Research On Process And Microstructure Of Electromagnetic And Ultrasonic Composite Energy-field Roll Casting1060Al Alloy Plate

Continuous roll casting has many prominent advantages, like short flow, low cost, high productivity and so on, but the product plate produced by continuous roll casting strip has apparent anisotropy, and the drawability of the product plate is poor than the plate produced by the hot rolled strip, thus the application of roll casting strip has been restricted in stamping products. Electromagnetic and ultrasonic composite energy field is first introduced in the1060aluminum alloy roll casting process in this paper to improve the microstructure and enhance the drawability of cast-rolled strip. This paper applies OM, TEM, XRD, SEM, EDS analysis, mechanical properties testing and drawing experiment to significantly study the evolution of microstructure of the roll casting1060aluminum alloy strip stock with composite energy in cold rolling and annealing process. The main content and outcomes are as follows:(1) Electromagnetic and ultrasonic energy field was exerted in the roll casting process, and1060aluminum strip stock had been successfully prepared. Effect of the composite energy field on microstructure of the cast-rolled strip stock had been studied. The results show that:after exerting the composite energy field on the strip stock, the composition segregation is reduced, the grain size is apparently decreased, the texture is diffused and the preferred orientation has not appeared.(2) The evolution of microstructure of the roll casting1060aluminum alloy strip with composite energy field in cold rolling process had been studied. The results show that:the dislocation of the cast-rolled strip with composite energy is more uniformly distributed, the orientation density of each deformation texture in the strip is apparently less than the conventional cast-rolled strip, and the type of strong B texture and weak C and S texture is gradually formed.(3) The effect of cold rolling and annealing process on annealing micro-structure of the strip with composite energy had been studied, and a set of optimum process parameters had been acquired. The results show that:the starting and ending recrystallization temperature of cast-rolled strip with composite energy field is low about50℃compared with the conventional cast-rolled strip. The annealing grain and the second phase of cast-rolled strip with composite energy field is smaller and uniformer, and the intensity of annealing texture is lower than the conventional cast-rolled strip.(4) The effect of the composite energy field on the mechanical properties and drawability of the1060aluminum alloy cast-rolled strip had been studied. The results show that:because of the composite energy field, the anisotropy of the cast-rolled strip is reduced, the earing ratio is lowered, and drawability of the cast-rolled strip is improved. When the cold deformation is80%and the annealing temperature is325℃, the cast-rolled strip with composite energy field appears the minimum anisotropy and the earing ratio is only1.7%. And the tensile strength, elongation and drawability are respectively increased23.7%,13.4%and54.1%compared with the conventional cast-rolled strip.