Abstract
High‐N Mn18Cr18 alloy is mainly used as drill collar (DC) and retaining rings due to its non‐magnetism and outstanding corrosion resistance. This work focuses on studying the dynamic recrystallization (DRX) behavior and thermal mechanical properties of high‐N Mn18Cr18 alloy through isothermal single‐pass compression tests on Gleeble‐3500 simulator at the temperatures from 900–1200 °C and strain rates from 0.001–1 s−1. Flow stress curves combined with metallographic analysis indicate that DRX tends to occur at high deformation temperatures and low strain rates. The deformation activation energy of high‐N Mn18Cr18 alloy is 331.775 kJ mol−1. Besides, fifth order polynomial fitting for determining critical strain and nonlinear curve fitting for extrapolating work hardening stress are presented. Based on kinetics equations of DRX and the dislocation density model, constitutive model is been set up to predict the flow stress behavior. Comparisons between the experimental and the predicted flow stress values indicate good forecast precision of the established model.
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