用Pb-Sn-Bi液态合金模拟了吹氩和施加静磁场时结晶器内弯月面处的流动现象, 观察磁场对吹氩引起的弯月面失稳的抑制作用. 结果表明, 施加磁场改变了Ar气泡通过弯月面的漂浮分布规律, 加强了气泡在水口和窄面之间的漂浮, 使Ar气泡在结晶器宽度方向上漂浮分布更均匀, 减小了水口附近由于大量气泡上浮对液面的扰动. 施加0.5 T磁场能对水口出流以及吹氩所产生的液面波动产生抑制作用. 由相似准则推得, 应用在实际连铸机上抑制吹氩板坯连铸结晶器内液面波动的合适磁场强度为0.36 T.
A more homogeneous microstructure and more alloying of alloys can be obtained by controlling segregation during solidification, so properties of alloys can be improved. For directional solidification (DZ) of turbine blades，a new nickel-base superalloy DZ68, which makes use of low-segregation, is developed. This superalloy can meet the need of engine operation under offshore condition. Besides the hot corrosion resistance, DZ68 possesses an outstanding property of the high-strength aero engine blade material. This paper mainly studies properties of mechanic and hot corrosion resistance. It is shown that DZ68 possesses an excellent performance of hot corrosion resistance similar to DZ38G（In738）and shows mechanical properties equivalent to DZ125.
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