A modified pearlite microstructure to overcome the strength-plasticity trade-off of heavily drawn pearlitic wire

Lichu Zhou, Feng Fang*, Masayoshi Kumagai, Ed Pickering, Xiaodan Zhang

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    It has long been established that drawn pearlitic steel wires can achieve ultra-high strengths; however, this is usually achieved to the detriment of tensile and torsional ductility. Here, we employed a mod- ified microstructure to overcome these trade-offs through a process involving simple multiple drawing and annealing steps. In this microstructure, the conventional pearlitic cementite plates are replaced by cementite nano-particles bridged by grain boundaries enriched with substitutional elements. After being subject to this modified processing route, 0.92%C steel wires were found to exhibit 2300 MPa tensile strength, 6.4% uniform elongation and 0.73 uniform torsion strain. The wires processed by the new route had higher ultimate strength than wires prepared by the traditional process to the same strain, but with much superior tensile and torsional ductility –indeed they match the ductility of strain-free pearlitic steel rod.
    Original languageEnglish
    Article number114236
    JournalScripta Materialia
    Volume206
    Number of pages7
    ISSN1359-6462
    DOIs
    Publication statusPublished - 2021

    Keywords

    • Pearlitic steels
    • Microstructural design
    • Lamellar structure
    • Cold drawing

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