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Influence of sputtered nanocrystalline coating on Oxidation and Hot Corrosion of a Nickel-based Superalloy M951

Journal of Materials Science & Technology 2014年第9期30卷 867-877页

作者： Xinyue Wang Li Xin Fuhui Wang Shenglong Zhu Hua Wei Xiaolan Wang School of Materials and Metallurgy Northeastern University State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

The isothermal and cyclic oxidation behaviors in air and hot corrosion behaviors in Na2SO4 ＋ 25 wt% K2SO4 salt of M951 cast superalloy and a sputtered nanocrystalline coating of the same material were studied. Scanning electron microscopy, energy dispersive X-ray spectroscope, X-ray diffraction, and transmission electron microscopy were employed to examine the morphologies and phase composition of the M951 alloy and nanocrystalline coating before and after oxidation and hot corrosion. The as-sputtered nanocrystalline layer has a homogeneous y phase structure of very fine grain size （30-200 nm） with the preferential growth texture of （111） parallel to the interface. Adherent AI203 rich oxide scale formed on the cast M951 alloy and its sputtered coating after isothermal oxidation at 900 and 1000 ℃. However, when being isothermal oxidized at 1100℃ and cyclic oxidized at 1000 ℃, the oxide scale formed on the cast alloy was a mixture of NiO, NiAl2O4, Al2O3 and Nb205 and spalled seriously, while that formed on the sputtered coating mainly consisted of Al2O3 and was very adherent. Nanocrystallization promoted rapid formation of Al2O3 scale during the early stage of oxidation and enhanced the adhesion of the oxide scale, thus improved the oxidation resistance of the substrate alloy. Serious corrosion occurred for the cast alloy. The sputtered nanocrystalline coating apparently improved the hot corrosion resistance of the cast alloy in the mixed sulfate by the formation of a continuous Al2O3 and Cr2O3 mixed oxide layer on the surface of the coating, and the pre- oxidation treatment of the coating led to an even better effect.

关键词： M951 alloy sputtered nanocrystalline coating Oxidation Corrosion Pre-oxidation

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HOT CORROSION BEHAVIOR OF K38G ALLOY AND ITS sputtered nanocrystalline coating BY PRE-DEPOSITED SULFATE AT 900℃

引用

Acta Metallurgica Sinica(English Letters) 2002年第1期15卷 119-122页

作者： S.J. Geng Fuhui Wang S.L. Zhu W.T. Wu State Key Laboratory for Corrosion and Protection Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016 China

The sputtered nanocrystalline coating of K38G alloy was obtained by magnetron sput-tering. The hot corrosion behaviors of cast K38G alloy and its sputtered nanocrys-talline coating by pre-deposited 75wt%Na2SO4+25wt%K2SO4 at 900℃ were studied. The results indicated the occurrence of internal sulfidation in the cast K38G alloy with pre-deposited sulfattes of 0.8 and 3.0mg/cm2. However, the internal sulfidation was not observed in the coating with pre-deposited 0.8mg/cm2 sulfate. The hot corrosion resistance of K38G alloy was clearly enhanced through nanocrystallinzation, although the internal sulfides were still formed for the coating with sulfate deposit of 3mg/cm2. The relevant hot corrosion mechanism was also discussed.

关键词： K38G sputtered nanocrystalline coating hot corrosion

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