摘要
采用高通量的合金设计方法设计一种新型镍基单晶高温合金CSU．B2，并对该合金进行了一系列的研究。结果表明：该合金在铸态下树枝晶分布均匀，枝晶间距约为500gm，没有三次枝晶出现。通过对合金进行固溶和时效处理，合金中的γ’析出相呈现方块状，平均颗粒尺寸为0．5～0．8μm。在1100和1150℃下对合金的抗氧化性能进行研究发现，试样单位面积质量随时间的变化遵循类抛物线的规律，在氧化层的下面都存在着γ’相消失的区域。最后对合金的高温拉伸性能进行了表征，在760℃时，合金的屈服强度为706MPa；在980℃时，合金的屈服强度为484MPa。在两个温度下，试样的断裂为两种不同的机制。
A new nickel-base single crystal superalloy named CSU-B2 was designed by high-throughput alloy design method and a series of investigations were done to characterize the superalloy. The results show that the primary dendrites are uniformly distributed and the spacing size in the as-cast alloy is about 500 μm, where tertiary dendrite is absent. After solution and ageing treatments, the γ＇ prime precipitates are cuboidal-shaped and the average size is 0.5-0.8 μm. The oxidation-resistance property of the new alloy is evaluated at 1100 and 1150 ℃, the results show that the oxide growth of the new alloy obeys the parabolic law for both under isothermal and cyclic oxidation, and there both have a y＇ free zone under the oxide scale. The yield strengths under the temperature of 760 and 980 ℃ are measured to be 706 and 484 MPa, respectively, and two different mechanisms govern the failure processes.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2015年第10期2695-2706,共12页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2012AA03A514)
国家自然科学基金资助项目(51401242
61271356
51205031
51301209)
关键词
镍基单晶高温合金
热处理
高温氧化
高温拉伸
nickel-base single crystal superalloy
heat treatment
high temperature oxidation
high temperature tensile
