摘要
采用扫描电镜和透射电镜研究了DD6单晶高温合金叶片小角度晶界的铸态组织、热处理组织和长期时效组织。铸态小角度晶界组织中,粗大γ′相和块状共晶沿晶界析出;热处理小角度晶界组织中,晶界上有一薄层γ相,晶界两侧的γ′相立方化较好,但由于小角度晶界的存在,γ′立方体不完整;1070℃长期时效500h小角度晶界组织中,晶界上析出粒状碳化物,无TCP相析出,DD6单晶高温合金小角度晶界组织有很好的稳定性。
The as-cast, heat-treated and long-term aged microstructures of DD6 single crystal superalloy blades with low angle boundaries （LABs） were investigated with scanning electron microscope （SEM） and transition electron microscope （TEM）. The coarse ）, phase and bulk γ/γ′ eutectic precipitate along LABs in the as-cast microstructure. There is a thin layer of γ phase in the grain boundaries and imperfect cubic γ′ particle along grain boundaries in the microstructures after heat treatment. The granular carbide exists, but no TCP phase precipitates along grain boundaries after aging at 1070 ℃ for 500 h, and LABs of DD6 alloy exhibit good microstructure stability
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第12期2117-2120,共4页
Rare Metal Materials and Engineering
关键词
DD6
单晶高温合金
小角度晶界
组织
DD6
single crystal superalloy
low angle boundaries
microstructure
