本文研究凝固界面形态对抗热腐蚀单晶镍基高温合金凝固组织与溶质偏析行为的影响。结果表明,当液-固界面形态由胞状向树枝状转化时,一次主干间距及溶质偏析程度急剧增大,而在树枝状凝固范围内则随凝固速度的增大而显著降低,一次主干间距愈大,溶质偏析愈严重,在一次主干间距达到极大值的粗树枝状组织中,在γ/γ′共晶组织前沿区域发现了一种高铬低熔点新型共晶组织。
The effect of solidification interface morphologies on microstructureand solute segregation behaviour of hot corrosion-resistant single crystal Ni-basesuperalloy has been studied. When the liquid/solid interface morphology transformsfrom cellular to dendritic, the primary arm spacing and the solute segregation in-crease drastically, yet decrease remarkably with the increase of solidification rate inthe range of dendrite solidified. The farther the primary arm spacing is, the moreserious the segregation of solute may be. In the structure of coarse dendrite of whichthe primary arm spacing reaches a maximum, a new high Cr eutectic structure withlow melting point is found in front of γ/γ′ eutectic.
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