摘要
在保持固/液界面温度梯度不变的条件下,研究了不同熔体超温处理温度对DD3单晶高温合金凝固组织的影响,并利用DTA研究了合金熔体结构的变化.结果表明:合金熔体在1380—1650℃发生一系列的结构变化;当抽拉速率为50μm/s时,随熔体超温处理温度由1500℃升至1640和1780℃,合金一次枝晶间距由177μm分别减至150和125μm,枝干与枝间γ′相的尺寸减小,且枝间γ′相形貌变得规整.
The solidification microstructure of DD3 Ni base single crystal superalloy is studied under different melt superheated temperatures and constant solid/liquid interface temperature gradient. The DTA results show that there are a series of melt structure changes between 1380 ℃ and 1650℃. At withdrawn rate of 50 μm/s, the primary dendrite arm spacing is decreased from 177 μm to 150 μm and 125 μm when the superheating temperature is increased from 1500 ℃ to 1640 ℃and 1780 respectively, the γ′are refined in both dendrite core and interdendrite area, and the morphology of the latter trends to be uniform.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期59-63,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
DD3单晶高温合金
熔体超温处理
凝固组织
一次枝晶间距
γ′相
DD3 single crystal superalloy, melt superheating treatment, solidification microstructure, primary dendrite arm spacing, γ′ phase
