气-粉复合精炼方式对ZL205A净化效果的影响

Effects of Gas-powder Compound Refining Method on Purification of ZL205A

对ZL205A合金进行了不同顺序的熔剂(粉)和旋转喷吹(氩气)以及旋转喷吹内喷粉复合精炼,利用测氢仪、金相显微镜、拉伸试验机、扫描电镜分析了不同气-粉复合方式的净化效果。结果表明,熔剂能增大夹杂与熔体界面活性,降低铝液黏度,其与旋转喷吹氩气复合方式对ZL205A合金熔体除气除杂效果有较大影响;旋转喷吹内喷粉工艺取得了最佳净化效果,熔体氢含量从0.176 mL/(100 g)Al降到了0.087 mL/(100 g)Al,材料的屈服强度、抗拉强度和伸长率较未精炼合金分别提高了19.2%、18.3%和100%。

The compound refining of ZL205A alloy with flux(powder),rotating jet(argon)in different sequences and rotating jet(argon and powder)was carried out,and the purification effects of different gas-powder compound methods were compared and analyzed by hydrogen meter,metallography microscope,tensile testing machine and scanning electron microscope.The results indicate that the flux can increase the interfacial activity between inclusion and melt and reduce the viscosity of aluminum liquid.The combination of flux and rotating jet argon has a great influence on degassing and impurity removal of ZL205A alloy.The optimal purification effect is obtained by rotating jet,where the hydrogen content of melt is decreased from 0.176 mL/(100 g)Al to 0.087 mL/(100 g)Al,and the yield strength,tensile strength and elongation of the alloy are increased by 19.2%,18.3%and 100%,respectively,compared with those of unrefined alloy.