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Abstract The cyclic oxidation behavior of K40S,a kind of cobalt-base superalloy,with maximun temperatures at 950℃,1000℃ was studied .The alloy possesses excellent resistance when tested at 950℃ for 400 hours.At 1000℃,K40S exhibited weight loss behavior due to oxide scale spallation after 5 0 cycles of test.Primary oxide products at the early stage of oxidation are Cr 2O3,CoCr2O4 with a little amount of CoO.Nearly all of the formed Cr2 O3 were detached off after 400 thermal cycles.Other oxides such as Cr2WO6, NiCr2O4,volatile WO3 also began to develop due to depletion of chromiu m in the alloy surfaces.Silicon,manganese addition make K40S alloy more resis tant to cyclic oxidation than directionally solidified DZ40M alloy,which has sim ilar composition to K40S but contains no silicon,manganese elements in the a lloy.
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Received: 03 December 2001
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Corresponding Authors:
Fuhe Yuan
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