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Metals 2019, 9(3), 326; https://doi.org/10.3390/met9030326

Correlation between Microstructural Evolution and Mechanical Properties of 2000 MPa Cold-Drawn Pearlitic Steel Wires during Galvanizing Simulated Annealing

1
College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2
Wuhan Branch of Baosteel Central Research Institute, Wuhan 430080, China
*
Author to whom correspondence should be addressed.
Received: 26 January 2019 / Revised: 5 March 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Advances in Structural Steel Research)
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Abstract

In the present experiment, hot-dip galvanizing simulated annealing of 2000 MPa cold-drawn pearlitic steel wires was carried out at 450 °C. The effects of microstructural evolution on the mechanical properties of the as-prepared wires were analyzed through scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile test, torsion test, and Vickers hardness test. In addition, the relationship between torsion laps and microstructural evolution of cold-drawn pearlitic steel wires was investigated in detail. It was found that the torsional performance of the wires deteriorated after annealing at 450 °C for 2–5 min, and the corresponding microstructural evolution was accompanied by the partial degradation of lamellar pearlites due to the diffusion and dislocation pinning of dissolved carbon atoms in ferrites, and it is not feasible to achieve the matching of strength and torsion laps by prolonging the holding time. The deterioration in torsional performance can be attributed to the microstructural difference between the surface and the center of the annealed wires. When the proportion of non-lamellar structure between the surface and the center in each specimen exceeded 8%, the microhardness difference was found to be greater than 40 HV and the torsion lap was less than 3 circles. View Full-Text
Keywords: 2000 MPa; cold-drawn pearlitic steel wires; pearlite degradation; torsion laps 2000 MPa; cold-drawn pearlitic steel wires; pearlite degradation; torsion laps
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lu, X.; Liu, J.; Zhou, G.; Feng, L.; Wang, Z. Correlation between Microstructural Evolution and Mechanical Properties of 2000 MPa Cold-Drawn Pearlitic Steel Wires during Galvanizing Simulated Annealing. Metals 2019, 9, 326.

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