摘要
采用砂型铸造方法研究了线性电磁搅拌对高温合金Incoloy800凝固组织的影响,用电子探针分析了铸锭中溶质元素的分布规律。实验结果表明:在高温合金砂型铸造的凝固过程中施加线性电磁搅拌,能够细化铸锭的等轴晶组织,增加铸锭断面等轴晶的比例;在较低的磁感应强度下,铸锭的宏观偏析和微观偏析均比较严重。增强磁感应强度后,由线性电磁搅拌引起的对流加速了熔体中过热的耗散,缩短了凝固时间;另外对流充分混合了熔池内各部分熔体,使得溶质元素在铸锭中的宏观偏析和微观偏析得到改善,从而大幅度提高了铸锭质量。
The effect of linear electromagnetice stirring （L-EMS） on the solidification of structure superaUoy Incotoy800 was investigated in sand casting, and the solute element distribution in ingot was analyzed with electron probe micro-analysis （EPMA）. The results show that the sizes of equiaxed grains in the Incoloy800 ingot are refined, and the proportion of the equiaxed grains at a cross-section is increased. With low magnetic induction intensity, the serious macrosegregation and microsegregation exist in the ingot. With high magnetic induction intensity, the convection caused by L-EMS accelerates dissipation of overheat and the solidification time is shortened. In addition, the mixture of all melt zones is enhanced. As a result, the macrosegregation and microsegregation of solute element in the ingots are obviously improved.
出处
《铸造技术》
CAS
北大核心
2013年第4期440-443,共4页
Foundry Technology
基金
国家自然科学基金重点资助项目(50834009)
教育部科学技术研究重大项目(311014)
中央高校基本科研业务费专项资金资助(N090609001)
高等学校学科创新引智计划项目(B07015)
关键词
高温合金
电磁搅拌
枝晶组织
偏析
superalloy
linear electromagnetic stirring
dendrite structure
segregation
