Abstract:Technological parameters of asymmetric cast-rolling under multi-energy field were investigated on horizontal twin roll caster (d400 mm×500 mm), and their effects on structures and properties of 1050 strips were analyzed by comparing with traditional cast-rolling. Results show that when length of cast-rolling area is 70 mm, melt temperature of head box is 670 °C, cast rolling speed is 1.3 m/min, exciting current is 10 A, center frequency is (13±1) Hz, ultrasonic power is 200 W and ultrasonic frequency is (20±0.2) kHz, the 1050 strip with the best microstructure can be prepared successfully; its center segregated layer disappears; the average grain size is reduced by about 40%; the crystal grains are distributed evenly; micro segregation decreases obviously; the precipitated phases are distributed along the grain boundaries evenly; and the tensile strength, yield strength, elongation and micro-hardness of cast-rolled strip are improved by 22.6%, 23.66%, 38.75% and 9.90%, respectively.

Key words: aluminum alloy 1050; asymmetric cast-rolling; multi-energy field; microstructure; mechanical properties