中文摘要：

对喷射成形高温合金GH742y中碳化物相的类型、成分、数量、形貌、分布及稳定性进行了研究。结果表明：喷射成形高温合金GH742y的碳化物MC中M主要包括Nb和Ti元素,N能取代C的位置形成M（C,N）碳氮化物,呈多边形细小颗粒状弥散分布在晶界和晶内;碳氮化物具有高的热稳定性,经过高温固溶处理不发生分解,其数量、大小、形状没有发生明显变化;碳氮化物钉扎和拖拽晶界,引起晶界弯曲,限制晶界迁移,抑制了晶粒长大。

英文摘要：

The amount,composition,type,morphology,distribution and stability of MC carbide for spray formed superalloy GH742y were investigated. The result shows that carbide in GH742y enriches with Nb and Ti and M（C,N）forms after N instead of C partially. Polygonal granular carbonitride present at the grain boundaries and in grains,most of them are sub-micrometer. Carbonitride has good thermal-stability and hardly changes in its amount,size and morphology after 1250℃ solution treatment. It inhibits the movement of grain boundary and grain growth by pinning the grain boundary.