喷射成形GH742y合金的碳化物相  

Carbide in Spray Formed Superalloy GH742y

作　　者：许文勇[1] 李周[1] 袁华[1] 张勇[1] 刘娜[1] 张国庆[1] 

机构地区：[1]北京航空材料研究院先进高温结构材料国防科技重点实验室,北京100095

出　　处：《航空材料学报》2010年第2期7-10,共4页Journal of Aeronautical Materials

基　　金：国家重点基础研究发展计划(2010CB631205);航空科学基金(20095321006);国家自然科学基金(50701041)

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。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.

关 键 词：喷射成形 碳化物 晶粒长大 高温合金 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG146.1[金属学及工艺—金属学]