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PHASE MORPHOLOGY EVOLUTION AND ANISOTROPIC CREEP BEHAVIOUR OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOY CMSX-4 |
PENG Zhifang;YAN Yanhui(Wuhan University of Hydraulic and Electric Engineering; Wuhan 430072) |
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Cite this article:
PENG Zhifang;YAN Yanhui(Wuhan University of Hydraulic and Electric Engineering; Wuhan 430072). PHASE MORPHOLOGY EVOLUTION AND ANISOTROPIC CREEP BEHAVIOUR OF NICKEL-BASE SINGLE CRYSTAL SUPERALLOY CMSX-4. Acta Metall Sin, 1997, 33(11): 1147-1154.
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Abstract The Evolutional manners and dimensional rules of γmatrix and γ'precipitates in the [001], [110] and [111] oriented specimens of nickel-base single crystal superalloy CMSX-4 during the tensile creep at 1253 K and 350 MPa were studied.The effects of the change in characteristic dimensions of γand γ' phases on the strain and strain rate were compared for the differently oriented single crystal specimens.It was found that the effect of change in mean width of γchannels along the direction of directional coarsening of γ' precipitates(the lamella spacings between adjacent rafted γ'precipitates)on the strain and strain rate is remarkable. Based on the evolutional rule of γchannels and the plastic deformation mechanisms, the anisotropic creep behaviour in the tested specimens was synthetically analyzed.
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Received: 18 November 1997
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