Carbide Precipitation in a Low Alloyed Steel during Aging Studied by Atom Probe Tomography and Thermodynamic Modeling

Carbide precipitation in martensitic low alloyed steels contributes to the mechanical properties through hardening. A high number density of carbides is desired maximize hardening effect, which achieved on dislocations structure. In this study, nucleation, growth, and coarsening vanadium molybdenum during aging at 600 °C for periods up four weeks were investigated. The work covers characterization with atom probe tomography, showed that nucleation V Mo rich MC/M2C takes place dislocations. growth these proceeds by diffusion elements dislocations, has been modeled using Dictra software, confirming rate reaction as well depletion carbide formers matrix. For longer times, particle will decrease particles a transition from dislocation-based separate rounded carbides.