The dislocation pipe diffusion of Mn during annealing of 5Mn steel was experimentally investigated using transmission electron microscopy (TEM).Many dislocations existed inside the ferrite and terminated at theα/γin-terface of the sample after intercritical annealing at 650 ℃ for 1 min.Line scans of Mn distribution demonstrated a high Mn concentration in austenite and Mn enrichment at dislocations,indicating that the dislocation pipe diffusion of Mn during intercritical annealing occurred in addition to theγ/αinterface diffusion.In-situ TEM observations at 500 ℃ re-vealed that due to Ostwald ripening,large cementite precipitates grew while small cementite precipitates dissolved via Mn diffusion along the dislocations between them.
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