α-Cr在Incone1718合金中析出行为的微观分析  

The Microanalysis of Precipitation Behavior of α-Cr in Incone 1718

作　　者：王改莲[1] 吴翠微[1] 张麦仓[1] 董建新[1] 谢锡善[1] 

机构地区：[1]北京科技大学,北京1000083

出　　处：《稀有金属材料与工程》2002年第1期37-40,共4页Rare Metal Materials and Engineering

摘　　要：使用扫描电镜 (SEM)、透射电镜 (TEM)、X射线衍射 (XRD) ,研究了 DA718和标准热处理 718合金经过 5 93℃～ 6 77℃时效 5 0 0 h～ 2 0 0 0 h后α- Cr相的析出规律及其对合金性能的影响。结果表明 ,α- Cr经常与δ相在晶界共同析出 ,随着时效温度的提高和时效时间的延长 ,α- Cr析出数量增加。应力能够促进α- Cr的析出。α- Cr的析出是造成合金高温时效后冲击值降低的原因。The precipitation of α Cr phase and its efect on the mechanial properties of DA718 and Sandard 718 after thermal exposure at 593 677℃ 500 2000 hours were studied using SEM, REM and XRD. The results show that α Cr phase often precipitates in association with δ phase in grain boundaries. The amount of α Cr phase increases with increase of temperature and prolongation of thermal exposure time. The stress will accelerate the formation of α Cr phase. In addition, the impact energy drop was found to correlated with the precipitation of α Cr in grain boundaris.

关 键 词：Incone1718合金 Α-CR相 组织稳定性 析出 镍基高温合金 

分 类 号：TG132.32[一般工业技术—材料科学与工程]