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The evolution of the dislocation substructure during the accelerating creep stage in the single crystal nickel-based superalloy, CMSX-4, was investigated through the microstructural observation of interrupted creep specimens at 1273K-160MPa. The dislocation substructure evolved, not within v, but at the y/y’ interface and in the y channel. The dislocation density at the y/f interface increased with increasing creep deformation. The correlation between the dislocation density and the creep rate during the accelerating creep stage led to an equation relating the creep rate to the fifth power of the dislocation density. This result was quite different from the supposition proposed by Dyson et al. that the creep rate during the accelerating creep stage would be directly proportional to the dislocation density. They supposed that the dislocations at the y/f interface acted as mobile ones. The thickness of the y channel increased with creep, and the creep rate during the accelerating creep stage was proportional to the fifth power of the thickness of the y channel. The increase in the thickness of the y channel meant the increase in the radius of dislocation curvature in the y channel, then the loss of creep resistance during the accelerating creep stage would be interpreted by an increase in the radius of dislocation curvature. This same correlation between the creep rate during the accelerating creep stage and the thickness of the y channel at 16OMPa was confirmed in the wide stress range of 100 to 400MPa. Using the creep rate-y channel thickness curves, the creep rate at the certain thickness of the y channel were estimated, and the stress-creep rate curve at the certain thickness of the y channel could be drawn. Comparing the measured stress-creep rate curve with the estimated stresscreep rate curve (at the certain thickness of the y channel), the lager creep rate was obtained at a lower stress level, and this was also interpreted by an increase in the thickness of the y channel. Consequently, the present experimental evidence, showing the effect of the thickness of the y channel on the creep rate was confirmed. Superalloys 2ooo Edited by TM. Pollock, R.D. Kissinger, R.R. Bowman, K.A. Green, M. McLean, S. Olson, and J.J. Schim TMS (The Minerals, Metals &Materials Society), 2000

The Influence of Dislocation Substructure on Creep Rate during Accelerating Creep Stage of Single Crystal Nickel-based Superalloy CMSX-4