AD730
            <sup>™</sup>
            ‐ A New Nickel‐Based Superalloy for High Temperature Engine Rotative Parts

Devaux, Alexandre; Picqué, B.; Gervais, Monique; Georges, Eric; Poulain, Thibault; Héritier, Philippe

doi:10.1002/9781118516430.ch100

Cited by 47 publications

(26 citation statements)

References 15 publications

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“…The very low time to failure (14 h) can explain this: for such a short test, oxidation did not have enough time to affect the creep properties. Even though the alloy's microstructural stability enables it to be used at higher temperatures (hence the coarse grains microstructure), AD730™ was initially designed to withstand temperatures up to 750 °C [3][4][5]. In order to get closer to such a temperature range and to assess the creep properties of this alloy in a wide range of temperatures, creep tests at 700 °C were conducted.…”

Section: Creep Behaviormentioning

confidence: 99%

“…For instance, the objective of original engine makers is to reach operating temperatures above 700 °C in the rim sections of high pressure turbine disks, a temperature range at which state of the art superalloys such as Alloy 718 cannot be used anymore [1,2]. AD730™ is a new nickel-based superalloy, developed by Aubert & Duval for turbine disks or seal ring applications, with the particularity of being less expensive than its direct challengers due to its chemical composition and its good workability, enabling it to be manufactured through the cast and wrought route [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

Thébaud

Villechaise

Cormier

et al. 2015

Metals

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High temperature creep and dwell-fatigue properties of the new nickel-based superalloy AD730™ have been investigated. Three microstructures have been studied in creep (850 °C and 700 °C ) and dwell-fatigue (700 °C stress control with trapezoidal signals, and dwell times ranging from 1 s to 3600 s): a coarse grains microstructure, a fine grains one, and single crystalline samples. The aim of this study is to assess the influence of the grain size on creep and creep-fatigue properties. It is demonstrated that fine and coarse grains microstructures perform similarly in creep at 700 °C , showing that the creep properties at OPEN ACCESS Metals 2015, 5 2237 this temperature are controlled by the intragranular precipitation. Moreover, both the coarse grains and the fine grains microstructures show changes in creep deformation mechanisms depending on the applied stress in creep at 700 °C . At higher creep temperatures, the coarse grains microstructure performs better and almost no effect is observed by suppressing grain boundaries. During dwell-fatigue tests at 700 °C , a clear effect of the mechanical cycling has been evidenced on the time to failure on both the coarse and the fine grains microstructures. At high applied stresses, a beneficial effect of the cyclic unloading to the lifetime has been observed whereas at lower applied stresses, mechanical cycling is detrimental compared to the pure creep lifetime due to the development of a fatigue damage. Complex creep-fatigue interactions are hence clearly evidenced and they depend on the pure creep behavior reference.

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Section: Creep Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

Thébaud

Villechaise

Cormier

et al. 2015

Metals

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“…• C [29][30][31]. However, many of its properties are unknown for advanced manufacturing applications and especially no quantitative data is available on γ′ dissolution kinetics in…”

Section: Introductionmentioning

confidence: 99%

Coarsening and dissolution of γ′ precipitates during solution treatment of AD730™ Ni-based superalloy: Mechanisms and kinetics models

Masoumi

Jahazi

Shahriari

et al. 2016

Journal of Alloys and Compounds

145

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The kinetics of γ′ size and volume fraction changes during solution treatment of the advanced Ni-based superalloy, AD730 TM are determined and the underlying mechanisms are investigated.High resolution Differential Thermal Analysis (DTA) and thermodynamic modeling were used to design and perform solution heat treatment experiments. Semi-analytical models are developed to describe the dissolution and coarsening processes. The results from the proposed models, supported by electron microscopy observations, indicate that coarsening occurs before complete dissolution takes place. Agglomeration is shown to be the governing coarsening mechanism for this alloy after calculation of the coefficients for both the Ostwald ripening and agglomeration mechanisms. Electron microscopy observations revealed that the early stages of agglomeration occur by neck formation between two neighboring particles. The splitting of γ′ particles was identified as one of the main dissolution mechanisms. Based on the obtained results, a dissolution kinetics model is proposed to quantify the volume fraction of dissolved γ′ particles and estimate the activation energy of this process for AD730 TM . A coarsening model based on the time-temperature dependence of the γ′ coarsening rate coefficient is also proposed taking the concentration of elements, γ′ volume fraction and the temperature into consideration. Based on this model, a method is developed to predict γ′ size evolution during aging heat treatment process and an optimum heat treatment to reach the desired γ′ distribution is proposed.The validity and accuracy of the proposed models were verified by carrying out different heat treatment experiments.

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“…• C was selected to achieve a homogeneous and MATEC Web of Conferences coarse grain size [3]. A poor and insufficient ductility was expected with a coarse grain microstructure obtained with a high cooling rate from 1120…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…AD730 TM produced by the conventional C&W processes has an attractive combination of manufacturing costs and mechanical properties at higher temperatures [1][2][3]. For future applications in gas turbines, improved cyclic, creep and oxidation properties will certainly be needed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and development of supersolvus heat treated new nickel base superalloy AD730^TM

Devaux¹,

Berglin

Thébaud³

et al. 2014

MATEC Web of Conferences

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Abstract. The enhancement of efficiency in power generation gas turbine requires the development of new superalloys capable of withstanding higher temperatures. The development of AD730 TM superalloy was achieved to provide to this new cast & wrought (C&W) superalloy a higher combination between mechanical properties, microstructural stability and cost than that of other C&W superalloys with a temperature capability up to 750• C. Supersolvus heat-treatment of AD730 TM was studied to improve the creep properties of fine grain AD730 TM superalloy which were not high enough to reach the foreseen conditions of future power generation gas turbine disks. Firstly, the grain growth was studied to select the supersolvus temperature 1120• C and to obtain a homogeneous coarse grain microstructure. Then, various supersolvus heat-treatments with different cycles were tested and applied on a forged pancake with a section representative of power generation gas turbine disk. The average grain size was evaluated to be close to 200 µm for all heat-treatments. Tensile, creep, fatigue and fatigue crack growth tests were performed to compare the various heat-treatments. FEG-SEM examinations were also realized to discuss the relationships between heat-treatment, intragranular gamma prime precipitation and mechanical properties. Finally, a comparison made with other supersolvus heat treated C&W superalloys shows that AD730 TM properties obtained with coarse grain microstructure are at the expected level and enable applications for power generation gas turbine discs.

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AD730 ^™ ‐ A New Nickel‐Based Superalloy for High Temperature Engine Rotative Parts

Cited by 47 publications

References 15 publications

Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

Coarsening and dissolution of γ′ precipitates during solution treatment of AD730™ Ni-based superalloy: Mechanisms and kinetics models

Mechanical properties and development of supersolvus heat treated new nickel base superalloy AD730^TM

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AD730 ™ ‐ A New Nickel‐Based Superalloy for High Temperature Engine Rotative Parts

Cited by 47 publications

References 15 publications

Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

Coarsening and dissolution of γ′ precipitates during solution treatment of AD730™ Ni-based superalloy: Mechanisms and kinetics models

Mechanical properties and development of supersolvus heat treated new nickel base superalloy AD730TM

Contact Info

Product

Resources

About

AD730 ^™ ‐ A New Nickel‐Based Superalloy for High Temperature Engine Rotative Parts

Mechanical properties and development of supersolvus heat treated new nickel base superalloy AD730^TM