铜水冷环表面状态对DD6单晶高温合金组织与性能的影响  

Effects of Chill-ring Surface Conditions on Solidification Microstructures and Stress Rupture Behavior of a Single Crystal Superalloy DD6

作　　者：乐献刚[1] 顾欣[1] 邹建波[1] 刘艳[1] 李建国[1] 马岳[2] 

机构地区：[1]中航工业沈阳黎明航空发动机(集团)有限责任公司 [2]北京航空航天大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2014年第11期1136-1139,共4页Special Casting & Nonferrous Alloys

摘　　要：以DD6高温合金为目标,研究了铜水冷环内壁表面状态对其凝固组织及持久性能的影响。结果表明,与未处理的光亮铜表面以及自然形成的沉积物水冷环内壁相比,水冷环内壁经过喷C粉处理后,单晶凝固过程中的辐射散热能力得到明显增强,温度梯度得到提高,一次枝晶间距变小,晶体生长方向与[001]偏离度变小,γ-γ′共晶含量降低,尺寸得到细化,使合金的持久性能得到提高。Influences of the chill-ring surface on the microstructures and stress rupture behavior of the DD6 single crystal superalloy were investigated. Through comparing with the shinning copper surface and the deposit surface of the chill-ring, the heat radiation ability can be enhanced with spraying carbon on the chill-ring surface, and the temperature gradient is improved. As a result, the primary dendrite arm spacing is decreased, and the angle between the single crystal growth orientation and the [001] ori- entation is decreased. In addition, the size and volume fraction of γ-γ′ eutectic are reduced, and the stress rupture behabior of the DD6 alloy is improve greatly.

关 键 词：DD6单晶高温合金 水冷环表面状态 辐射散热 凝固组织 持久性能 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG244[金属学及工艺—合金]