Abstract: Effect of the non-electromagnetic stirring ( non-EMS) and the EMS with 6 Hz and 50 ~ 200 A in 1 t electroslag remelting (ESR) process on solidification structure o£ alloy GH4169 (/% : 0.04C, 0.21 Si, 0.05Mn, 52. 85Ni, 19. 80Cr, 5.20Nb, 3.05Mo, 0.55Al, 1.02Ti) has been studied. Results show that the EMS may obviously fine grains of alloy, increase ratio of equiaxed crystal and decrease spacing between secondary dentritic arms ； but as stirring electric current intensity is >100 A, the eutectic structure in ESR ingot increases to reduce the plasticity of ingot; as the current intensity is 50 A with frequency 6 Hz, the ratio of equiaxed crystal is max and the spacing between secondary dentritic arms is minimum, the Laves phase content in center of ESR ingot is lowest and the alloy with minor eutectic structure to get excellent plasticity of alloy.

摘要： 研究了 1 t电渣锭重熔过程未加电磁搅拌和6 Hz,50 - 200 A电磁搅拌对GH4169合金(/% ：0.04C, 0.21Si,0.05Mn,52. 85Ni,19. 8OCr,5.20Nb,3.05Mo,0.55A1,1.02Ti)凝固组织的影响。结果表明，电磁搅拌可以显 著细化合金晶粒，增大等轴晶比率，降低二次枝晶间距;但当搅拌电流N100 A时，电渣锭的共晶组织增多,降低了 电渣锭的塑性;当电流为50 A,频率为6 Hz时，等轴晶比例最高，二次枝晶间距最小，电渣锭中心位置Laves相含量 最低,合金中共晶组织最少，合金塑性最好。

关键词: GH4169合金, 1t电渣锭, 电磁搅拌, 凝固组织, 二次枝晶间距, Laves相