Effectiveness of shot peening in suppressing fatigue cracking at non-metallic inclusions in Udimet® 720

Barrie, Robert L.; Gabb, Timothy P.; Telesman, Jack; Kantzos, Pete; Prescenzi, A.; Biles, Tiffany; Bonacuse, Peter J.

doi:10.1016/j.msea.2007.03.100

Cited by 28 publications

(15 citation statements)

References 2 publications

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“…They also found that a short time heat treatment on the machined alloy resulted in an even better fatigue resistance, but a prolonged heat treatment either led to no improvement or a decrease of the fatigue life. The beneficial effect of compressive residual stresses have also been reported in other nickel-based superalloys [17][18][19].…”

Section: Introductionmentioning

confidence: 63%

On the conjoint influence of broaching and heat treatment on bending fatigue behavior of Inconel 718

Chen

Peng

Johansson

et al. 2016

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 63%

On the conjoint influence of broaching and heat treatment on bending fatigue behavior of Inconel 718

Chen

Peng

Johansson

et al. 2016

Materials Science and Engineering: A

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“…However, an inner specimen having nearly 10 x lower life than all others failed from an internal Type 2 inclusion 12 m in diameter, at a minimum depth of 29 m. This curious response could be related to complex interactions between the concentration of stress near the surface of the notch, surface compressive residual stresses from notch machining process [14], and the tendencies for initiation of cracks at such small defects. Certainly, it helped illustrate that while such fine grain microstructures of inner specimens can give longer mean fatigue lives than for coarse grains, they can be more sensitive to such small defects, to give more scatter in life at highly stressed surfaces [13,14].…”

Section: Notch Failure Modesmentioning

confidence: 99%

Fatigue Failure Modes of the Grain Size Transition Zone in a Dual Microstructure Disk

et al. 2012

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Mechanical property requirements vary with location in nickelbased superalloy disks. In order to maximize the associated mechanical properties, heat treatment methods have been developed for producing tailored grain microstructures. In this study, fatigue failure modes of a grain size transition zone in a dual microstructure disk were evaluated. A specialized heat treatment method was applied to produce varying grain microstructure in the bore to rim portions of a powder metallurgy processed nickel-based superalloy disk. The transition in grain size was concentrated in a zone of the disk web, between the bore and rim. Specimens were extracted parallel and transversely across this transition zone, and multiple fatigue tests were performed at 427 C and 704 C. Grain size distributions were characterized in the specimens, and related to operative failure initiation modes. Mean fatigue life decreased with increasing maximum grain size, going out through the transition zone. The scatter in limited tests of replicates was comparable for failures of uniform gage specimens in all transition zone locations examined.

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“…The inclusions initiating failures were usually granulated, aluminum-rich oxide Type 2 (T2) inclusions [13,14]. These failures initiated internally, and this difference in failure mode and location helped explain the longer lives of inner specimens compared to mid, outer, and radial locations.…”

Section: Low Cycle Fatigue Responsementioning

confidence: 99%

“…However, an inner specimen having nearly 10 x lower life than all others failed from an internal Type 2 inclusion 12 µm in diameter, at a minimum depth of 29 µm. This curious response could be related to complex interactions between the concentration of stress near the surface of the notch, surface compressive residual stresses from notch machining process [14], and the tendencies for initiation of cracks at such small defects. Certainly, it helped illustrate that while such fine grain microstructures of inner specimens can give longer mean fatigue lives than for coarse grains, they can be more sensitive to such small defects, to give more scatter in life at highly stressed surfaces [13,14].…”

Section: Notch Failure Modesmentioning

confidence: 99%

Fatigue Failure Modes of the Grain Size Transition Zone in a Dual Microstructure Disk

Gabb¹,

Kantzos²,

Palsa³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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Mechanical property requirements vary with location in nickelbased superalloy disks. In order to maximize the associated mechanical properties, heat treatment methods have been developed for producing tailored grain microstructures. In this study, fatigue failure modes of a grain size transition zone in a dual microstructure disk were evaluated. A specialized heat treatment method was applied to produce varying grain microstructure in the bore to rim portions of a powder metallurgy processed nickel-based superalloy disk. The transition in grain size was concentrated in a zone of the disk web, between the bore and rim. Specimens were extracted parallel and transversely across this transition zone, and multiple fatigue tests were performed at 427 °C and 704 °C. Grain size distributions were characterized in the specimens, and related to operative failure initiation modes. Mean fatigue life decreased with increasing maximum grain size, going out through the transition zone. The scatter in limited tests of replicates was comparable for failures of uniform gage specimens in all transition zone locations examined.

show abstract

Effectiveness of shot peening in suppressing fatigue cracking at non-metallic inclusions in Udimet® 720

Cited by 28 publications

References 2 publications

On the conjoint influence of broaching and heat treatment on bending fatigue behavior of Inconel 718

On the conjoint influence of broaching and heat treatment on bending fatigue behavior of Inconel 718

Fatigue Failure Modes of the Grain Size Transition Zone in a Dual Microstructure Disk

Fatigue Failure Modes of the Grain Size Transition Zone in a Dual Microstructure Disk

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