Ni-based superalloys for turbine discs

Furrer, David; Fecht, Hans Jörg

doi:10.1007/s11837-999-0005-y

Cited by 262 publications

(108 citation statements)

References 31 publications

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“…Ni-base oxide dispersion strengthened (ODS) superalloys are widely used in aircraft and advanced gas turbine engines due to their excellent mechanical property and environmental resistance at high temperature [1][2][3]. For example, conventional ODS superalloys such as MA 6000 and PM 3030 [4,5] show excellent creep resistance by combination of gamma prime precipitation strengthening at intermediate temperature and dispersion strengthening at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Ni-Based ODS Superalloy Powders During Horizontal Rotary Ball Milling

Lee¹,

Kim²,

Park³

et al. 2017

Archives of Metallurgy and Materials

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Microstructure evolution of Ni-based oxide dispersion-strengthened alloy powders with milling time is investigated. The elemental powders having a nominal composition of Ni-15Cr-4.5Al-4W-2.5Ti-2Mo-2Ta-0.15Zr-1.1Y 2 O 3 in wt % were ball-milled by using horizontal rotary ball milling with the change of milling velocity. Microstructure observation revealed that large aggregates were formed in the early stages of ball milling, and further milling to 5 h decreased particle size. The average crystalline size, estimated by the peak broadening of XRD, decreased from 28 nm to 15 nm with increasing milling time from 1 h to 5 h. SEM and EPMA analysis showed that the main elements of Ni and Cr were homogeneously distributed inside the powders after ball milling of 5 h.

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Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Ni-Based ODS Superalloy Powders During Horizontal Rotary Ball Milling

Lee¹,

Kim²,

Park³

et al. 2017

Archives of Metallurgy and Materials

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“…As an extraordinary class of metallic materials, Ni-base superalloys have been successfully implemented into advanced turbine engines for aerospace and land-based power generation applications [1][2][3][4][5][6]. Most polycrystalline Ni-base superalloys possess microstructures consisting of ordered intermetallic precipitates !…”

Section: Introductionmentioning

confidence: 99%

“…""), as well as controlled concentrations of refractory elements (W, Mo) to deliver further solid solution strengthening to the ! matrix and the precipitates [3,5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Much of these efforts have been dedicated towards optimizing the !/!"(!"") microstructure by enhancing the strength, microstructural stability and temperature capability of both the matrix and precipitates via iterative compositional variations [6][7][8]. Despite these substantial efforts, only modest improvements in physical and mechanical properties have been achieved in these conventional polycrystalline Ni-base superalloys.…”

Section: Introductionmentioning

confidence: 99%

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Polycrystalline &gamma(Ni)/&gamma'(Ni<sub>3</sub>AI)-δ(Ni<sub>3</sub>Nb) Eutectic Ni-base Superalloys: Chemistry, Solidification and Microstructure

Xie¹,

Helmink²,

Tin³

2012

Superalloys 2012 (Twelfth International Symposium)

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A novel type of !/!"-# eutectic polycrystalline Ni-base superalloy has been recently demonstrated to possess promising mechanical properties at 700~800 ˚C, yet much of our knowledge regarding this eutectic alloy system is still qualitative in nature. A matrix of alloys spanning a broad range of alloy compositions were examined to improve our understanding of various alloying effects on the solidification behavior and as-cast microstructure of multi-component !/!"-# eutectic alloys. While the volume fraction of constituent phases was observed to be closely related with the Nb concentration, it could also be effectively modified by additions of other elements. Solidus and liquidus temperatures of these !/!"-# alloys were also found to vary with different solute concentrations, with a general decrease in solidus temperature as solute content increases. Interestingly, Cr, Mo and W were found to induce similar changes on the solidification and microstructure of this eutectic system. Extensive comparison between these experimental results and Computherm Pandat predictions was carried out, which confirmed the reliability of Pandat in predicting the qualitative trends for this eutectic system. Although satisfactory agreement was found between the measured and calculated solidus temperatures, additional phase equilibria information of multi-component !/!"-# alloys is required to improve the predictive capability on other properties.

