研究了钴基高温合金K40S在950℃和1000℃的循环氧化行 为.发现合金在950℃ 400 h以内的抗循环氧化性能较好.合金在1000℃氧化50 h以后因为 表面氧化膜剥落开始出现失重现象.在1000℃循环氧化初期的产物主要为Cr2O3，其次 为CoCr2O4和少量的CoO，400 h以后，Cr2O3基本剥落，合金表面由于Cr的损耗又生 成Cr2WO6、NiCr2O4以及挥发性的WO3氧化产物.添加Si和Mn元素使K40S合金抗循 环氧化性能明显地比不含Si和Mn元素的DZ40M钴基高温合金优越.
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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