Effects of Post-Drawing Surface Heat Treatments on the Strength and Torsional Ductility of High Strength Steel Wire

Abstract:

Along with high tensile strength, high carbon steel wires must possess sufficient torsional ductility is to avoid longitudinal splitting along the wire axis, known as delamination. Often, wires ductile in the bright (asdrawn) surface condition exhibit delamination failure after undergoing a post-drawing surface treatment such as hot-dip galvanizing. The objectives of this study were to examine the influence of postdrawing heat treatment time and temperature on drawn wire mechanical properties, and to identify possible treatment conditions that suppress delamination. Stelmor cooling or lead patenting prior to drawing were used to develop a pearlitic microstructure. Salt pot heat treatments simulated postdrawing heat treatments; experimental heat treatments were conducted between 325 °C and 475 °C for 20 s or at 450 °C for immersion times between 1 s and 20 s. Tension and torsion tests quantified the changes in mechanical properties due to aging. Lead patented wires experienced greater tensile strength and torsional ductility changes with aging time and temperature when compared to the Stelmor cooled wires. This increased sensitivity was attributed to greater dislocation recovery in the patented wire after drawing.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1790-1795
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1790
• Online since: December 2018
• Authors: Christina Ciganik*, John Speer, Kip O. Findley, Walther van Raemdonck
• Keywords: Delamination, High Carbon Pearlitic Steel Wire, Hot-Dip Galvanizing, Lead Patenting, Mechanical Properties, Stelmor Cooling

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