indicated that annealing temperature did not play a great role on the microstructure of ZnO films. ZnO thin ...
Liquid steel flow in continuous casting machine: Modelling and measurement
Yavuz, Mehmet Metin (Informa UK Limited, 2011-08-01)
Single phase (liquid steel) and two-phase (liquid steel and argon bubbles) three-dimensional computational fluid dynamic and heat transfer models were developed for the continuous casting machines of ArcelorMittal. The computational domains include tundishes, slide gates, submerged entry nozzles and moulds. The effects of buoyancy, tundish design, tundish practices, nozzle design and caster practices on flow structure were investigated. Mathematical modelling is discussed in detail. In addition, submeniscus...
Citation Formats
A. Kalkanlı and N. Braithwaite, “Melt instabilities and the effect of surface tension on preventing edge serrations in melt overflow alloy strip casting,” ISIJ INTERNATIONAL, pp. 142–148, 1998, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46786.