High-temperature corrosion of superalloys

Stringer, J.

doi:10.1080/02670836.1987.11782259

Cited by 167 publications

(50 citation statements)

References 6 publications

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“…2~ When the vapor pressure of Na2SO4 exceeds its dew point for given service conditions, condensation of a fused salt on the cooler turbine components may lead to passive or locally active attack of the surface. [21][22][23][24][25][26][27][28][29] For resistance to hot corrosion, an alloy or coating must form a slow-growing and dense protective oxide scale with limited solubility in Na2SQ. Determinations of the solubilities of several oxides in pure Na2SO~ have shown that Cr203 and A1203 are acidic oxides because their solubility minima occur at very high acidity.…”

mentioning

confidence: 99%

Chromium and Reactive Element Modified Aluminide Diffusion Coatings on Superalloys: Environmental Testing

Bianco

Rapp

Smialek

1993

J. Electrochem. Soc.

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The isothermal oxidation of reactive element (RE)-doped aluminide coatings on IN 713LC alloy substrates at ll00~ in air formed a continuous slow-growing ~-A1203 scale after 44 h of exposure. RE-free (reactive element-free) aluminide coatings were characterized by a cracked oxide scale which exposed an underlying voided coating surface. The cyclic oxidation behavior of Cr/RE-modified aluminide diffusion coatings on Ren~ 80 and IN 713LC alloy substrates, and of RE-doped aluminide coatings on IN 713LC alloy substrates, at ll00~ in static air was determined. Coatings deposited by the above pack (AP) arrangement, as opposed to the powder contacting (PC) arrangement, showed improved resistance to cyclic oxidation attack. RE-doped and Cr/RE-modified aluminide coatings exhibited considerably more adherent protective A1203 scales compared to undeped aluminide coatings. The hot corrosion behavior of Cr/RE-medified aluminide coatings on Ren~ 80 and Mar-M247 alloy substrates at 900~ in a 0.1% SO2/Q gas mixture also was determined. The Cr/RE-modified aluminide coatings provided better resistance to hot corrosion attack (i.e., thin film studies) than a commercial low activity aluminide coating. Coating lifetimes were strongly dependent on the chromium surface composition, since a mixed (A1, Cr)203 scale better resists attack by the molten salt.

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mentioning

confidence: 99%

Chromium and Reactive Element Modified Aluminide Diffusion Coatings on Superalloys: Environmental Testing

Bianco

Rapp

Smialek

1993

J. Electrochem. Soc.

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“…These features are known to drastically reduce the superalloy component life and reliability by consuming the material at an unpredictably rapid rate, thereby reducing the load-carrying capacity and potentially leading to catastrophic failure of components (Fig.2) [2][3][4]. Thus, the hot corrosion resistance of superalloys is as important as its high temperature strength in marine gas turbine engine applications [5][6][7][8]. Recent studies have shown that the high temperature strength materials are most susceptible to hot corrosion and the surface engineering plays a key role in effectively combating the hot corrosion problem [9][10][11][12][13].…”

Section: Fig 2 Failed Gas Turbine Blade Due To Type I and Ii Hot Comentioning

confidence: 99%

The Selection of Materials for Marine Gas Turbine Engines

Gurrappa¹,

Yashwanth²,

Gogia³

2012

Efficiency, Performance and Robustness of Gas Turbines

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“…Therefore, catastrophic failure of the components may occur due to this hot corrosion since the load-carrying ability of the material is reduced rapidly. Extensive studies have been conducted to investigate the phenomena of hot corrosion, especially in air-craft turbine engines 6,7,8 . Hot corrosion may be defined as accelerated attack of molten sodium salts and oxides mixture such as NaCl, Na2SO4 and V2O5 deposited from environment contaminants at high temperatures.…”

Section: Alloy Degradation At High Temperaturesmentioning

confidence: 99%

Alloys developed for high temperature applications

Basuki

Prajitno

Muhammad

2017

AIP Conference Proceedings

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Co-based alloys design based on first-principles calculations: Influence of transition metal and rare-earth alloying element on stacking fault energy AIP Conference Proceedings 1805, 060004 (2017) Abstract. Alloys used for high temperatures applications require combinations of mechanical strength, microstructural stability and corrosion/oxidation resistance. Nickel base superalloys have been traditionally the prime materials utilized for hot section components of aircraft turbine engines. Nevertheless, due to their limited melting temperatures, alloys based on intermetallic compounds, such as TiAl base alloys, have emerged as high temperature materials and intensively developed with the main aim to replace nickel based superalloys. For applications in steam power plants operated at lower temperatures, ferritic high temperature alloys still attract high attention, and therefore, development of these alloys is in progress. This paper highlights the important metallurgical parameters of high temperature alloys and describes few efforts in the development of Fe-Ni-Al based alloys containing B2-(Fe,Ni)Al precipitates, oxide dispersion strengthening (ODS) ferritic steels and titanium aluminide based alloys include important protection system of aluminide coatings.

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High-temperature corrosion of superalloys

Cited by 167 publications

References 6 publications

Chromium and Reactive Element Modified Aluminide Diffusion Coatings on Superalloys: Environmental Testing

Chromium and Reactive Element Modified Aluminide Diffusion Coatings on Superalloys: Environmental Testing

The Selection of Materials for Marine Gas Turbine Engines

Alloys developed for high temperature applications

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