<p>This study utilizes rapid heating to systematically examine the influence of initial microstructures and soaking periods on the final quenched microstructure and hardness. Results demonstrate that rapid heating followed by short soaking periods produces a refinement of martensite lath structure and delays martensite formation in initial martensite microstructures. The chemical heterogeneity inherited from pearlitic and cold-rolled pearlitic microstructures can be preserved during subsequent cooling after rapid heating. This preservation results in an elevated martensite start temperature, an increased retained austenite content and a reduction in hardness. Concurrently, extended soaking and pre-cold rolling act in concert to homogenize Mn and Cr, the former by providing increased diffusion distances and the latter by accelerating pipe diffusion through defect substructures, thereby progressively reducing compositional heterogeneity. This also reduces the retained austenite and ghost pearlite fractions.</p>