摘要
The A356 aluminum alloy wheels were produced by thixo-forging combined with a low superheat casting process.The as-cast microstructure,microstructure evolution during reheating and the mechanical properties of thixo-forged wheels made from the A356 aluminum alloy were studied.The results show that the A356 aluminum alloy round billet with fine,uniform and non-dendritic grains can be obtained when the melt is cast at 635 oC.When the round billet is reheated at 600 oC for 60 min,the non-dendritic grains are changed into spherical ones and the round billet can be easily thixo-forged into wheels.The tensile strength,yield strength and elongation of the thixo-forged wheels with T6 heat treatment are 327.6 MPa,228.3 MPa and7.8%,respectively,which are higher than those of a cast wheel.It is suggested that the thixo-forging combined with the low superheat casting process is an effective technique to produce aluminum alloy wheels with high mechanical properties.
The A356 aluminum alloy wheels were produced by thixo-forging combined with a low superheat casting process. The as-cast microstructure, microstructure evolution during reheating and the mechanical properties of thixo-forged wheels made from the A356 aluminum alloy were studied. The results show that the A356 aluminum alloy round billet with fine, uniform and non-dendritic grains can be obtained when the melt is cast at 635 ℃ When the round billet is reheated at 600 ℃ for 60 min, the non-dendritic grains are changed into spherical ones and the round billet can be easily thixo-forged into wheels. The tensile strength, yield strength and elongation of the thixo-forged wheels with T6 heat treatment are 327.6 MPa, 228.3 MPa and 7.8%, respectively, which are higher than those of a cast wheel. It is suggested that the thixo-forging combined with the low superheat casting process is an effective technique to produce aluminum alloy wheels with high mechanical properties.
基金
financially supported by the Science and Technology Innovation Foundation of Guangzhou Research Institute of Non-ferrous Metals(2009A10)
the Guangdong Province Cooperation Project of Industry,Education and Academy(2012B090600051)
