熔速对GH4169合金电渣重熔凝固过程参数影响的数值模拟研究  

Numerical Simulation on Influence of Melting Rate on GH4169 Alloy in Electroslag Remelting Process

作　　者：梁强[1] 陈希春[2] 郭汉杰[3] 

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081 [2]钢铁研究总院高温材料研究所,北京100081 [3]北京科技大学冶金与生态工程学院,北京100083

出　　处：《铸造技术》2013年第8期1016-1020,共5页Foundry Technology

基　　金：国际科技合作与交流专项项目(2010BFR50590)

摘　　要：模拟了GH4169合金电渣重熔凝固过程参数的变化,分析了熔速变化对凝固过程参数的影响。模拟结果表明:凝固过程参数随熔速的增大逐渐增大,随冷却速度增大,沿重熔锭中心至边缘凝固过程参数逐渐减小;熔速≤0.06kg/s时不产生黑斑偏析;局部凝固时间、二次枝晶间距、Rayleigh数变化趋势一致,在判断凝固组织优劣方面是等同的。计算模拟结果与实验结果吻合良好,能够预测不同工艺条件下缺陷的产生及程度,能够设计和优化现有的工艺并改进钢锭质量。The changes of solidification process parameters of GH4169 alloy in electroslag remelting process were simulated using software MeltFlow. The influences of melting rate on the changes of solidification process parameters were analyzed. It is shown that the solidification process parameters increase gradually with the increase of melting rate, while decrease gradually with the increase of cooling rate from center to edge of the remelting ingot; the freckle segregation does not generate when the melting rate is not greater than 0.06 kg/s; the change trends of local solidification time, secondary dendrite arm spacing and Rayleigh number are consistent, and these parameters are equivalent in the judgment of solidification structure. The simulation results are well consistent with experimental results, which can predicte the generation and extent of defects in different process, can plan and optimize the qualities of ingot.

关 键 词：电渣重熔过程 数值模拟 局部凝固时间 二次枝晶间距 RAYLEIGH 

分 类 号：TG244.3[金属学及工艺—铸造]