Abstract
A Cu precipitation-mediated austenitic transformation during ageing treatment of a 15–5 PH stainless steel is revealed through atom probe tomography, in situ synchrotron X-ray diffraction and computational thermodynamics and kinetics. The austenitic transformation is proposed to occur through the pathway: Cu precipitation at the martensite/retained austenite interfaces or at martensite lath boundaries → partitioning of austenite stabilizing elements towards interfaces of the Cu precipitates → reverted austenite formation.
Highlights
A Cu precipitation-mediated austenitic transformation during ageing treatment of a 15–5 PH stainless steel is revealed through atom probe tomography, in situ synchrotron X-ray diffraction and computational thermodynamics and kinetics
In the present work we target the correlation between the formation of reverted austenite, Cu precipitation and elemental partitioning that occur during the ageing treatment of a 15–5 PH steel
We propose that: firstly, Cu precipitation occurs at the tempered martensite/retained austenite interfaces or at martensite lath boundaries; secondly, Ni and Mn atoms partition towards interfaces of the Cu precipitates, where a core-shell structure is developed; thirdly, the areas enriched with austenite stabilizers (Ni and Mn) transform into reverted austenite
Summary
We propose that: firstly, Cu precipitation occurs at the tempered martensite/retained austenite interfaces or at martensite lath boundaries; secondly, Ni and Mn atoms partition towards interfaces of the Cu precipitates, where a core-shell structure is developed; thirdly, the areas enriched with austenite stabilizers (Ni and Mn) transform into reverted austenite. This microstructural transformation sequence is supported by atom probe tomography (APT) analysis, computational thermodynamics and kinetics, and in situ synchrotron X-ray diffraction (SXRD) during ageing treatment. The agreement between the thermodynamic calculations and the APT analyses for the retained austenite and the tempered martensitic matrix indi-
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