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

SCRIPTA MATERIALIA

卷:206

Article

Zhou, Lichu^1,2  Fang, Feng¹  Kumagai, Masayoshi³  Pickering, Ed^4,5  Zhang, Xiaodan² 

[1] Southeast Univ, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Peoples R China

[2] Tech Univ Denmark, Dept Mech Engn, DK-2800 Kongens Lyngby, Denmark

[3] Tokyo City Univ, Fac Sci & Engn, Tokyo 1588557, Japan

[4] Univ Manchester, Dept Mat, Manchester M13 9PL, Lancs, England

[5] Univ Manchester, Henry Royce Inst Adv Mat, Manchester M13 9PL, Lancs, England

关键词: Pearlitic steels;    Microstructural design;    Lamellar structure;    Cold drawing;   

DOI  :  10.1016/j.scriptamat.2021.114236

来源: Elsevier

【 摘 要 】

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 modified 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. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free