Effect of Counter Gravity Casting on Filling Behavior and Solidification Microstruc-ture of ZL205A Alloy
Taking"⊥"shaped and rod-shaped specimens as examples,the effect of casting process parameters on the filling behovior and solidification structure of ZL205A alloy castings under counter gravity conditions were investi-gated.The results indicate that thin-walled castings with an average wall thickness less than 3 mm exhibit desirable formability due to the smoother filling process of counter gravity differential pressure casting,while sharp corner struc-tures cannot be achieved.Increasing the pouring temperature or mold temperature can improve the filling performance of differential pressure casting thin-walled ZL205A alloy castings,and the former one has a more significant effect than the latter.Compared with low-pressure casting,differential pressure casting can significantly refine the grain size of ZL205A alloy,and increasing the pouring temperature or mold temperature can appropriately further refine the grain size,and the former one has a more significant effect than the latter.For ZL205A alloy castings with a certain cross-sectional thickness,when the cross-sectional thickness exceeds a certain amount,the filling performance is less affected by the mold temperature and gating system design during differential pressure casting,and increasing the mold temperature leads to more porosity defects in castings.
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万方数据
维普
