A study of the strain path dependency of non-heat treatment Fe-Cr-Mn steel for cold heading quality wire rod

초록

This study focuses on the development of non-heat treatment wire rods for cold forging by eliminating conventional spheroidizing and quenching-tempering processes. Since the material undergoes a plastic deformation sequence of drawing followed by forging, securing cold forgeability is essential. To this end, the work hardening effects according to cross-sectional reduction during drawing were analyzed through optical microscopy observations and Vickers hardness measurements, and the strain path dependency was evaluated by performing tensile and compressive tests on each drawn steel. It was found that during deformation in the opposite direction to the drawing process, such as drawing followed by compression, mobile and reversible dislocations meet dislocations of opposite sign and annihilate, thereby facilitating plastic deformation. This dislocation annihilation predominantly occurs within ferrite grains, where obstacles to dislocation motion such as cementite, low-angle grain boundaries and high-angle grain boundaries are relatively limited. © 2026 Elsevier B.V.

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