Corrosion Resistance of Hastelloy G-35 Nickel-Based Superalloy in Various Aggressive Media

A study is carried out on the effect of different surface native pre-oxides on hot corrosion of single crystal nickel-based superalloy at 900 °C. The effect of different oxides formed by different superalloys through pre-oxidation on hot corrosion is verified by normal hot corrosion and tube sealing experiments. The relationship between different surface oxides and the effect of different surface oxides layer on the hot corrosion properties of alloys are studied. In summary, the stable and dense surface pre-Al2O3 layer which can be obtained by pre-oxidation has an obvious positive effect on the improvement of superalloy hot corrosion resistance in reaction. In addition, the internal sulfides are analyzed in depth, and the relationship between Cr, Mo, O and S is discussed in detail.

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ATI 617

Alloy Digest ◽

10.31399/asm.ad.ni0766 ◽

2021 ◽

Vol 70 (1) ◽

Keyword(s):

Solid Solution ◽

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Pressure Vessel ◽

High Strength ◽

Heat Treating ◽

Nickel Based Superalloy ◽

Resistance To Oxidation

Abstract ATI 617 is a solid-solution strengthened, nickel-based superalloy that is typically used for parts requiring a combination of high strength and resistance to oxidation and carburization at temperatures up to 1100 °C (2000 °F). It is one of the few materials covered by the ASME Boiler and Pressure Vessel Code with design stresses up to 980 °C (1800 °F). This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-766. Producer or source: ATI.

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Evaluation of Hot Corrosion Resistance of Directionally Solidified Nickel-Based Superalloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.227.337 ◽

2015 ◽

Vol 227 ◽

pp. 337-340 ◽

Cited By ~ 2

Author(s):

Maria Sozańska ◽

Barbara Kościelniak ◽

Lucjan Swadźba

Keyword(s):

Corrosion Resistance ◽

Chemical Composition ◽

Hot Corrosion ◽

Turbine Blades ◽

Nickel Superalloy ◽

Material Surface ◽

Scale Morphology ◽

Directionally Solidified ◽

Nickel Based Superalloy ◽

Two Temperatures

The turbine blades made of directionally solidified nickel-based superalloys are exposed to combination of high temperature and aircraft environment, in which appear corrosive elements like sulphur, sodium and vanadium (hot corrosion). Corrosion resistance of superalloys is mainly dependent on their structure and chemical composition. Therefore, it is important to be aware of the correlation between the hot corrosion and changes in chemical composition and morphology of a surface of the material. The following paper presents the influence of sulphur on the microstructure of directionally solidified nickel-based superalloy. The research was carried out in Na2SO4 environment at two temperatures of 850oC and 900oC (below and above the melting point of salt, 884°C). The results show scale morphology on material surface and changes in chemical composition of surface of nickel superalloy.

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