High-Temperature Oxidation Behavior of the Co-Base Superalloy DZ40M in Air |
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| Authors: | Liu P S Liang K M |
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| Affiliation: | (1) Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;(2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, China |
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| Abstract: | The oxidation behavior of the Co-base superalloy DZ40M was studied in air at900–1100°C for times of up to 2000 hr. The results indicated thatthis alloy can grow a protective oxide scale at 900 and 1000°C duringisothermal oxidation, but not at 1100°C because of serious cracking andspalling of the oxide scales. Moreover, an internal-precipitate zone formedin the subsurface region of the alloy at all temperatures and times. Theprecipitates were rich in Cr in the vicinity of the alloy–scaleinterface and rich in Al deep in the alloy. The internal-precipitatemorphology changed from a granular to needlelike shape with increasingoxidation temperature. |
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| Keywords: | Co-base superalloy high-temperature oxidation kinetics structure |
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