Modelling of delta ferrite to austenite phase transformation kinetics in martensitic steels: application to rapid cooling in additive manufacturing

In this paper, the high temperature transformation kinetics of delta ferrite to austenite (δ → γ) phase transformation is modeled by thermodynamic and diffusion calculations. It appears that, in martensitic steels, the rapid cooling conditions encountered in additive manufacturing processes significantly influence the kinetics of this transformation. By employing a combination of thermodynamic models and diffusion theories, the study reveals the intricate interplay between cooling rates and phase stability, providing insights essential for improving the mechanical properties of martensitic steels. The findings suggest that optimizing cooling parameters can effectively control the phase distribution during solidification, ultimately enhancing the performance of materials utilized in advanced manufacturing applications. This work not only contributes to the understanding of phase transformations in high-temperature contexts but also serves as a valuable reference for future research and practical implementations in the field of additive manufacturing.