摘要
对Ni_3Al基单晶合金IC6sx的表面进行吹砂变形处理;再在800—1260℃热暴露1—10 h,采用OM,SEM和EPM研究了IC6sx合金的再结晶行为.结果表明,合金再结晶开始形核的温度约1000℃,一次再结晶完成的温度为1200—1210℃.在1200—1240℃热暴露时的再结晶层厚度约为10μm,而在1260℃热暴露时增长到约23μm.再结晶在枝晶干长大的速度明显小于枝晶间,再结晶层和基体的枝晶干之间观察到一种由粗大条状γ′相和γ+γ′相构成的胞状转变结构,这是由于枝晶干中粗大的γ′相阻碍再结晶向基体内生长形成的.
The specimens of a Ni3AI base single crystal alloy IC6sx were cold worked by grit blasting and then heat treated in the temperature range of 800-1260 ℃ for 1 h to 10 h. The ex- perimental results showed that the initially recrystallized nucleation temperature was about I000 and the primal recrystallization completing temperature was between 1200-1210 ℃. It has been found that the recrystallized grain size increased significantly with increasing temperature. However, the thickness of recrystallized layer almost kept 10 #m in the temperature range of 1200-1240 ℃ for 1 h, and increased fast to about 23 #m in the temperature of 1260 ℃for 1 h. The results indicated that, different from the recrystailized behavior in most common Ni-based superalloys, the recrystal- lized grains in the interdendritic region grew faster than in the dendritic core. It was observed that a cellular transformation formed in the interface between recrystallized grain and the dendritic core.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期391-396,共6页
Acta Metallurgica Sinica
关键词
NI3AL
单晶合金
高温合金
再结晶
表面层
NisAl, single crystal alloy, superalloy, recrystalization, surface layer
作者简介
李亚楠，女，1983年生，硕士
Correspondent： HAN Yafang, professor, Tel： （010）82310088, E-mail： yfhan@buaa.edu.cn
