论文部分内容阅读
在铝合金半连续铸造过程中,由于冷却速率不同、温度分布不均,易导致液穴的产生。通过对液穴深度的测量,并截取铝合金铸锭某一位置1/4截面进行金相组织观察,分析了液穴对功率超声铝合金铸锭性能的影响。结果发现,液穴深度越深,功率超声作用越容易被削弱,液穴对功率超声作用后的铝液有静置保温作用。小坩埚试验证明静置保温时间越长,功率超声作用效果越容易削弱,且液穴深度对铸锭中心的金相组织影响最明显。
In the semi-continuous casting of aluminum alloy, due to different cooling rates, temperature distribution is uneven, easily lead to the generation of liquid holes. Through the measurement of the depth of the liquid hole and the interception of the aluminum alloy ingot at a position 1/4 of the microstructure observation, the influence of the liquid hole on the performance of the power ultrasonic aluminum alloy ingot was analyzed. The results showed that the deeper the depth of the liquid hole, the more easily the power ultrasonic effect is weakened, and the liquid aluminum has a static thermal insulation effect on the aluminum liquid after the power ultrasonic effect. The experiments of small crucibles showed that the longer the holding time, the easier the ultrasonic effect of power was weakened, and the depth of liquid hole had the most obvious influence on the microstructure of ingot.