Microstructure and strengthening mechanisms of nanolamellar structures in ultrastrong drawn iron wires

Hanchen Feng, Linfeng Wang, Shiyun Cui, Niels Hansen, Feng Fang*, Xiaodan Zhang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ultrastrong pure iron wires have been produced with a strength of 1.8 GPa with a strain of 10.35. Based on microstructural observation and quantified structural parameters, the strengthening mechanisms and strength-structure relationship have been analyzed. It is found that the <110> fiber texture intensity, boundary spacing and boundary misorientation tend to saturation due to the boundary junction motion when the drawing strain exceeds 8.89. The dislocation density in the ferrite cells/lamellae increases to ~ 3.6 × 1015 m−2 at a drawing strain of 10.35 without saturation. Based on the systematic microstructural characterization and quantification, the d−1 or (2d)−0.5 boundary strengthening plus forest hardening are discussed.
Original languageEnglish
Article number113906
JournalScripta Materialia
Volume200
Number of pages7
ISSN1359-6462
DOIs
Publication statusPublished - 2021

Keywords

  • Cold drawing
  • Pure iron wires
  • Strength-structure relationship
  • Strengthening mechanisms

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