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以ZA27合金为对象,在熔体保温条件下,研究了超声波功率对ZA27合金凝固组织及力学性能的影响。利用金相显微镜、扫描电镜对试样的显微组织、断口形貌进行观察;测试了试样的硬度、磨损性和冲击韧性。结果表明:在500℃保温条件下,采用超声波处理的ZA27合金其显微组织中的晶粒得到细化;当超声波功率较低时,晶粒细化效果不明显,晶粒粗大、耐磨性和冲击韧性均较差;随超声波功率的提高,ZA27合金铸锭中等轴晶数量呈递增趋势且耐磨性、抗冲击性均得到明显提高。
Taking ZA27 alloy as an example, the effect of ultrasonic power on solidification microstructure and mechanical properties of ZA27 alloy was studied under the condition of melt insulation. The microstructure and fracture morphology of the samples were observed by optical microscope and scanning electron microscope. The hardness, wear and impact toughness of the samples were tested. The results show that the microstructure of ZA27 alloy treated with ultrasonic wave is refined under the condition of 500 ℃ heat preservation. When the ultrasonic power is low, the effect of grain refinement is not obvious, the grains are coarse and the wear resistance And impact toughness are poor. With the increase of ultrasonic power, the number of equiaxed grains in ZA27 alloy ingot increases with increasing wear resistance and impact resistance.