Corrosion- and Hydrogen-Resistance of Heat-Resistant Blade Nickel-Cobalt Alloys

Balyts’kyi, A. I.; Kvasnytska, Yu. H.; Ivaskevich, L.M.; Myal’nitsa, H. P.

doi:10.1007/s11003-018-0178-z

Cited by 18 publications

(10 citation statements)

References 5 publications

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“…In [19], the influence of GTE fuel ash and hydrogen gas on mass loss due to long-term corrosion and mechanical properties of heat-resistant cast materials of blades CM-88U-VI, CM-90-VI and CM-104-VI was investigated. It was established that the level of sulfide-oxide corrosion resistance of the investigated alloys correlates with the chromium content.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Designing brazing filler metal for heat-resistant nickel alloys of new generation marine gas turbines

Kvasnytskyi,

Korzhyk,

Kvasnytskyi

et al. 2023

EEJET

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The object of research is the processes of the formation of brazed joints and the stressed state. The subject of research is structure, chemical composition, long-term high-temperature strength at a temperature of 900 °C, speed of high-temperature salt corrosion. Existing brazing filler metals have a high-temperature performance of 40–50 % of the performance of the SM93-VI and SM96-VI alloys. Despite this, brazing is the main technique of joining modern heat-resistant cast alloys. Therefore, the development of new brazing filler metals that ensure the formation of joints with increased long-term high-temperature strength is relevant. Ship gas turbine blades operate at a temperature of 900 °C. The purpose of the development of the new SBM-4 brazing filler metal is to achieve long-term high-temperature strength of brazed joints at a temperature of 900 °C at the level of 85–90 % of the strength of heat-resistant alloys SM93-VI and SM96-VI. A two-stage method was used in the development of SBM-4 brazing filler metal. At the first stage, the chemical composition of the brazing filler metal base was determined, taking into account the peculiarities of operating conditions of the blades of marine gas turbine engines and the achievements of materials science of heat-resistant alloys. At the second stage, the depressant and its necessary content were selected. Computer software was used to determine the distribution between the γ- and γ'-phases, taking into account the participation of each element in both dispersion and solid-solution strengthening. Rational limits of concentrations of alloying elements were determined. The criterion was the minimum susceptibility of brazing filler metal to the formation of brittle phases, taking into account the influence of chromium, rhenium, and tantalum concentrations on resistance to high-temperature salt corrosion and high-temperature performance. The long-term strength of SM93-VI and CM96-VI alloys brazed with SBM-4 brazing filler metal is 89–91 % of the strength of the base metal. Technologies of brazing and correction of casting defects have been introduced into production.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Designing brazing filler metal for heat-resistant nickel alloys of new generation marine gas turbines

Kvasnytskyi,

Korzhyk,

Kvasnytskyi

et al. 2023

EEJET

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“…Cobalt is a cheap metal that presents powerful colors in its ionic forms and therefore, it has been used as a basic element in ink since ancient periods [171,172]. Cobalt alloys are used in blades [173] and batteries [174]. Due to its accessibility, it is well explored in catalysis for many fields, such as cycloaddition reactions [175], polymerization [176], and C-C cross-coupling methods [177].…”

Section: Cobalt-catalyzed C-h Activationmentioning

confidence: 99%

On the application of 3d metals for C–H activation toward bioactive compounds: The key step for the synthesis of silver bullets

Carvalho¹,

Miranda²,

Nunes³

et al. 2021

Beilstein J. Org. Chem.

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Several valuable biologically active molecules can be obtained through C–H activation processes. However, the use of expensive and not readily accessible catalysts complicates the process of pharmacological application of these compounds. A plausible way to overcome this issue is developing and using cheaper, more accessible, and equally effective catalysts. First-row transition (3d) metals have shown to be important catalysts in this matter. This review summarizes the use of 3d metal catalysts in C–H activation processes to obtain potentially (or proved) biologically active compounds.

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“…The hydrogen could be removed and the ductility of the alloy regained by degassing at elevated temperatures. In more recent work, Balyts’kyi et al [122] has studied the hydrogen embrittlement of gas turbine blade single crystal cast alloys such as SM-104-VI, SM-90-VI, and SM-88U-VI at 30 MPa hydrogen pressure, at temperatures between 20 and 900°C. The negative effect of hydrogen decreased with increasing temperature, but the authors reported a measurable decrease in strength and plasticity of the alloys even at 900°C.…”

Section: Other Types Of Degradationmentioning

confidence: 99%

Materials challenges in hydrogen-fuelled gas turbines

Stefan

Talic

Larring

et al. 2021

International Materials Reviews

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With the increased pressure to decarbonize the power generation sector several gas turbine manufacturers are working towards increasing the hydrogen-firing capabilities of their engines towards 100%. In this review, we discuss the potential materials challenges of gas turbines fuelled with hydrogen, provide an updated overview of the most promising alloys and coatings for this application, and highlight topics requiring further research and development. Particular focus is given to the high-temperature oxidation of gas turbine materials exposed to hydrogen and steam at elevated temperatures and to the corrosion challenges of parts fabricated by additive manufacturing. Other degradation mechanisms such as hot corrosion, the dual atmosphere effect and hydrogen diffusion in the base alloys are also discussed.

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Corrosion- and Hydrogen-Resistance of Heat-Resistant Blade Nickel-Cobalt Alloys

Cited by 18 publications

References 5 publications

Designing brazing filler metal for heat-resistant nickel alloys of new generation marine gas turbines

Designing brazing filler metal for heat-resistant nickel alloys of new generation marine gas turbines

On the application of 3d metals for C–H activation toward bioactive compounds: The key step for the synthesis of silver bullets

Materials challenges in hydrogen-fuelled gas turbines

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