磷变质后期工艺对高硅铝合金中初生Si的影响

Effects of the Later Processing Parameters on Phosphorus Modified Primary Silicon Phase in High Silicon Aluminum Alloy

借助光学显微镜和金相软件观察分析了A390铝合金中初生Si形貌,研究了熔体中实际P含量、浇注温度和冷却速度等后期工艺参数对初生Si变质效果的影响。结果表明,P显著细化初生Si,随着熔体实际P含量的增加初生Si细化效果越好;浇注温度对P变质效果也产生一定影响,浇注温度越高,P变质效果越好;冷却速率对P变质效果起关键作用,即使在优化的熔体实际P含量和浇注温度条件下,冷却速率较低时初生Si细化效果也不明显。

Effects of later processing parameters such as the real phosphorus（P）content in melt,pouring temperature and cooling rate on the refinement of primary silicon particle in A390aluminum alloy were investigated by OM（optical microscopy）and Image Plus software.The results demonstrate that P can significantly refine primary silicon morphology,and primary Si phase size is decreased with increasing in the real P content in melt.With the increase of pouring temperature,the P modification effects is improved increasingly.Cooling rate plays a key role in P modifying primary silicon,where refinement of primary Si phase in the alloy can be neglected with the low cooling rate even under the condition of optimized P content in melt and reasonable pouring temperature.