Ti含量对一种镍基单晶合金组织和持久性能的影响  

Effect of Titanium Content on the Microstructure and Stress Rupture Properties in a Ni-Base Single Superalloy

作　　者：刘丽荣[1] 金涛[1] 赵乃仁[1] 王志辉[1] 孙晓峰[1] 管恒荣[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《稀有金属材料与工程》2006年第11期1830-1834,共5页Rare Metal Materials and Engineering

摘　　要：研究了3种不同含Ti量单晶高温合金的铸态、热处理态组织及持久性能。结果表明:Ti含量对合金的微观组织和持久性能都有明显的影响。随着钛含量的增加,铸态合金枝晶间区域的共晶尺寸和含量明显增大、增多,枝晶间区域的面积也逐渐增大。热处理后,3种合金的枝晶干处的γ′相形态基本一致,都为规则的立方体γ′相,尺寸大约为400nm^500nm。随着钛含量的增加,合金的持久寿命略有降低,延伸率略有增加。The microstructures of as-cast and after heat treatment and stress rupture properties were investigated in a Ni-base single crystal superalloy with different contents of titanium. The results show that the microstructures and stress rupture properties will be influenced by addition of different contents of titanium. For the as-cast structure, with increasing of titanium, the size and amount of γ/γ′eutectic in interdendritic region increase obviously, at the same time, the area of interdendritic region is enlarged. After heat treatment, γ′phases in dendrite core in three alloys have nearly the same morphology with regular cubic shape and the size of 400 nm-500 nm. In our research range, with the increasing of titanium content, the stress-rupture life decreases a little and elongation increases slightly.

关 键 词：TI 镍基单晶高温合金 微观组织 持久性能 

分 类 号：TG139[一般工业技术—材料科学与工程]