Microstructure and Creep Behavior of a Single Crystal Nickel-Base Superalloy with [011] Orientation

Abstract:

An investigation has been made into the microstructure and creep behaviors of [110] oriented single crystal nickel-base superalloy. Results show that, after a full heat treated, the cubic  phase is coherently embedded in the matrix and regularly arranged along the <100> orientation. During creep, the cubic phase in the alloy is transformed into the rafted structure lying 45 relative to the direction of the applied stress. Under the condition of the applied stress of 137 MPa at 1040°C, the alloy displays a higher strain rate and shorter creep lifetime. The deformation mode of the alloy during creep is dislocations activated within the matrix channels and the rafted phase. Dislocation slip activated easily on the Roof-type channel is thought to be the main reason of the alloy having higher strain rate and shorter creep lifetime.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 512-515
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.512
• Online since: June 2010
• Authors: Su Gui Tian, Shu Zhang, Li Li Yu, Hui Chen Yu, Ben Jiang Qian
• Keywords: [110] Orientation, Creep Behaviour, Deformation Feature, Micro-Structure Evolution, Single Crystal Nickel-Base Superalloy

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