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“…They are commonly used to produce components exposed to extreme environmental conditions during their service life, such as aircraft and power-generation turbines, rocket engines, etc. [154,155]. However, the high prices of these alloys, compared with stainless steel, constitute a restriction in their industrial application.…”

Section: Discussionmentioning

confidence: 99%

Determining the elastic-plastic properties of metallic materials through instrumented indentation

Chang¹

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AgradecimientosPrimero, me gustaria agradecer a mis supervisores. Me gustaría expresar mi máximo aprecio hacia mi supervisor Dr. J. Ruiz-Hervias por guiarme y ayudarme durante estos años en el laboratorio. He aprendido de él, no solo en lo estrictamente académico, si no en su generosidad y en su mente positiva hacia la vida. Además, también quería agradecer a mi co-supervisor Dr. M. A. Garrido. Él ha jugado un papel muy significante en el inicio de mi vida académica. Sus ideas y su entusiasmo siempre me inspiraron y me motivaron. Sin su paciencia y su ayuda, nunca hubiera acabado esta tesis. ResumenEn los últimos años, y asociado al desarrollo de la tecnología MEMS, la técnica de indentación instrumentada se ha convertido en un método de ensayo no destructivo ampliamente utilizado para hallar las características elástico-plásticas de recubrimientos y capas delgadas, desde la escala macroscópica a la microscópica. Sin embargo, debido al complejo mecanismo de contacto debajo de la indentación, es urgente proponer un método más simple y conveniente para obtener unos resultados comparables con otras mediciones tradicionales. En este estudio, el objetivo es mejorar el procedimiento analítico para extraer las propiedades elástico-plásticas del material mediante la técnica de indentación instrumentada.La primera parte se centra en la metodología llevada a cabo para medir las propiedades elásticas de los materiales elásticos, presentándose una nueva metodología de indentación, basada en la evolución de la rigidez de contacto y en la curva fuerza-desplazamiento del ensayo de indentación. El método propuesto permite discriminar los valores de indentación experimental que pudieran estar afectados por el redondeo de la punta del indentador. Además, esta técnica parece ser robusta y permite obtener valores fiables del modulo elástico.La segunda parte se centra en el proceso analítico para determinar la curva tensión-deformación a partir del ensayo de indentación, empleando un indentador esférico. Para poder asemejar la curva tension-deformación de indentación con la que se obtendría de un ensayo de tracción, Tabor determinó empíricamente un factor de constricción de la tensión () y un factor de constricción de la deformación (). Sin embargo, la elección del valor de  y  necesitan una derivación analítica. Se describió analíticamente una nueva visión de la relación entre los factores de constricción de tensión y la deformación basado en la deducción de la viii ecuación de Tabor. Un modelo de elementos finitos y un diseño experimental se realizan para evaluar estos factores de constricción. A partir de los resultados obtenidos, las curvas tension-deformación extraidas de los ensayos de indentación esférica, afectadas por los correspondientes factores de constricción de tension y deformación, se ajustaron a la curva nominal tensión-deformación obtenida de ensayos de tracción convencionales.En la última parte, se estudian las propiedades del revestimiento de cermet Inconel 625-Cr 3 C 2 que es depositado en el medio de una a...

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Ni-based superalloys for turbine discs

Cited by 262 publications

References 31 publications

Microstructure Evolution of Ni-Based ODS Superalloy Powders During Horizontal Rotary Ball Milling

Microstructure Evolution of Ni-Based ODS Superalloy Powders During Horizontal Rotary Ball Milling

Polycrystalline &gamma(Ni)/&gamma'(Ni<sub>3</sub>AI)-δ(Ni<sub>3</sub>Nb) Eutectic Ni-base Superalloys: Chemistry, Solidification and Microstructure

Determining the elastic-plastic properties of metallic materials through instrumented indentation

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Ni-based superalloys for turbine discs

Cited by 262 publications

References 31 publications

Microstructure Evolution of Ni-Based ODS Superalloy Powders During Horizontal Rotary Ball Milling

Microstructure Evolution of Ni-Based ODS Superalloy Powders During Horizontal Rotary Ball Milling

Polycrystalline &gamma(Ni)/&gamma'(Ni<sub>3</sub>AI)-&delta;(Ni<sub>3</sub>Nb) Eutectic Ni-base Superalloys: Chemistry, Solidification and Microstructure

Determining the elastic-plastic properties of metallic materials through instrumented indentation

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Polycrystalline &gamma(Ni)/&gamma'(Ni<sub>3</sub>AI)-δ(Ni<sub>3</sub>Nb) Eutectic Ni-base Superalloys: Chemistry, Solidification and Microstructure