The effect of ruthenium on the intermediate to high temperature creep response of high refractory content single crystal nickel-base superalloys

Hobbs, R.A.; Zhang, L.; Rae, C.M.F.; Tin, Sammy

doi:10.1016/j.msea.2007.12.045

Cited by 75 publications

(29 citation statements)

References 29 publications

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“…34 A notable development for future superalloys was reported by the researchers, who proposed to control the Cr, Re, and Ru contents for enhancing the creep strength of the SC superalloys. [35][36] An addition of 3 % of the mass fraction of ruthenium (Ru) was found to improve the intermediate temperature/intermediate stress-creep behaviors of the SC Ni-based superalloys; however, the high-temperature creep strength at the intermediate stress was not found to be good. 35 The reduction in the g' volume fraction upon the addition of Ru appears to be the principal cause of its diminishing strengthening con- 36 examined the microstructural stability and creep resistance of an advanced SC superalloy, which had high contents of Cr (4.6 % of mass fraction), Re (6.4 % of mass fraction) and Ru (5.0 % of mass fraction).…”

Section: Future Alloys For Hotter Gtsmentioning

confidence: 99%

“…[35][36] An addition of 3 % of the mass fraction of ruthenium (Ru) was found to improve the intermediate temperature/intermediate stress-creep behaviors of the SC Ni-based superalloys; however, the high-temperature creep strength at the intermediate stress was not found to be good. 35 The reduction in the g' volume fraction upon the addition of Ru appears to be the principal cause of its diminishing strengthening con- 36 examined the microstructural stability and creep resistance of an advanced SC superalloy, which had high contents of Cr (4.6 % of mass fraction), Re (6.4 % of mass fraction) and Ru (5.0 % of mass fraction). Experimental results showed that high Re + Ru contents could promote the formation of the hexagonal d phase at 900°C; additional Cr and Re could enhance the precipitation of the TCP phase at 1100°C.…”

Section: Future Alloys For Hotter Gtsmentioning

confidence: 99%

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Energy-efficient gas-turbine blade-material technology – a review

Huda¹

2017

Mater. Tehnol.

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Energy-efficient gas turbines (GTs) with reduced emissions have significantly contributed to sustainable development. However, these advanced engines, operating at turbine inlet temperatures (TITs) as high as 1.600°C, require the development of highly creep-resistant materials for application in hotter-section components of GTs. This paper first reviews recent advancements in the development of creep-resistant superalloys and their microstructural control, including stable gamma-prime raft structures. Then a comparative analysis of recently developed SC superalloys is presented to enable GT designers to select appropriate materials for hotter energy-efficient GT engines. It is recommended to develop new creep-limited alloys based on the metals with higher melting temperatures (e.g., Mo and Nb alloyed with silicon); these future alloys are proposed as prospective candidates for hotter energy-efficient GTs. Keywords: energy-efficient gas turbines, gas-turbine blades, turbine inlet temperature, single-crystal superalloys Energetsko u~inkovite plinske turbine (angl. GT) z zmanj{animi emisijami so mo~no prispevale pri trajnostnem razvoju. Vendar pa ti napredni stroji, ki delujejo pri temperaturah do 1600°C v vstopnem delu turbine zahtevajo, za uporabo komponent v vro~em delu, razvoj materialov odpornih na lezenje.^lanek predstavlja prvi pregled trenutnega napredka pri razvoju na lezenje odpornih superzlitin in kontrolo njihovih mikrostruktur, vklju~no s stabilno zgradbo gama-prime. Predstavljena je analiza pred kratkim razvitih SC superzlitin, tako da je konstrukterjem GT omogo~ena izbira primernega materiala za bolj vro~e, energijsko u~inkovite GT stroje. Predlagan je razvoj novih zlitin z omejenim lezenjem, ki temeljijo na kovinah z vi{jo temperature tali{~a (npr. Mo in Nb legiran s silicijem); te bodo~e zlitine so predlagane kot perspektivne za bolj vro~e, energijsko u~inkovite GT. Klju~ne besede: energijsko u~inkovite plinske turbine, lopatice plinskih turbin, vhodna temperatura turbine, monokristalne superzlitine

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Section: Future Alloys For Hotter Gtsmentioning

confidence: 99%

Section: Future Alloys For Hotter Gtsmentioning

confidence: 99%

Energy-efficient gas-turbine blade-material technology – a review

Huda¹

2017

Mater. Tehnol.

