作　　者： ; ; ; ; ;

机构地区： 北京科技大学材料科学与工程学院

出　　处： 《材料热处理学报》 2008年第3期126-130,共5页

摘　　要： 通过模拟热处理实验研究了新型镍基粉末高温合金涡轮盘在过固溶线温度热处理过程中盘件不同部位冷却γ′相的析出特征,并采用中断冷却方式考察了γ′相在冷却过程中的发展以及合金强度的变化。结果表明:与盘缘部位析出的γ′相比较,盘心部位的平均尺寸和尺寸分布范围更大,形态更为复杂,晶界宽化更明显,而强度较低。在冷却过程中,盘心和盘缘部位的二次γ′相平均尺寸随中断温度的降低均线性增加,但盘心部位的长大速度更大。其中合金强度随冷却温度的减低呈非单调性变化(先降低后升高),这与γ′相在冷却过程的多阶段形核有关。 The precipitation behavior of γ′ phase precipitated during cooling at different locations of a new type powder metallurgy（P/M） nickelbase superalloy disk was studied by simulating heat treatment tests on a simulator, interrupted cooling tests were applied to investigate the development of γ′ precipitates and strength of the disk in the process of cooling. The results show that the γ′ precipitates with more complex shape at bore location exhibit larger and wider variation sizes compared with those at rim location. Wider grain boundary at bore location is observed, and ultimate tensile strength of disk bore is lower than that of disk rim. The mean size of secondary γ′ precipitates at bore and rim locations linearly increases with the decrease of interrupt temperature, and the growing rate at bore location is larger. The strength of the alloy is decreases firstly and then increases with decreases of the interrupt temperature, which is believed to associate with the multi-stage nucleation of γ′ precipitates during cooling process.

关 键 词： 镍基粉末高温合金 相 热处理 强度

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]