High-temperature oxidation behavior of the Co-base superalloy DZ40M in air

被引：0
|
作者：
Liu, P.S. [1 ,2 ]
Liang, K.M. [1 ]
机构：
[1] Dept. of Mat. Sci. and Engineering, Tsinghua University, Beijing 100084, China
[2] Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China
来源：
| 2000年 / Kluwer Academic/Plenum Publ Corp, New York卷 / 53期
关键词：
Cracking (chemical) - High temperature properties - Morphology - Oxidation resistance - Precipitation (chemical) - Reaction kinetics - Spalling - Superalloys;
D O I：
10.1023/a:1004597405809
中图分类号：
学科分类号：
摘要：
The oxidation behavior of the Co-base superalloy DZ40M was studied in air at 900-1100 °C for times of up to 2000 hr. The results indicated that this alloy can grow a protective oxide scale at 900 and 1000 °C during isothermal oxidation, but not at 1100 °C because of serious cracking and spalling of the oxide scales. Moreover, an internal-precipitate zone formed in the subsurface region of the alloy at all temperatures and times. The precipitates were rich in Cr in the vicinity of the alloy-scale interface and rich in Al deep in the alloy. The internal-precipitate morphology changed from a granular to needlelike shape with increasing oxidation temperature.
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