The Influence of Casting Velocity on Structure of Al Continuous Ingots

Abstract

The aim of paper was determination of influence of the casting velocity in horizontal continuous casting process on solidification phenomenon and next primary structure of aluminum ingots. In the range of studies was conducted the experiment concerning continuous casting of Al ingots with diameter 30 mm at velocity from 30 to 80 mm/min. Moreover was developed adequate to the real the virtual model of cooled water continuous casting mould, which was used in simulation of solidification process of Al continuous ingot, made in ANSYS Fluent software. In result was determined the influence of casting velocity and temperature of cooling water on position of crystallization front inside the continuous casting mould. While the shape and size of grains in primary structure of Al continuous ingots were determined on the basis of metallographic macroscopic studies. On the basis of the results analysis was affirmed that increase of casting velocity strongly influences on position of crystallization front and causes increase of temperature of ingot leaving the continuous casting mould. In result the increase of casting velocity supposedly leads to decrease of temperature gradient on crystallization front what creates coarse grains in primary structure of aluminum continuous ingots and caused low usable properties i.e. suitability to plastic deformation.

Recognition of sticker breakout in mould thermograph based on template matching

“…The one-dimensional temperature curve method mainly uses the temperature values of single or multiple thermocouples to establish logical judgment or intelligent models [3][4][5], such as neural networks and clustering analysis [6,7]. Although this method can predict a lot of breakouts, the true sticker breakout is easily missed if the temperature or mould level has a large fluctuation [8][9][10][11][12]. The temperature thermograph is a new method to recognize sticker breakout and the space-time characteristics of breakout are studied by researchers [13,14].…”

Archives of Metallurgy and Materials

“…All such operations are essentially aimed at obtaining high strength castings without casting defects. Conducting research on real objects is much more difficult due to the lack of visibility and high temperatures taking place there, therefore computer simulations are one of the frequently used methods of improving the casting process [1][2][3][4][5][6][7][8][9][10][11][12]. This requires the formulation of an appropriate mathematical model that takes into account the mutual influence of thermal and flow phenomena (complex model) [2,3,5,6].…”

Archives of Foundry Engineering

“…The value of temperature applied in the precipitation hardening of AlSi2Mn and AlCu4MgSi alloys, mainly in the stage of supersaturation disables combination of this treatment directly with the continuous casting process, for example by using a re-cooling system, because according to [20] the temperature of ingot after leaving the continuous casting mould equals to 120220C in the case of the stand to horizontal continuous casting used in the studies. 5.…”