High-throughput compositional mapping of phase transformation kinetics in low-alloy steel

Knowledge of phase transformation kinetics is a key point in designing steel grades, particular modern high-performance highly sought-after energy and transportation applications. The design space for these grades multi-dimensional given the numerous potential alloying elements. characterization techniques that are usually relied on to assess kinetics, such as metallography or dilatometry, time consuming, due their limitation either single composition per experiment. high-throughput approach showcased here overcomes those limitations by combining compositionally graded samples with time- space-resolved situ X-ray diffraction, yielding full kinetic records over range compositions run. Its application low-alloy required addressing specific challenges related reactivity thermodynamics material. austenite into ferrite was chosen illustrate its benefits. Using rich resulting database, mechanism examined quasi-continuously across sections space. Neither paraequilibrium, nor local equilibrium negligible partitioning model, transition from former latter applicable whole investigated conditions. Instead, observed were explained accounting solute drag exerted mobile interface. This work major contribution accelerating future involving any other which present methodology can be adapted.