超声电磁复合场对AZ31B镁合金铸轧板带组织性能的影响

Effect of Ultrasound and Electromagnetic Field on Microstructure of Cast-rolling Magnesium Strip

利用水平式双辊铸轧机进行了AZ31B镁合金超声波电磁复合场板带的铸轧试验,成功试制出了厚3mm、宽200mm的AZ31B镁合金铸轧板,研究了超声波电磁复合场对铸轧镁合金板带金相组织性能的影响。结果表明,在AZ31B镁合金铸轧过程中施加超声波电磁复合场能够使晶粒细化,组织更加均匀,平均晶粒尺寸由不加超声波电磁复合场时的30～60μm减小至10～20μm;板带坯力学性能也得到有效改善,抗拉强度、屈服强度和延伸率分别提高了23.6%、43.2%、107.2%,硬度提高了10%。在此基础上探讨了超声波空化效应及电磁效应对铸轧镁合金板带组织细化的作用机制。

Experimental study on ultrasonic and electromagnetic roll-casting of AZ31B magnesium alloy was carried out using a self designed and installed twin roll continuous horizontal caster.3mm thickness and 200mm width of AZ31B magnesium alloy casting strips were produced successfully.The results show that the ultrasonic and electromagnetic field is transferred into roll-casting zone and results in a great decrease of the grain size,the average grain size has decreased to 10～20μm from 30～60μm; and also improved the mechanics properties of the AZ31B magnesium alloy sheet,the tensile strength and yield strength and elongation and hardness are improved by 23.6% and 43.2% and 107.2% and 10% respectively.On this basis,the mechanism of grain refinement during cast-rolling process with ultrasonic cavitation and electromagnetic field effect were discussed.