Effect of W and Ta on creep-fatigue interaction behavior of reduced activation ferritic-martensitic (RAFM) steels

The aim of this work is to understand the effect of varying tungsten and tantalum contents on creep-fatigue interaction (CFI) behavior of reduced activation ferritic-martensitic (RAFM) steels. Increase in W improved CFI life. Effect of changing Ta and W upon the resultant CFI life seems to be interrelated and an optimum combination of both W and Ta works out to be the best for CFI life. Stress relaxation obtained during application of hold can be a useful parameter to relate deformation and damage in the RAFM steels.