Oxidation Behavior in Air-steam Mixed Atmosphere at 1000℃ of Four Typical High-temperature Alloys for Gas Turbine
The use of doped hydrogen or pure hydrogen as fuel poses a severe test to the key struc-tural components of gas turbines,especially the resistance of materials to steam oxidation.The high-tem-perature steam oxidation behavior of 4 typical high temperature alloys,namely DD5,K447A,GH3230 and GH3536 for gas turbine in a mixed flow of air with 10％steam at 1000℃ was studied by means of mass change measurement and thermodynamic theoretical calculation.It follows that the GH3230 and K447A alloys showed an oxidation mass gain and followed a parabolic law,while the alloys DD5 and GH3536 showed oxidation mass loss on the contrary.The oxidation products formed on K447A and GH3230 alloy were mainly layered Cr2O3 and Al2O3 scales.The spallation of Al2O3 oxide scales occurred on the surface of DD5 alloy,while oxide volatilization was found on GH3536 alloy.In sum,the steam oxida-tion resistance of the four alloys may be ranked as following:K447＞GH3230＞DD5＞GH3536.
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维普
