Al-4P变质对Al-20Si合金组织和切削性能的影响

Effects of Al-4P Modification on Microstructure and Machinability of Hypereutectic Al-20Si Alloy

采用正交试验法,研究了Al-4P变质对Al-20Si合金显微组织和切削性能的影响,优化了改善Al-20Si合金切削性能的工艺参数。研究表明,Al-4P添加量对初生Si的影响最为显著、变质时间的影响次之、变质温度的影响最小,优化出的改善切削加工性能的工艺参数:Al-4P添加量为1%、变质温度为760℃、变质时间为1 h。经最优工艺处理后,初生Si变得细小、分散且圆钝化,平均尺寸由变质前的120μm减小到30μm左右,刀具耐用度提高,切削加工性能得到改善。

The effects of Al-4P modification on microstructure and machinability of hypereutectic Al-20Si alloy were investigated by orthogonal experiment, and the process parameters of improving hypereutectic Al-20Si alloy machinability were optimized. The results show that the added amount of Al-4P is the most significant impact on the primary silicon, then the modification time, modification temperature. The optimized process parameters of improving the A1-20Si alloy machinability were presented as fol lows., the addition of Al-4P of 1% at 760 ~C for 1 h. After modification treatment, the primary silicon becomes small with dispersed and round passivation, and the average size is reduce from 120μm to 30 um, so the tool life is increased and the machinability is improved.