The service life of FB2 steel, a boron-modified 9 % Cr martensitic stainless steel for high-temperature applications, is predominantly governed by its creep-fatigue resistance. Therefore, the stress-controlled cycling loading tests with different dwell time (5, 15, 30 s) at 620 ℃ were employed to study the creep-fatigue behavior of FB2 steel. Meanwhile, two martensitic lath widths of 286 nm (H-FB2 steel) and 568 nm (L-FB2 steel) were tailored for FB2 steel by different heat treatment. Both FB2 variants exhibited pronounced cyclic softening beh...
