Ultra-low-carbon martensitic stainless steels present significant challenges in thermomechanical processing. This study establishes a cross-scale quantitative correlation between macroscopic constitutive parameters and microstructural evolution for 00Cr13Ni5Mo steel. A strain-coupled Arrhenius constitutive model and dynamic material model processing maps were constructed over the temperature range of 950–1250°C and strain rates of 0.005–10 s -1 . The results reveal that high-temperature softening is fundamentally driven by the reduction of deformation activation energy and strain rate sensitivity, corresponding to dynamic recovery, recrystallization, and Ni 2 Cr phase dissolution. Conversely, strain hardening at high strain rates is governed by dislocation proliferation outpacing recovery, resulting in elevated hardening exponents. Based on the quantitative mapping, the optimal processing window is identified as 1100–1150°C at 0.1–1 s -1 , providing explicit engineering guidance for preventing macroscopic defects and optimizing microstructures in large-scale forgings.
Jin et al. (Sun,) studied this question.
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