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<p>This study investigates the effect of cryorolling with 10 to 30% deformation at liquid nitrogen temperature on the microstructure and mechanical properties of ferrite–austenite dual-phase twinning-induced plasticity (TWIP) (Fe-0.06C-21Mn-3.5Al-3.10Si, wt.%) steels. The cryorolling with 30% deformation induces significant nanoscale deformation twinning (≈20&#xa0;nm) and higher statistically stored dislocation density (1.21 × 10<sup>15</sup>&#xa0;m<sup>− 2</sup> to 1.84 × 10<sup>15</sup>&#xa0;m<sup>− 2</sup>) and extrinsic stacking faults leading to a refinement of the microstructure with the higher grain aspect ratio (10:1 to 16:1) and continuous enhancement of hardness and strength properties with a concomitant decrease of ductility. The microstructural evolution and mechanical property enhancements are correlated with the mechanisms of deformation twinning, dislocation density increase, grain refinement, and suppression of dynamic recovery. For Ti-microalloyed TWIP steel, cryorolling at 30% deformation led to the maximum hardness (543&#xa0;HV), yield strength (1132&#xa0;MPa) and tensile strength (1428&#xa0;MPa), with the corresponding increments of 62%, 53%, and 50%, respectively. The fracture surfaces of 30% cryorolled non-microalloyed TWIP 1 and Ti-microalloyed TWIP 2 steels exhibit distinct morphologies, with TWIP 1 showing a mixed mode of cleavage facets and dimples, while TWIP 2 displays quasi-cleavage fracture features, including fine dimples, cleavage facets, and a wedge-shaped crack. This research contributes to the development of advanced high-strength TWIP steels with improved properties for automotive and structural applications.</p>

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Effects of Cryorolling Deformation on Microstructure and Mechanical Properties of Dual-Phase TWIP Steels

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Swarup Kumar Ghosh

摘要

This study investigates the effect of cryorolling with 10 to 30% deformation at liquid nitrogen temperature on the microstructure and mechanical properties of ferrite–austenite dual-phase twinning-induced plasticity (TWIP) (Fe-0.06C-21Mn-3.5Al-3.10Si, wt.%) steels. The cryorolling with 30% deformation induces significant nanoscale deformation twinning (≈20 nm) and higher statistically stored dislocation density (1.21 × 1015 m− 2 to 1.84 × 1015 m− 2) and extrinsic stacking faults leading to a refinement of the microstructure with the higher grain aspect ratio (10:1 to 16:1) and continuous enhancement of hardness and strength properties with a concomitant decrease of ductility. The microstructural evolution and mechanical property enhancements are correlated with the mechanisms of deformation twinning, dislocation density increase, grain refinement, and suppression of dynamic recovery. For Ti-microalloyed TWIP steel, cryorolling at 30% deformation led to the maximum hardness (543 HV), yield strength (1132 MPa) and tensile strength (1428 MPa), with the corresponding increments of 62%, 53%, and 50%, respectively. The fracture surfaces of 30% cryorolled non-microalloyed TWIP 1 and Ti-microalloyed TWIP 2 steels exhibit distinct morphologies, with TWIP 1 showing a mixed mode of cleavage facets and dimples, while TWIP 2 displays quasi-cleavage fracture features, including fine dimples, cleavage facets, and a wedge-shaped crack. This research contributes to the development of advanced high-strength TWIP steels with improved properties for automotive and structural applications.