【摘要】 研究了Ｓｉ对Ｋ４０Ｓ合金凝固过程及显微组织的影响．结果表明，随着Ｓｉ含量的升高，Ｋ４０Ｓ合 金凝固时界面生长由枝晶生长转向明显的内生生长；Ｓｉ元素主要在枝晶间或晶界偏析，但当 Ｓｉ含量升高到一定程度后，枝晶内的浓度逐渐升高而达到显著水平；Ｓｉ元素对合金中Ｃｒ、Ｎｉ、Ｗ 等元素的分布有影响，进而影响碳化物的形成更多还原

【Abstract】 The effect of Si on the solidification and microstructure of K40S superalloy was studied. It is shown that, with the increase of Si addition, interface grows by way of endogeneous growth instead of dendritic interface growth during the alloy solidification. Si can not only segregate in interdendritic or intergranular zones greatly, but also dissolve into the matrix noticeably. Si has great effect on the distributions of Cr.Ni. Win K40S superal loy, inflmencing the formation of carbide.更多还原