Study On Microstructures And Properties Of Hazelett Continuous Casting And Rolling Aluminum Alloys Plate

Hazelett continuous casting and rolling process is a new technology of the aluminum alloy plate production with short process characteristics, it is feed by molten liquid metal into the Hazelett continuous casting machine to be about 19mm thick continuous slab, and then directly continuous rolled to be about 2mm thick. Compared with traditional direct casting and hot rolling process(DC process), it eliminated casting large panel ingots, sawing head, milling surface, homogenization annealing, large amount of thermal processing of rough rolling and other multi-channel processes, With advantages of short process, energy saving, lower production cost. Yichuan Power Group is the first company introduced the technology in China, in order to fully understand the Hazelett continuous casting and rolling process and microstructures and properties of its products, This paper selected 3004,3003,5052 aluminum alloy, using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis (EDS) and other analytical tools, Through the tensile, bending, corrosion resistance and other performance testing, Studied microstructures and mechanical properties of Hazelett, DC process and twin-roll casting three different modes'products,research works and findings are as follows:(1) Studied microstructure characteristics and surface morphology of Hazelett continuous casting 3004 aluminum alloy.(2) Studied recovery and recrystallization of Hazelett continuous casted and rolled 3004 aluminum alloy. The results found that in 510℃insulation 10h can improve the second phase shape, content, uniformity of alloy composition, to obtain complete recrystallized structure, to improve the follow-up cold-rolling process performance.(3) In comparison with twin-roll casting and cold rolled 3003 aluminum alloy from Dengfeng, Studied the microstructure and mechanical properties of the Hazelett products, Researched the feasibility of Hazelett take the place of twin-roll casting to produce curtain wall plate, The results showed that Hazelett products (tensile strength 234.47MPa, elongation rate of 8.02%) have a similar tensile strength, better plastic processing performance than twin-roll casting and cold rolled products(tensile strength 239.94MPa, elongation rate of 5.45%), meet industry standards YS/T 429.1-2000 provisions of the mechanical properties:Tensile strength:110-177MPa, aluminum elongation:≥5%. So Hazelett can replace twin-roll casting process, eliminating the need of cold rolling and shorten the production cycle in order to reduce production costs.(4) In comparison with DC process and cold rolled 5052 aluminum alloy from Xintai,studied the microstructure and properties of the Hazelett products, the results showed that Hazelett products (tensile strength 216.2MPa, elongation rate of 14.26%) have higher strength and good plastic processing more than DC products (tensile strength 199.75MPa, elongation rate of 23.78%).Achieve GB/T3880.2-2006 "Wrought aluminum and aluminum alloy plates, sheets and strips for general engineering—Part 2:Mechanical properties" provisions:5052H32 of 0.5-1.5mm thickness tensile strength not less than 210-260MPa, elongation does not less than 6%.The corrosion test results shown that Hazelett and DC product have the similar corrosion resistance.