摘要
在850℃和950℃(TCP相析出的敏感温度)对DD4单晶高温合金进行了1000h的长期时效,并采用定期取样的方法进行分析。结果表明:DD4单晶合金具有良好的组织稳定性,经过长期高温时效后未出现TCP相,与理论计算的结果相符。在850℃下,γ相的尺寸和形态无明显变化,持久性能也未发生明显变化。在950℃下,γ相的尺寸和形态有一定变化,导致持久性能下降。
This paper deals with DD4 single crystal superalloy at 850℃ and 950℃ for 1000 hours of prolonged ageing The experiments and analysis have been carried out by picking out samples every 200 hours The experimental results show that there isnt TCP in DD4 after 1000 hours prolonged ageing And the microstructure is stable The morphology and size of γ change no much after 1000 hours prolonged ageing at 850℃,but they change a little after 1000 hours prolonged ageing at 950℃resulting in decreasing about 35% of the high temperature stress rupture life
出处
《材料工程》
EI
CAS
CSCD
北大核心
1997年第11期9-11,共3页
Journal of Materials Engineering
关键词
单晶合金
长期时效
显微组织
高温合金
single crystal alloy prolonged ageing microstructure properties of stress rupture