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“…As this series varied only in the Ru content, the results show that Ru does not have a direct effect on the recrystallisation behaviour in this alloy series. It is known that Ru can reduce the stacking fault energy of the γ phase [12], however its effect on the susceptibility to recrystallisation of Ni-based superalloys appears to be insignificant.…”

Section: Effect Of Compositionmentioning

confidence: 99%

A study on the effect of composition, and the mechanisms of recrystallisation in single crystal Ni-based superalloys

Mathur

Jones

Rae

2014

MATEC Web of Conferences

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Abstract. The effect of composition on recrystallisation of single crystal Ni-based superalloys was studied in a series of alloys that vary systematically in composition. Following room temperature macro-indentation and subsequent annealing, alloys containing higher Co concentration showed greater susceptibility to recrystallisation, and this has been attributed to the effect on the γ solvus temperature and the stacking fault energy of the γ phase. Mo, W and Ru did not appear to influence the recrystallisation behaviour systematically, although high concentration of all these elements led to the highest recrystallisation. Moreover, with grain orientation mapping, it was found that the nucleating recrystallisation grains form in orientations similar to the deformed regions, and subsequently twin to form higher angle boundaries and proliferate further within the deformed microstructure. The effects of the interaction between grain boundaries and secondary phases, such as the γ and topologically close packed phases, were also studied.

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“…As efficiency is directly related to the turbine inlet temperature, the turbine efficiency is raised and emissions are decreased [2]. Besides the positive effects of Re on the deformation rate, it has been frequently reported that Re strongly decreases the alloy stability and promotes precipitation of brittle topologically close packed (TCP) phases [3][4][5][6][7][8]. TCP precipitation is highly undesirable and eventually limits the amount of Re that can be added to advantage: On the one hand Re, which preferentially enters the TCP-phases, is removed from the matrix [9,10] lowering the solution strengthening effect, while on the other hand the brittle and needle-like precipitates may grow to considerable size where they act as crack initiation sites [6,7,10].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ruthenium on Topologically Close Packed Phase Precipitation in Single-crystal Ni-based Superalloys: Numerical Experiments and Validation

Rettig¹,

Singer²

2012

Superalloys 2012 (Twelfth International Symposium)

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The suppression of topologically close-packed phases (TCP) in nickel-based single-crystal superalloys by the addition of ruthenium is modeled with a fully multicomponent mesoscale precipitation model based on the numerical Kampmann-Wagnermethod using thermodynamic CALPHAD-calculations. For the application of the model in ruthenium-containing superalloys, mobility assessments of the binary systems nickel-ruthenium (NiRu) and nickel-rhenium (Ni-Re) were performed to create a new mobility database. It is postulated that the dominating effect of ruthenium regarding more sluggish TCP-phase precipitation is a change of interface energy reducing the number of precipitates nucleating. The precipitation sequences occurring during TCPphase precipitation can be explained using CALPHAD thermodynamics.

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The effect of ruthenium on the intermediate to high temperature creep response of high refractory content single crystal nickel-base superalloys

Cited by 75 publications

References 29 publications

Energy-efficient gas-turbine blade-material technology – a review

Energy-efficient gas-turbine blade-material technology – a review

A study on the effect of composition, and the mechanisms of recrystallisation in single crystal Ni-based superalloys

Influence of Ruthenium on Topologically Close Packed Phase Precipitation in Single-crystal Ni-based Superalloys: Numerical Experiments and Validation

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