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采用低过热度铸造和触变锻造相结合的方法制备A356铝合金车轮,研究低过热度铸造A356铝合金坯料的组织、坯料二次加热组织演变规律和触变锻造车轮的组织与力学性能。结果表明:熔体在635°C浇注,可获得具有细小、均匀的非枝晶晶粒的A356铝合金坯料。坯料在600°C等温加热60 min后,非枝晶晶粒可转变成球形晶粒,在750 kN锻压力下半固态坯料可触变锻造成铝合金车轮。经T6热处理,A356铝合金车轮的抗拉强度和伸长率分别为327.6 MPa和7.8%,高于铸造铝合金车轮的拉伸力学性能。将低过热度铸造与触变锻造工艺相结合,可以制备具有较高力学性能的铝合金车轮。
A356 aluminum alloy wheel was prepared by a combination of low superheat casting and thixoforming. The microstructure and mechanical properties of the secondary heating microstructure and thixo-forging wheel of A356 aluminum alloy billets were investigated. The results show that the melt is cast at 635 ° C to obtain A356 aluminum alloy billets with small, uniform non-dendritic grains. The blank is heated isothermally at 600 ° C for 60 min, the non-dendritic grains can be transformed into spherical grains, and the semi-solid blank at 750 kN forging pressure can be forged into the aluminum alloy wheels by thixotropic forging. T6 heat treatment, the tensile strength and elongation of A356 aluminum alloy wheels were 327.6 MPa and 7.8%, higher than the tensile mechanical properties of cast aluminum alloy wheels. The low superheat casting and thixotropic forging process combined with high mechanical properties can be prepared aluminum wheels.