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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。
In this paper, the influence of solidification interface morphology on the solidification microstructure and solute segregation behavior of hot-corrosion single crystal nickel base superalloy was studied. The results show that when the shape of liquid-solid interface changes from cellular to dendritic, the distance between primary cells and solute segregation increase sharply, while the degree of dendrite solidification decreases with the increase of coagulation rate. Large, the solute segregation is more serious, in a rough branch of the tree trunk spacing to the maximum, a new high-chromium low-melting point eutectic structure was found in the γ / γ ’eutectic.