|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||Wang: High Temperature Oxidation of the New Type γ'-strengthened Cobalt-base Superalloys
||Lei Wang, Yang Liu, Bo Gao, Xiu Song, Shuyu Yang
|On-Site Speaker (Planned)
The cyclic oxidation testing was carried out on γ′-strengthened Cobalt-base superalloys with different Ni content in air at a temperature range from 800℃ to 1000℃. The results show that the Co-base superalloys show excellent oxidation resistance at such high temperatures. At 900℃, the oxidation resistance of Cobalt-base superalloys is significantly better than that of Nickel-base superalloy K417G or and Cobalt-base superalloy DZ40M. And, no obvious effect of the Ni addition on the oxidation properties of the Co-base superalloys can be found. At 800℃, the spinel structure oxides riched in Co, Ni and Cr on the surface and the continuous Al2O3 in the inner oxide layer can protect the alloys avoiding the severe oxidation. At 900℃, pyknotic (Co, Ni)O layer with NaCl structure forms on the surface, and the oxide layers are rich in Cr, therefore the oxidation resistance of alloys keeps high.
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