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高双,侯介山,杨飞,王常帅,周兰章.两种铸造镍基合金的高温氧化行为[J].稀有金属材料与工程(英文),2019,47(3):960~966.[Gao Shuang,Hou Jieshan,Yang Fei,Wang Changshuai and Zhou Lanzhang.High Temperature Oxidation Behaviors of Two Cast Ni-based Superalloys[J].Rare Metal Materials and Engineering,2019,47(3):960~966.]
High Temperature Oxidation Behaviors of Two Cast Ni-based Superalloys
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Received:August 03, 2017  Revised:October 31, 2017
Key words: Ni-based  superalloy, anti-oxidation  element, oxidation  kinetics, oxidation  mechanism
Foundation item:国家能源局项目(项目号NY20150102);国家自然科学基金资助(项目号No.51571191)
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Gao Shuang,Hou Jieshan,Yang Fei,Wang Changshuai and Zhou Lanzhang  
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      High temperature oxidation behaviors of cast K317 and K325 alloy at 900°C and 1000°C in air environment are contrastively investigated by TGA, XRD and SEM (EDS). The results show that K317 alloy has a superior oxidation resistance compared with K325 alloy. The kinetic curves of two alloys oxidized at 900°C for 100 h obey the parabolic rate law while those at 1000°C obey sectionally the parabolic rate law. The oxide structure of K317, from the top surface down to the base material, consists of NiO-TiO2-NiCr2O4 composite oxide, Cr2O3 oxide dense band and Al2O3 internal oxide. In comparison, internal oxidation is not observed in K325 alloy whose oxide layer is composed by two oxide layers: NiO-NiCr2O4-Nb2O5 composite oxide and Cr2O3 oxide layer. Serious MoO3 volatilization and oxide spallation take place in K325 alloy after the oxidation at 1000°C for 100h. In addition, the adhesion property of K325 alloy is worse than that of K317 alloy due to the occurrence of the micro-voids on the oxide layer/substrate interface.