论文部分内容阅读
对Mg-3Ca合金熔体进行超声处理来研究超声功率、施振时间和施振温度对合金除气及凝固组织的影响。结果表明,采用超声波处理技术,可以有效去除Mg-3Ca合金熔体中的气体,从而提高铸锭的致密度。超声除气效果与施振功率、处理时间及处理温度密切相关。当施振功率过小、处理时间过短或过长及处理温度过高或过低均不会有良好的除气效果。熔体处理温度为:700℃,超声功率为150W,处理时间为120s时除气效果最好,除气率可达53.8%。另外,超声波在去除熔体中气体的同时,也使得铸锭的凝固组织变得细小、均匀。粗大的树枝晶不利于气泡的上浮和熔体补缩;而均匀、细小的等轴晶则有利于这一点。
The melt of Mg-3Ca alloy was sonicated to study the effect of ultrasonic power, the duration of vibration and temperature on the degassing and solidification of the alloy. The results show that the ultrasonic treatment technology can effectively remove the gas in the Mg-3Ca alloy melt, thereby increasing the ingot density. Ultrasonic degassing effect and the vibration power, processing time and processing temperature are closely related. When Shi Zhen power is too small, the treatment time is too short or too long and the treatment temperature is too high or too low will not have a good degassing effect. Melt processing temperature is 700 ℃, ultrasonic power is 150W, the treatment time is 120s, the degassing effect is the best, the degassing rate can reach 53.8%. In addition, the ultrasonic wave in the melt while removing the gas, but also makes the ingot solidified tissue becomes small and uniform. Large dendrites are not conducive to the bubble floating and melt shrinkage; and uniform, small equiaxed is beneficial to this.