Structure and Property Comparison of Allvac 718Plus Alloy and Waspaloy Forgings

Dempster, Ian; Cao, Weidi; Kennedy, R. C.; Bond, Betsy J.; Aurrecoechea, José M.; Lipschutz, Mark

doi:10.7449/2005/superalloys_2005_155_164

Cited by 12 publications

(7 citation statements)

References 6 publications

(6 reference statements)

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“…Higher tensile properties at room temperature are obtained with 718Plus probably in relation with a finer grain size. These tensile properties obtained on 718Plus are in good agreement with those reported in literature after supersolvus forging and presolutioning [10].…”

Section: Mechanical Propertiessupporting

confidence: 90%

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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Section: Mechanical Propertiessupporting

confidence: 90%

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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“…Articles have reported conflicting results on the effect of these precipitates. Some found the precipitates beneficial to fatigue and creep properties [21,22] whilst others suggest that the precipitation is detrimental [23]. Such variability suggests that mechanical properties are strongly related to the volume fraction and morphology of the precipitates within the structure and hence the thermo-mechanical history [24][25][26].…”

Section: Introductionmentioning

confidence: 98%

On the precipitation of delta phase in ALLVAC^®718Plus

Messé

Barnard

Pickering

et al. 2014

Philosophical Magazine

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ALLVAC 718Plus is a new commercial superalloy derived from Inconel 718, but possessing a higher temperature capability whilst employing the same philosophy regarding the microstructure. Many articles have been published describing various heat treatments exploiting the precipitation of intermetallic phases at grain boundaries to optimize the mechanical properties over a range of testing conditions. The requirement to further improve the mechanical properties of this alloy drives our interest in the precipitation mechanism of the delta and eta phases found in this alloy. We report the presence of finely layered structures composed of two phases, delta and eta, with distinct structures and chemistries. Possible pathways to explain this precipitation in 718Plus are considered as follows: (i) the sequential formation of the delta from eta phase and (ii) the simultaneous precipitation of both eta and delta facilitated via solute rejection. Both can result in the formation of those small delta layers observed in HRSTEM. We discuss which is most likely by comparing the relative alignment of the phases by image processing and the analysis of the HRSTEM images, and propose formation mechanisms consistent with the distinctive dislocation structures observed at the interface.

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“…Table 2 is the component elements of Waspaloy, the standard nickel base material. Therefore, they have hardening precipitation, high affinity and low coefficient of heat conduction phenomenon [2, 13, 17]. How machinability a metal is depends on the physical properties as well as the cutting conditions.…”

Section: Methodsmentioning

confidence: 99%

Lifespan of super-alloy Waspaloy cutting tools

Chen

2019

Heliyon

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An airplane has about 6-million components and parts, mainly the engine, undercarriage, constructions and so on. Among them, nickel base materials are widely used, including engine, cartridge receiver, compressor drum and other industries application, such as energy, petrochemical industry, mould, etc. Nickel base alloy, with anti-corrosion and thermo stability, has good mechanical properties under high temperature. Since 1950s, due to the development of precision casting technology, a series of cast nickel base super-alloy with high strength has been developed, namely the super-alloy complying with the above conditions. In recent years, with the changing of military and civil aerospace, the usage amount of nickel base super-alloy also increases along with the date. This research mainly used Waspaloy of nickel base material to do cutting research and uses regression analysis to find significant factor of cutting tool's life, and performs the optimization experiment. The cutting research mainly uses TiAlN to coat cutting tools. In the conclusion, it discusses main factors that influence the tool life, such as the cutting speed, depth, feed rate and so on. Finally it establishes tool life formula with regression analysis method, in this case when cutting speed V = 30.77 m/min and cutting depth dp = 0.0367mm, the minimum wear prediction can be obtained.

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Structure and Property Comparison of Allvac 718Plus Alloy and Waspaloy Forgings

Cited by 12 publications

References 6 publications

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

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

On the precipitation of delta phase in ALLVAC^®718Plus

Lifespan of super-alloy Waspaloy cutting tools

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Structure and Property Comparison of Allvac 718Plus Alloy and Waspaloy Forgings

Cited by 12 publications

References 6 publications

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

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

On the precipitation of delta phase in ALLVAC®718Plus

Lifespan of super-alloy Waspaloy cutting tools

Contact Info

Product

Resources

About

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

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

On the precipitation of delta phase in ALLVAC^®718Plus