The creep behaviour of an industrial cast Cr-Mo-V steel can be described in terms of the following constitutive equation: εs = K·Dl(σ/E)n. The stress exponent n depends strongly on the initial structure and no direct relationship exists between its value and the creep rate-controlling mechanism. For all applied stresses, subgrains and carbide precipitates are the predominant substructural feature. Power-law creep is controlled by the thermally activated motion of dislocations. The same mechanism applies for creep under cycling temperature conditions, and the stress/strain-rate behaviour can be predicted by calculating an effective mean temperature by means of the Dorn parameter (θ parameter).
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