Abstract
AISI 321 steels used as heat exchange tube are generally subjected to creep-fatigue exposure during service. Assessing their remnant properties is therefore required to ensure components safety. In this work, cyclic responses during different prior creep-fatigue exposure, and remnant tensile and creep behaviors of AISI 321 were studied. Results revealed cyclic responses showed initial hardening and subsequent softening. Due to pinning effects of M23C6 and increased twining boundary fractions, remnant properties were improved when prior creep-fatigue lifetime fraction is below 50%. However, degraded remnant properties with lifetime fraction further increasing to 80% were found, resulted from de-twinning and carbide coarsening.
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