Influence of Withdrawing Rates on Elements Segregation and Creep Properties of A Single Crystal Nickel-Based Superalloy

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Abstract: The single crystal nickel-based superalloys with different dendrite spacings were prepared by using various withdrawing rates, and the influence of withdrawing rates on elements segregation and creep properties of them is investigated through creep property measurements and microstructure observation. Results show that relatively bigger withdrawing rate leads to the smaller dendrite spacing and lower segregation extent of elements between the dendrite/interdendrite regions, which further causes the better creep resistance of the alloy. Dislocations climbing over the rafted γ′ phase is deemed as the deformation mechanism of the superalloys during steady state creep. In the later stage of creep, significant amount of dislocations shear into the rafted γ′ phase, which may promote the alternative slipping of dislocations to twist the rafted γ′ phase. At the further latter stage of creep, the initiation and propagation of the cracks occuring up to creep fracture is the fracture mechanism of the superalloy.

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Influence of Withdrawing Rates on Elements Segregation and Creep Properties of A Single Crystal Nickel-Based Superalloy ; volume:31 ; number:2 ; year:2012 ; pages:125-131
High temperature materials and processes ; 31, Heft 2 (2012), 125-131

Urheber
Tian, Sugui
Zhang, Chao
Yu, Xingfu
Zeng, Zheng
Su, Yong

DOI
10.1515/htmp-2011-0149
URN
urn:nbn:de:101:1-2501270417432.366047187339
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:27 MESZ

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Beteiligte

  • Tian, Sugui
  • Zhang, Chao
  • Yu, Xingfu
  • Zeng, Zheng
  • Su, Yong

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