THICKNESS EFFECTS OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOYS

Acta Metall Sin

1997, Vol. 33

Issue (3): 265-270 DOI:

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THICKNESS EFFECTS OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOYS

YUE Zhufeng; LU Zhenzhou; ZHOU Li; ZHENG Changqing (Northwestern Polytechnical University; Xi'an 710072)

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YUE Zhufeng; LU Zhenzhou; ZHOU Li; ZHENG Changqing (Northwestern Polytechnical University; Xi'an 710072). THICKNESS EFFECTS OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOYS. Acta Metall Sin, 1997, 33(3): 265-270.

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Abstract The deformation and fracture characteristics of nickel-base single crystal superalloys at high temperatures, which are in plates with different thickness and in different crystallographic orientations, have been studied. The macro-results show that the thickness effects are dependent on the test temperature. The strength increases with decreasing thickness at 1000℃, while the strength increases with increasing thickness below 950℃. At 1000℃, the dependence of strength on crystallographic orientation is not distinct. The micro-results show that [001] plate specimens at 1000℃ are in void-related ductile fracture model, and the rest specimens are in micro-face fracture model. And it is confirmed that the microface are crystallographic slip plane, and voids on the faces have important effects on the fracture.

Key words: nickel-base single crystal superalloy thickness effect mechanical property

Received: 18 March 1997

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