Effects of investment casting on the mechanical properties and microstructure of ZL210Aalloy at as-cast

solid solution and aged state were analyzed

and compared with those in sand mold casting and in metal mold casting.The experimental results show that the grain size of investment casting samples is the more coarse than that of ones in sand mold samples and in metal mold samples regardless of as-cast

solid solution or aged state.The tensile strength and yield strength of investment casting as-cast samples are slightly lower than those in sand mold samples and in metal mold samples

while the elongation is near to that of metal mold samples

however it is higher than that of sand mold samples no matter in as-cast state

solid solution state or aging state.The hardness value of the investment casting samples is higher than that of sand mold samples and metal mold samples.After solid solution

the tensile strenght

yield strenght

elongation and hardness are improved by 1.4、2.0、1.1times and by 1.2times

respectively.After aging treatment

the tensile strength

yield strength and hardness are further improved

increased by 2.2、4.4times and by 2.1times

while the elongation is near to that of as-casting samples with only 9%.