Abstract
An Al-Mg strip without center segregation could be cast using a single-roll caster equipped with a scraper at speed of 40 m/min. The scraper was useful for flattening a free solidified surface and for cooling the solidification layer by pushing the solidification layer to the roll. Clad strips consisting of 1) an Al-Mn base strip and an Al-Mg overlay strip and 2) an Al base strip and an Al-Sn-Cu overlay strip could be cast using an unequal-diameter twin-roll caster equipped with a scraper at speeds of 30 m/min and 15 m/min, respectively. The base strip and overlay strip were strongly bonded at the interface between the base strip and the overlay strip. The elements of the overlay strip did not diffuse into the base strip. The scraper played two roles in the casting of the clad strip: prevention of the mixture of two kinds of molten metal and making the surface of the base strip a semisolid of high solid fraction.
Highlights
Al-Mg alloy strip cast using a twin-roll caster has center segregation [1]
A vertical-type tandem twin-roll caster (VTTRC) is shown in Fig. 3(a), and the unequaldiameter twin-roll caster equipped with a scraper (UDTRCS) is shown in Fig. 3(b) [4-8]
The Al-Mg strip without the center segregation could be cast at a high speed of 40 m/min using a singleroll caster equipped with a scraper
Summary
A scraper was proposed and attached to a single-roll caster to cast Al-Mg strip without center segregation [2,3]. The melt drag process uses a single-roll caster to cast a strip without center segregation. The scraper scribes the semisolid layer on the solidification layer, and the thickness distribution and the flatness of the free solidified surface are improved. The scraper was attached to an unequal-diameter twin-roll caster to cast clad strip [4,5]. The solidification layers (two strips) are strongly bonded free from oxide film In this manner, the scraper is very useful in the casting of both single strip and clad strip. The unequal-diameter twin-roll caster is suitable for scraper attachment and for casting of clad strip depending on the position and size of the rolls. The clad strip was cast using a vertical-type tandem twin-roll caster, and the strips cast by the two types of twin-roll casters were compared
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