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Ashby-Weertman Deformation-Mechanism maps 9Cr1Mo steel and 316 Stainless steels

Future nuclear reactors will have a design life of at least 60 years. Moreover they will operate under high temperatures (450 - 600 C), irradiation damage will be significanlty higher and they have different coolants (super-critical water, sodium. lead, helium) that interact with the materials. Components need to be designed against creep rupture and creep-fatigue. Creep data will be based on accelerated tests where the stresses or temperature are higher. A very fundamental issue is then how to extrapolate the accelerated test data to the operational conditions. There are various methods for this such as Larson-Miller plots, Monkman-Grand, but extrapolation becomes very tricky if the deformation mechanism changes (e.g. in the accelerated test we have power-law dislocation creep whereas in the operational conditions the creep would be Cobble diffusion creep). Ashby-Weertman deformation-mechanism maps are a very useful tool to guide extrapolation. I am therefore looking for such maps for some materials. I am now in particular looking at austenitic steels (type 316L) and ferritic-martensitic steels with 9-12%Cr (e.g P91).

For austenitic steels I have found deformation-mechanism maps (for instance in Frost and Ashby's book ) but I would be interested in more recent ones and for different microstrures and variants of the steel.

For the ferritic-martensitic steel I haven't found anything. Is anyone aware of deformation-mechanism maps for these materials?

I would also be generally interested in methods and experience for accelerated tests and extrapolation to operational conditions.

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