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Partitioning at phase boundaries of complex steels is important for theirproperties. We present atom probe tomography results across martensite /austenite interfaces in a precipitation-hardened maraging TRIP steel (12.2 Mn,1.9 Ni, 0.6 Mo, 1.2 Ti, 0.3 Al; at.%). The system reveals compositional changesat the phase boundaries: Mn and Ni are enriched while Ti, Al, Mo, and Fe aredepleted. More specific, we observe up to 27 at.% Mn in a 20 nm layer at thephase boundary. This is explained by the large difference in diffusivitybetween martensite and austenite. The high diffusivity in martensite leads to aMn-flux towards the retained austenite. The low diffusivity in the austenitedoes not allow accommodation of this flux. Consequently, the austenite growswith a Mn-composition given by local equilibrium. The interpretation is basedon DICTRA and mixed-mode diffusion calculations (using a finite interfacemobility).

Chemical gradients across phase boundaries between martensite and austenite in steel studied by atom probe tomography and simulation