摘要
在定向凝固固/液界面温度梯度及凝固速率保持恒定条件下,研究了熔体过热时间对Ni基DD3单晶高温合金凝固组织的影响.结果表明,当熔体超温处理温度为1640℃,过热时间由30 min增至60 min时,枝晶间距进一步减小,枝间γ相更加细小且规整,在此温度过热90 min时,将导致凝固组织粗化当熔体超温处理温度为1780℃,随过热时间由30 min延长至60 min时,枝晶间距与枝间γ′相都变大,且枝间γ′相不再规整.
Under the condition of the solidification rate and thermal gradient just ahead of solid/liquid interface unchanged, the influences of melt superheating time on the solidification mi- crostructure of Ni base DD3 single crystal superalloy are studied. The results show that when the melt superheating temperature is 1640 γ′ and the superheating time is increased from 30 min to 60 min, the finer dendrite structure and γ′ phase in interdendrite area are obtained, but the solidification microstructure is coarsened when the superheating time is 90 min; When the melt superheating temperature is 1780 ℃, with the increase of superheating time from 30 min to 60 min, the primary arm spacing and the size of γ′ phase in interdendrite area are increased, while the morphology of γ′ phase tends to be irregular.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期150-154,共5页
Acta Metallurgica Sinica
基金
国家重点基础研究发展计划资助项目2006CB605202~~
关键词
熔体过热时间
Ni基DD3单晶高温合金
凝固组织
γ′相
melt superheating time, Ni base DD3 single crystal superalloy, solidification microstructure, phase
