Е-Публикации
Технически университет - София

Abstract: Licensee IJOMAM, Romania.This study investigates the effects of recrystallization annealing on the mechanical properties and microstructure of cold-drawn AISI 1566 steel wire. Cold drawing is a highly precise metalworking process that enhances material properties such as mechanical strength, dimensional accuracy, and surface quality. The process induces significant dislocation accumulation, which, in combination with deformation mechanisms such as slip and formation of crystallographic twins at the nanoscale, optimizes material performance. The paper examines the temperature-dependent changes in hardness and microstructure, alongside the impact of recrystallization annealing on ultimate tensile strength (Rm) and relative elongation (δ). The results indicate that recrystallization annealing at temperatures ranging from 350°C to 730°C facilitates the formation of new, defect-free grains, thereby reducing internal stresses and improving plasticity. However, higher temperatures and extended holding times promote grain growth, leading to a reduction in mechanical strength while enhancing ductility. The study further explores the interplay between annealing temperature, holding time, and mechanical properties, emphasizing the importance of precise control over these parameters to achieve an optimal balance between strength and plasticity.

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