Asymmetric cast-rolling of 1050 aluminum alloy strip under multi-energy field
(1. School of Materials and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of High Performance and Complex Manufacturing,
Central South University, Changsha 410083, China)
2. State Key Laboratory of High Performance and Complex Manufacturing,
Central South University, Changsha 410083, China)
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