Effect of Solidification Condition on Secondary Dendrite Arm Spacing of the A357 Alloy under Counter-pressure Casting
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2009年第1期
论文作者：米国发
文章页码：119 - 122
摘 要：The effect of counter-pressure casting parameters on secondary dendrite arm spacing （SDAS） of A357 alloy under different process parameters was studied. Quartz sand mould with chill can strongly decrease the SDAS. Reduced SDAS close to the mould bottom because of chilling was obtained. Pressure seems to have no apparent effect on the SDAS. In order to obtain casts with UTS ≥320 MPa, SDAS must be less than 55 μm, which means a local cooling rate VL≥0.23 ℃ /s.
米国发
School of Materials Science and Engineering,Henan Polytechnic University
摘 要：The effect of counter-pressure casting parameters on secondary dendrite arm spacing （SDAS） of A357 alloy under different process parameters was studied. Quartz sand mould with chill can strongly decrease the SDAS. Reduced SDAS close to the mould bottom because of chilling was obtained. Pressure seems to have no apparent effect on the SDAS. In order to obtain casts with UTS ≥320 MPa, SDAS must be less than 55 μm, which means a local cooling rate VL≥0.23 ℃ /s.
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