摘要
以Al-1％Si合金为对象，分别使用两种不同功率的超声波发生器，在熔体保温的条件下通过改变两种不同的超声波施振参数（施振温度以及施振时间），研究了这两种参数对合金铸锭凝固组织的影响。结果表明，在保温条件下，以150W的超声渡发生器通过改变施振温度可以得到细小且分布均匀的等轴晶，最佳保温温度范围为684-654℃；另外，在684℃保温条件下，以2000W的超声波发生器通过改变施振时间也可以得到均匀分布的细小等轴晶组织，最佳施振时间为60s。在保温条件下，过高的施振温度以及过长的施振时间都会引起熔体内较大的热效应，使细小的晶核发生重熔，从而使得晶粒粗化。
The effect of solidified structure which is caused by two different ultrasonic vibration parameters （treating temperature and treating time） by choosing respectively two ultrasonic generators of different power in the Al-1% Si alloys were studied in the article. The results indicate that the 150 W generator can obtain refined and uniformly distributed equiaxed grain by changing treating temperature under the condition of melt holding, and the optimum temperature range is from 684 ℃ to 654 ℃ ; otherwise, the 2 000 W generator can obtain refined and uniformly distributed equiaxed grain by changing treating time under melt holding, and the optimum treating time is 60 s. Under the condition of melt holding, the heat effect which is caused by the excess treating temperature and treating time can remelt the refined nucleus to gain the coarse grain.
出处
《铸造技术》
CAS
北大核心
2009年第7期899-903,共5页
Foundry Technology
基金
教育部留学回国人员科研启动基金资助项目
编号:20071067
辽宁教育厅创新团队项目
编号:20081224
辽宁省自然科学基金资助项目
编号:20082177
