Abstract
This paper presents a dislocation-mechanics cyclic viscoplasticity model which incorporates the key physical micro-mechanisms of strengthening and softening for high temperature deformation of 9Cr steels. In particular, these include precipitate and grain boundary strengthening, low-angle boundary dislocation annihilation and martensitic lath width evolution, using dislocation density as a key variable. The new model is applied to P91 steel across a range of strain-rates and strain-ranges in the 400–600°C temperature range, for power plant header applications, to demonstrate the effect of key microstructural parameters on high temperature low cycle fatigue performance.
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