Superalloy Powder Processing, Properties, and Turbine Disk Applications

Chang, Daofang; Krueger, D. D.; Sprague, Robert A.

doi:10.7449/1984/superalloys_1984_245_273

Cited by 57 publications

(36 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

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)

View full text Add to dashboard Cite

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

Section: Low Cycle Fatigue Responsementioning

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)

View full text Add to dashboard Cite

show abstract

“…The benefits of an extruded P/M billet are well documented with respect to minimizing the effects of nonmetallic inclusions and other defects (Ref. 4). The combination of HIP and extrude enhances microstructural uniformity and forgeability in a very cost-effective manner.…”

Section: P/m Billet Processingmentioning

confidence: 99%

Development of Isothermally Forged P/M Udimet 720 for Turbine Disk Applications

Green¹,

Lemsky²,

Gasior³

1996

Superalloys 1996 (Eighth International Symposium)

View full text Add to dashboard Cite

Udimet 720@ nickel-base superalloy is in current use as the material for the stage-two power turbine disk for the T800 engine. This alloy was selected because of its attractive level of tensile strength and resistance to low cycle fatigue (LCF). Advancements in novel isothermal forging technology have enabled the production of complex disk forgings called cluster forgings.A single cluster forging produces seven PT2 disks in a single forging operation. Coupled with recent advances in powder metallurgy (P/M) billet production featuring consolidation by HIP followed by extrusion, turbine disk forgings can be produced at a significant cost reduction as compared to single-piece hot die forged disks made from conventional cast/wrought billet. P/M Udimet 720 material displays excellent mechanical properties, competitive with other high strength disk alloys.Turbine disks produced from isothermally forged P/M Udimet 720 passed component test requirements established for the T800 engine. A significant cost reduction resulted from the use of this process.

show abstract

“…at a strain rate of approximately 1.0 set-l. For this work, the data for Rene 95 is used (11,12 These two mechanisms are considered to act exclusively of one another. The creep behavior of RenC 95 is used to determine at which stresses each mechanism operates, see Figure 4.…”

Section: Yieldingmentioning

confidence: 99%