Shi Chen, He Jiangnan, Liao Hua, Mao Daheng
Light Alloy Research Institute, Central South University, Changsha 410083, China.
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
Materials (Basel). 2022 May 18;15(10):3598. doi: 10.3390/ma15103598.
Aiming at the problem that melt inclusions in the casting process of 7085 aluminum alloy seriously affect the ingot quality, this study introduces ultrasonic bending vibration into the melt of the launder in the semi-continuous casting process of 7085 aluminum alloy and investigates the online purification effect of ultrasonic bending vibration on the melt of 7085 aluminum alloy through a metallographic analysis, SEM analysis, and EDS energy spectrum analysis. The results show that, under the action of the ultrasonic, the inclusions in the aluminum melt are transformed from a large number of elongated large inclusions with a size of more than 50 μm, and granular inclusions with a size of about 5-15 μm, into a small amount of smaller than 30 μm point-like small inclusions. In addition, the average area ratio of inclusions in the melted sample was reduced from 3.835 (±0.05)% to 0.458 (±0.05)%, and the residual refining agent in the aluminum melt was effectively removed. It was also found that under the action of ultrasonic bending vibration, the tiny inclusions in the melt aggregate with each other, and interact with the residual refining agent in the melt to further grow, and are attached to the inner surface of the ceramic cavity channel to be removed.
针对7085铝合金铸造过程中熔体夹杂物严重影响铸锭质量的问题，本研究将超声弯曲振动引入7085铝合金半连续铸造过程中流槽的熔体中，并通过金相分析、扫描电子显微镜（SEM）分析和能谱分析研究超声弯曲振动对7085铝合金熔体的在线净化效果。结果表明，在超声作用下，铝熔体中的夹杂物由大量尺寸大于50μm的细长状大夹杂物和尺寸约为5 - 15μm的颗粒状夹杂物，转变为少量尺寸小于30μm的点状小夹杂物。此外，熔体样品中夹杂物的平均面积比从3.835（±0.05）%降至0.458（±0.05）%，铝熔体中的残留精炼剂被有效去除。还发现，在超声弯曲振动作用下，熔体中的微小夹杂物相互聚集，并与熔体中的残留精炼剂相互作用进一步长大，附着在陶瓷腔体通道内表面而被去除。
