Materials for Gas Turbines – An Overview

Muktinutalapati, Nageswara Rao

doi:10.5772/20730

Cited by 32 publications

(11 citation statements)

References 22 publications

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“…Therefore, nickel-based superalloys are widely used in the hot parts of gas turbines due to their excellent mechanical strength at high temperatures. In combustor components, where the main loading is strain-driven, inducing significant inelastic deformations in an extreme environment, nickel-based superalloys such as Hastelloy X, Haynes 230 and Inconel 617 are normally used, due to their good ductility and oxidation resistance at high-temperatures [49]. In the combustor, AM has also since several years been used for manufacturing of complete components [5] and for repairing burner tips [8].…”

Section: Gas Turbinesmentioning

confidence: 99%

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Lindström

2022

Linköping Studies in Science and Technology. Dissertations

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The first part of the research project, which resulted in the Paper I, Paper II and Paper III, has been funded by the Swedish Energy Agency and Siemens Energy AB (formerly Siemens Industrial Turbomachinery AB) through the research programme Turbines for Future Energy Systems (Turbiner för framtidens energisystem), the support of which is gratefully acknowledged. The remaining part of the project, resulting in Paper IV and Paper V, has been funded by Linköping University and Siemens Energy AB. First and foremost, I would like to thank my main supervisor Associate Prof. Daniel Leidermark for your patience, encouragement and enthusiasm, and for always taking time for discussions, guidance, or anything I have on my mind. Special thanks goes also to Lic. Eng. Daniel Nilsson for all support you have provided me with regarding testing, application near questions, and for making it possible for at least some of our work to be used in "reality". I would also like to thank my research group; Prof. Kjell Simonsson, Dr. Jan-Erik Lundgren and Associate Prof. Robert Eriksson for your valuable input and support through the project.In addition, I would like to thank all Ph.D. colleagues at the Division of Solid Mechanics for, most importantly, making the Ph.D. studies a lot more fun, but also for all valuable discussions. A special thanks goes to my office mate Jordi for all your help, both at office and outside of work.Last, but not least, I would like to thank my girlfriend Ida for all your support. As we started our Ph.D. journeys almost at the same time, it has been invaluable to have someone to discuss things with at any time. However, most importantly, thank you for making my time outside work much more joyful.

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Section: Gas Turbinesmentioning

confidence: 99%

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Lindström

2022

Linköping Studies in Science and Technology. Dissertations

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“…A good example is Inconel 738 which has great mechanical properties but also can be used at very high temperatures. Other well-known materials are steel alloys and Nimonic 90, Inconel 718 or Inconel 625 [25][26][27]. Inconel 738 was chosen as the construction material for the turbine disc discussed herein because it has the best mechanical properties.…”

Section: Materials Review and Their Selection Depending On Operating mentioning

confidence: 99%

Optimisation of stress distribution in a highly loaded radial-axial gas microturbine using FEM

Zych

Żywica

2020

Open Engineering

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AbstractThe article discusses the stress optimisation process of the highly loaded disc of a high-speed radial-axial microturbine. At the design stage, the strength optimisation is vitally important for these types of devices because they must withstand very high temperatures (600∘C in this case) and be capable of operating at high rotational speeds (96,000 rpm in this case). Calculations were made using a three dimensional FE numerical model. The optimisation process is strictly connected with the choice of materials — which in this case are Inconel 738 (nickel-cobalt super alloy) and silicon nitride. Several stress reduction methods were developed, which took into account the mass of the disc, the rotational speed of the rotor and the complex shape of the rear part of the disc. Numerical computations helped to choose the best optimisation method, which decreased maximum reduced von Mises stresses by about 45% (from 1,288 MPa to 705 MPa). The methods proposed in this article are universal and can be implemented in the design process of various high-speed radial-axial microturbines. This article could be of interest to scientists and engineers who deal with highly loaded microturbines, which are increasingly used in many industrial sectors.

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“…The use of conventional titanium alloys with low density (about half that of steel and superalloys), good mechanical properties both at room and elevated temperatures (up to about 600°C), corrosion resistance, and forgeability, have gone up from about 0% in 1950 to beyond 30% in various aeroengine fan and compressor (shafts, discs, blades, casings, etc.) parts [7][8][9][10] . In low-pressure turbine blades, the intermetallic TiAl alloys (Ti-48Al-2Cr-2Nb and other variants) with even lower density and superior elevated temperature properties compared to the conventional Ti alloys have replaced heavier superalloys [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Ti-containing High-Entropy Alloys for Aeroengine Turbine Applications

Canumalla¹,

Jayaraman

2023

Mat. Res.

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Sustained research in high-entropy alloys (HEAs) has presented opportunities for relatively lighter alloys, specifically the Ti-containing HEAs, having an excellent combination of properties, and a great potential to replace heavier superalloys. We adopted a novel data-driven methodology to sort and select Ti-containing HEAs from the literature for their potential applications in aeroengine turbines by applying multiple-attribute decision-making (MADM). The ranks of the alloys evaluated by diverse MADMs were consistent. The data-driven methodology identified the following top five Ti-containing HEAs:

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Materials for Gas Turbines – An Overview

Cited by 32 publications

References 22 publications

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Optimisation of stress distribution in a highly loaded radial-axial gas microturbine using FEM

Ti-containing High-Entropy Alloys for Aeroengine Turbine Applications

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