This paper studied sizes and distribution of Fe-containing constituents in 3104 ingots, their breakage during subsequent rolling and the resultant influence on the final gauge sheet performance in ironing beverage cans. It was observed that coarse Fe-containing constituents had retained on the sheet surface from the ingot scalped by 7 mm per rolling face. They broke up during rolling by 7.5 times and mostly in reversing mill, but they still were coarse on the final gauge sheet that caused pitting formation on can side walls during ironing at body makers. The microstructure of the sheet rolled from 20 mm scalped ingot was fine and did not contain constituents over 20 μm in size that resulted in its robust performance at body makers. It was shown that Fe-containing constituents were extremely critical for the sheet microstructure and its subsequent ironing performance at body makers. The ingot scalping depth should be determined based on their sizes and distribution below the rolling faces to avoid coarse constituent remains on the sheet surface.
Research of structure and anisotropy of the mechanical properties of hot-and cold-rolled semi-finished products from Al-Mg-Li (1420 and 1424) and Al-Cu-Li (V-1461) alloys was conducted. Semi-finished products were made in industrial conditions by standard technologies. During the tension test ultimate strength, yield stress, elongation and coefficients of lateral strain in three directions (at 0°, 45° and 90° angles to the rolling direction) were determined in order to study the planar anisotropy. It was established that the main characteristic inherent to both the first generation of aluminium-lithium alloys (1420) and the subsequent ones (1424, V-1461) is a pronounced anisotropy of the mechanical properties including the characteristics of plastic strain. At the same time, as for most aluminium alloys, aluminium-lithium alloys are characterized by low values of the lateral strain coefficients. It leads to a number of negative consequences in the subsequent forming: distortion and dimensions alteration of parts, limitation of formability, metal losses due to overestimation of thickness and dimensions of blanks, weight increase of the construction.
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