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利用电磁场的影响,生产铸轧合金板材,主要通过光学显微镜对7075合金的微观形貌和晶体尺寸进行研究。结果表明,同传统铸轧板材方式相比,670℃下交变振荡电磁场铸轧7075板材的枝晶严重被破坏,拉伸,细化和等轴化。同时,在静磁场条件下的铸板微观组织一定程度上细化和被拉伸,实验条件为励磁电流100 A。中心偏析带在直流磁场和交变振荡磁场条件下明显减轻,然而后者的影响效果更为突出。在表面和横截面处,7075板材硬度依次随着传统铸轧、静磁场铸轧和交变振荡磁场铸轧顺序增加。随着电磁强度增加,板材的强度和性能得到进一步改善。无论板材何处,升高温度都会使电磁场作用效果提高。
The use of electromagnetic fields, the production of cast-rolled alloy sheet, mainly through optical microscopy 7075 alloy morphology and crystal size of the study. The results show that the dendrite of 7075 slab at 670 ℃ is severely damaged, stretched, refined and equiaxed compared with the conventional cast slab. At the same time, the microstructure of the cast plate under the condition of static magnetic field is refined and stretched to some extent. The experimental condition is the excitation current 100 A. The center segregation zone obviously reduces under the conditions of DC magnetic field and alternating magnetic field, however, the latter effect is more prominent. At the surface and in the cross section, the hardness of 7075 plate increases with the order of traditional casting, static magnetic field casting and alternating oscillating magnetic field casting. As the electromagnetic strength increases, the strength and performance of the sheet are further improved. No matter where the plate, raising the temperature will increase the effect of the electromagnetic field.