【摘要】 本文研究一种定向凝固钴基高温合金中碳化物的形态和分布，结果表明，随凝固速度（ν）的增大，碳化物含量存在一极大值，ν＜７ｍｍ／ｍｉｎ时，碳化物量随ν增加，ν＞７ｍｍ／ｍｉｎ时，则反之，碳化物的尺寸则呈直线趋势下降。随距水冷板距离增大，碳化物量和尺寸均单调增加。碳化物量和尺寸随凝固参数的变化规律是合金性能变化的内在本质因素。更多还原

【Abstract】 The morphology and distribution of carbides in a directionally solidified cobalt-base superalloy have been studied. When the silidification rate,ν, was 7 mm/min the alloy contatined a maximum content of carbides. The carbide content increases as the increasing in ν up to 7 mm/min, and then, it decreases with the increase in νover 7mm/min, and the size of carbides reduces sharply. Both content and size of carbides increase nomotonously with the distance apart from the chilled plate.更多还原