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<p>Twinning-induced plasticity (TWIP) steels have attracted considerable attention for their exceptional strength−ductility synergy, but their dynamic mechanical behavior and microstructural evolution under high-strain-rate loading remain poorly understood. This work investigates shock response and spall damage of a TWIP steel, 20Mn23AlV, via plate impact experiments. The individual effects of peak stress and grain size are systematically examined. The Hugoniot equation of state is obtained for peak shock stress up to 36 GPa. This steel exhibits better spall strength (2.7−3.1 GPa) compared to most other ductile steels. Spall strength increases with increasing peak stress, but is weakly dependent on grain size (7−171 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\upmu\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">μ</mi> </math></EquationSource> </InlineEquation>m). Shock compression deformation mechanisms include dislocation slip, stacking fault, Lomer–Cottrell lock and deformation twinning. Spall damage is primarily ductile in nature. The fracture mode transitions from intragranular to intergranular damage with decreasing grain size.</p>

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Shock compression and spall response of a twinning-induced plasticity steel: effects of peak stress and grain size

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • T. Zhang,
  • Y. L. Bian,
  • Tao Yang,
  • S. H. Guo,
  • Y. Cai,
  • L. X. Li,
  • S. N. Luo

摘要

Twinning-induced plasticity (TWIP) steels have attracted considerable attention for their exceptional strength−ductility synergy, but their dynamic mechanical behavior and microstructural evolution under high-strain-rate loading remain poorly understood. This work investigates shock response and spall damage of a TWIP steel, 20Mn23AlV, via plate impact experiments. The individual effects of peak stress and grain size are systematically examined. The Hugoniot equation of state is obtained for peak shock stress up to 36 GPa. This steel exhibits better spall strength (2.7−3.1 GPa) compared to most other ductile steels. Spall strength increases with increasing peak stress, but is weakly dependent on grain size (7−171 \(\upmu\) μ m). Shock compression deformation mechanisms include dislocation slip, stacking fault, Lomer–Cottrell lock and deformation twinning. Spall damage is primarily ductile in nature. The fracture mode transitions from intragranular to intergranular damage with decreasing grain size.