Abstract：The 2A14 aluminum alloy wheel hub forging stock was prepared by isothermal compound forging (isothermal multi-direction forging + isothermal die forging) followed by solid solution and aging treatment. The effects of isothermal compound forging on microstructure and mechanical properties of the alloy were investigated by optical microscopy, scanning electron microscopy (SEM) and mechanical property testing. The results show that there are dynamic recovery and dynamic recrystallization in isothermal forging process. With increasing the die forging temperature, the softening mechanism of the alloy gradually changes from dynamic recovery to dynamic recrystallization. The mechanical properties can be improved by increasing isothermal multi-direction forging passes. Under the same isothermal multi-direction forging, the mechanical properties of the alloy increase first and then decrease with increasing the isothermal die forging temperature. The alloy treated by isothermal multi-direction forging with 6 passes at 450 ℃ and isothermal die forging at 460 ℃ has the best mechanical properties with the tensile strength and the elongation of 491 MPa and 12%, respectively.
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2019, Vol. 24 
