Effects of Hot Spinning and Heat Treatment on the Microstructure, Texture, and Mechanical Properties of A356 Wheel Hubs
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A356 aluminum alloy is a representative Al-Si-Mg alloy with excellent castability, such as good fluidity, low linear shrinkage, and a low probability of thermal cracking, which can be utilized for thin-wall and complex part casting. It can obtain high-specific strength, good plasticity, and excellent impact toughness by heat treatment.[1–3] In addition, A356 aluminum alloy is commonly employed in the manufacturing of automobile wheel hubs and other parts because of its good welding properties, anti-corrosion performance and anti-fatigue performance.[4] The manufacturing methods for aluminum alloy wheel hubs usually include casting, forging, and cast-spinning, among which the cast-spinning method has been extensively employed for its high material utilization rate, high productivity, and flexibility for the production of wheel hubs of different
CHANGQING HUANG is with the School of Mechanical and Electrical Engineering, State Key Laboratory of High-performance Complicated Manufacturing and Light Alloy Research Institute, Central South University, Changsha 410083, China. Contact e-mail: [email protected] JIAXING LIU is with the School of Mechanical and Electrical Engineering and State Key Laboratory of High-performance Complicated Manufacturing, Central South University, Changsha 410083, China. Manuscript submitted June 13, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
specifications.[5] In general, heat treatment is performed after spinning to improve the strength (generally by T6 temper; solution treatment and aging). Due to the significant influence and complex action mechanism of the plastic deformation and heat treatment on the microstructure and properties of material, there are continuous studies dedicated to this field. Several studies concerning A356 a-Al primary dendrites, secondary dendritic arm spacing, eutectic Si, secondary phases (b-Al5Fe2Si and p-Al8FeMg3Si6) and fracture behavior have been published to characterize the evolution of the microstructure and mechanical properties of A356 aluminum alloy during the hot spinning process under the conditions of different reduction ratios.[6–8] Cheng et al.[9] investigated the influence of spinning on the wear and corrosion performance of A356 alloy, and the results showed that spinning deformation was beneficial for reducing wear rate and corrosion current density. There are a series of reports about the heat treatment of A356 aluminum alloy, which focused on the effects of heat treatment (T4, T5, and T6 tempers) on the microstructure, tensile performance, fracture mechanism, hardness, and damping ratio.[10–14] However, published research on the spinning of the A356 alloy has not studied the inhomogeneity of deformation in the material during the spinning process, although this largely impacts the material performance. In addition, most of the studies on the heat treatment of A356 focused on the as-cast material. The variation of the
microstructure and performance of the target material from the casting state to the spinning state, and from the spinni
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