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Abstract <p>A tri-layered TWIP/IF/TWIP composite steel fabricated via thermomechanical processing (hot-rolling) demonstrates exceptional room-temperature tensile ductility, with systematic investigation of its TWIP/IF interfacial evolution through multiscale characterization combining transmission electron microscopy, electron-probe microanalysis, and nano-indentation. The as-processed interface exhibits dual transition zones: a lath martensite-dominated region (TWIP side) with Vickers hardness exceeding 4 GPa, and a ferritic zone (IF side) containing dense dislocation substructures. This interfacial hardening stems from Mn, C interdiffusion during processing, generating a chemically graded interface with asymmetric carbon distribution. Post-deformation analysis reveals pronounced strain-induced microstructural evolution: parallel deformation bands and metastable <i>ω</i>-cementite showing as nanoscale “ridges” embedded in martensite matrix in TWIP-adjacent regions, contrasting with refined dislocation cell and shear band structures in IF-proximal zones. Remarkably, interfacial martensite sustains plastic deformation up to 54 pct uniform elongation without cracking, developing ductile-type microstructures featuring tangled dislocations and deformation bands.</p> Graphical Abstract <p></p>

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Martensite-Embedded Heterostructured Interface with Extraordinary Synergistic Strain Accommodation in a TWIP/IF/TWIP Multilayered Steel Composite

  • 期刊论文

  • 发表日期：

    2026年1月25日

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  • Chi Xu,
  • Weitao Yang,
  • Yixing Ma,
  • Qi Yang,
  • Kuaishe Wang

摘要

Abstract

A tri-layered TWIP/IF/TWIP composite steel fabricated via thermomechanical processing (hot-rolling) demonstrates exceptional room-temperature tensile ductility, with systematic investigation of its TWIP/IF interfacial evolution through multiscale characterization combining transmission electron microscopy, electron-probe microanalysis, and nano-indentation. The as-processed interface exhibits dual transition zones: a lath martensite-dominated region (TWIP side) with Vickers hardness exceeding 4 GPa, and a ferritic zone (IF side) containing dense dislocation substructures. This interfacial hardening stems from Mn, C interdiffusion during processing, generating a chemically graded interface with asymmetric carbon distribution. Post-deformation analysis reveals pronounced strain-induced microstructural evolution: parallel deformation bands and metastable ω-cementite showing as nanoscale “ridges” embedded in martensite matrix in TWIP-adjacent regions, contrasting with refined dislocation cell and shear band structures in IF-proximal zones. Remarkably, interfacial martensite sustains plastic deformation up to 54 pct uniform elongation without cracking, developing ductile-type microstructures featuring tangled dislocations and deformation bands.

Graphical Abstract