Effect of a large population of seeded alumina inclusions on crack initiation and small crack fatigue crack growth in Udimet 720 nickel-base disk superalloy

Telesman, Jack; Gabb, Timothy P.; Kantzos, Pete; Bonacuse, Peter J.; Barrie, Robert L.; Kantzos, Christopher

doi:10.1016/j.ijfatigue.2020.105953

Cited by 14 publications

(5 citation statements)

References 14 publications

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“…Inclusions are typically introduced during the melting process and can be difficult to remove in later processes, such as hot isostatic pressing. These inclusions can significantly reduce the tensile strength and fatigue properties of the superalloy components [4]. Therefore, addressing the formation mechanisms of inclusions is important in the development of superalloys.…”

Section: Introductionmentioning

confidence: 99%

Investigation of oxide inclusion films in cast superalloy impeller

Zhang,

Chen,

Xing

et al. 2024

J. Phys.: Conf. Ser.

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Oxide inclusions are commonly found in casting alloys. During vacuum investment casting of polycrystalline nickel-based superalloy, various forms of oxide inclusions can be observed, including membrane-like inclusions. These oxide inclusion films can significantly reduce the mechanical properties of nickel-based superalloys. A cast superalloy impeller that fractured due to internal oxide inclusion films was analyzed in this article. The objective of this article is to analyze the morphology and composition of oxide inclusion films and investigate their formation mechanisms. This article uses a scanning electron microscope and transmission electron microscope to characterize oxide inclusion film samples. The results show that the oxide inclusions are composed of film-like alumina, magnesium-aluminium spinel, and magnesia particles encapsulated by magnesium-aluminium spinel films. The oxide inclusion films are formed through a reaction between the liquid metal melt and the magnesia crucible. These oxide films are then floating into the nickel matrix through the scouring of the liquid metal melt and become internal inclusions.

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Section: Introductionmentioning

confidence: 99%

Investigation of oxide inclusion films in cast superalloy impeller

Zhang,

Chen,

Xing

et al. 2024

J. Phys.: Conf. Ser.

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“…[6][7][8][9][10] Fatigue crack initiation process usually takes up most of the turbine disk life. [11][12][13] Non-metallic inclusions in PM superalloys are the preferential sites for crack initiation under fatigue load, 6,7,[14][15][16][17] giving rise to decreased and dispersed LCF life. 1,6,17 Inclusion-induced LCF crack initiation mainly includes inclusion/matrix interface cracking, inclusion cracking, and slip band or grain boundary cracking in the matrix surrounding the inclusion.…”

Section: Introductionmentioning

confidence: 99%

“…1,6,17 Inclusion-induced LCF crack initiation mainly includes inclusion/matrix interface cracking, inclusion cracking, and slip band or grain boundary cracking in the matrix surrounding the inclusion. [6][7][8]10,[14][15][16][18][19][20] The crack initiation sites can be divided into surface, subsurface, and interior of the specimen. 6,21,22 The specific type and location of LCF crack initiation depend on inclusion size, morphology, and distribution, 14,21,[23][24][25] material surface stress and strain state, 5,22 as well as loading conditions and temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Non‐metallic inclusions in PM superalloys are the preferential sites for crack initiation under fatigue load, 6,7,14–17 giving rise to decreased and dispersed LCF life 1,6,17 . Inclusion‐induced LCF crack initiation mainly includes inclusion/matrix interface cracking, inclusion cracking, and slip band or grain boundary cracking in the matrix surrounding the inclusion 6–8,10,14–16,18–20 . The crack initiation sites can be divided into surface, subsurface, and interior of the specimen 6,21,22 .…”

Section: Introductionmentioning

confidence: 99%

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Low‐cycle fatigue life prediction of powder metallurgy superalloy considering characteristic parameters of inclusions

Feng,

Zhang,

Wang

et al. 2023

Fatigue Fract Eng Mat Struct

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Foreign non‐metallic inclusions can significantly reduce the low‐cycle fatigue (LCF) life of powder metallurgy (PM) superalloy and greatly affect the safety and reliability of aeroengines. In this paper, LCF experiments on PM FGH96 superalloy with and without inclusions were conducted. Effects of inclusions on the fatigue life and damage mechanism of FGH96 alloy are discussed by fractography analysis. Parameters related to inclusion characteristics such as strength–inclusion coefficient are proposed. By introducing characteristic parameters of inclusions, the LCF life prediction models are established based on the Manson–Coffin relationship, which significantly improved the prediction accuracy and reduced the scattering band by a factor of 2.

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“…As can be seen from Fig. 1 , the main body of the turbine disk is connected with the blade ring by the diffusion bonding 1 – 3 . Due to the factors such as surface roughness and impurities during the welding process, diffusion defects are easy to occur on the welding interface, risking the robustness of the aero-engine.…”

Section: Introductionmentioning

confidence: 99%

A novel non-destructive testing method for turbine disks using dual array ultrasonic transducer

Teng

Zhou

2022

Sci Rep

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A novel dual array inspection method for detecting the diffusion bonding defects of superalloy turbine disk has been proposed in this study. The influence of relative position between the planar defect and acoustic source has been analysed, and based on which, the transmission and reception algorithm for the dual array method has been proposed. The time delay law of the dual array transducer for the complex turbine disk structure has been investigated. Finite-difference time-domain theory has been used to establish the numerical model of the dual array method. In the numerical simulations, the novel method has been applied for the superalloy turbine disk specimen with prefabricated defects at the depth of 18.3 m and 28.3 mm. Furthermore, the corresponding experiment has been conducted and verifies the reliability of the simulation. The novel method shows advantages in detecting small diffusion bonding defects in complex structure, assisting the manufacture of superalloy turbine disks, and ensuring the safety of aircrafts.

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Effect of a large population of seeded alumina inclusions on crack initiation and small crack fatigue crack growth in Udimet 720 nickel-base disk superalloy

Cited by 14 publications

References 14 publications

Investigation of oxide inclusion films in cast superalloy impeller

Investigation of oxide inclusion films in cast superalloy impeller

Low‐cycle fatigue life prediction of powder metallurgy superalloy considering characteristic parameters of inclusions

A novel non-destructive testing method for turbine disks using dual array ultrasonic transducer

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