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中文摘要：
最容易溶解的层在基于 Ni 的单个水晶 superalloy 的方向性的团结期间形成了的表面的微观结构，尺寸，元素的作文和坚硬被学习。在扔的外部表面上最容易溶解的表面的形成机制也被讨论。金属 / 模子相互作用没在表面的形成起任何作用最容易溶解。表面的形成原因最容易溶解的层为团结收缩引起的排泄被归因于 interdendritic 剩余液体。
英文摘要：
The microstructure, size, elemental composition and hardness of the surface eutectic layer formed during directional solidification of a Ni-based single crystal superalloy were studied. The formation mechanisms of the surface eutectic on the outer surface of the casting were also discussed. The metal/mould interactions did not play any role in the formation of the surface eutectic. The formation cause of surface eutectic layer was attributed to the interdendritic residual liquid for excretion caused by solidi？cation shrinkage.
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