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Synchrotron strain scanning for residual stress measurement in cold-drawn steel rods
Ruiz Hervías, Jesús; Atienza Riera, José Miguel y Elices Calafat, Manuel
Synchrotron strain scanning for residual stress measurement in cold-drawn steel rods.
"Journal of Strain Analysis For Engineering Design", v. 46
Cold-drawn steel rods and wires retain significant residual stresses as a consequence of the manufacturing process. These residual stresses are known to be detrimental for the mechanical properties of the wires and their durability in aggressive environments. Steel makers are aware of the problem and have developed post-drawing processes to try and reduce the residual stresses on the wires. The present authors have studied this problem for a number of years and have performed a detailed characterization of the residual stress state inside cold-drawn rods, including both experimental and numerical techniques. High-energy synchrotron sources have been particularly useful for this research. The results have shown how residual stresses evolve as a consequence of cold-drawing and how they change with subsequent post-drawing treatments. The authors have been able to measure for the first time a complete residual strain profile along the diameter in both phases (ferrite and cementite) of a cold-drawn steel rod.
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