Probing strain rate effect on the creep–fatigue fracture mechanism of 9%Cr steel‐welded joint via nanoindentation characterization

The strain rate‐related creep–fatigue (CF) interactions on the long‐term service damage of 9%Cr steel‐welded joint were investigated at low‐strain amplitude (0.2%). Initially, the average CF life gradually increased from 1,103 to 2,185 cycles as strain rate increased from 0.0001 to 0.002 s −1 , and then it slowly decreased from 2,185 to 1,503 cycles as continuously increase the strain rate from 0.002 to 0.005 s −1 . By increasing strain rates,...