利用超高梯度定向凝固装置,其液固界面前沿温度梯度达1000～1300 K/cm,研究了超高速定向凝固条件下,K10合金的超细柱晶组织,碳化物形态及分布的变化。经试验表明:定向凝固柱晶组织中,一次枝晶高度细化,二次枝晶退化甚至消失。碳化物呈方向性排列,形态由普通铸态下的岛状变成蠕虫状。 The ultrahigh-gradient directional solidification device was used to study the microstructure and distribution of the ultrafine column crystals and the distribution of the carbide in the K10 alloy under ultra-high-speed directional solidification at 1000 ~ 1300 K / cm. Experiments show that: the directional solidification columnar crystal structure, a dendrite height refinement, secondary dendrite degradation or even disappear. Carbides were oriented, the shape of the island from the normal cast into worm-like shape.