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Abstract

The steady-state creep rates in the range 550–775° C and 1600–40,000 lb/in² have been determined for five niobium-stabilized austenitic steels with stacking-fault energies in the range 5–35 ergs/cm². No effect of stacking-fault energy was observed. Analyses of the stressand temperature-dependence suggest that at strain rates > ∼ 10⁻⁸/sec (stresses near or above the yield strength, ∼ 10,000 lb/in²) the creep is controlled by a cross-slip recovery process, while at lower strain rates creep is controlled by the diffusion of solute attached to dislocations. These interpretations are consistent with recovery measurements, electron metallographs, and calculations of climb rates. The consequences as regards the design of creep-resisting alloy steels are discussed.

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Creep Mechanisms in Niobium-Stabilized Austenitic Steels

Abstract

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