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<p>The deformation behavior of duplex low-density steel with moderate stacking fault energy (62.3&#xa0;mJ/m<sup>2</sup>) is highly dependent on the strain rate. At a high strain rate (10<sup>−1</sup>&#xa0;s<sup>−1</sup>), a significantly higher density of deformation twins and microbands is introduced into the matrix, in addition to planar slip and martensite transformation. This results in a notable increase in the ultimate tensile strength by approximately 90&#xa0;MPa (an 11.4% increase) and total elongation by about 17.5% (a 120.7% increase), compared to the low strain rate of 10<sup>−5</sup>&#xa0;s<sup>−1</sup>. It is hoped that this experimental study will inspire mechanistic modeling efforts using crystal plasticity, particularly focusing on strain rate sensitivity and twinning, to predict the performance of duplex low-density steel.</p>

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Strain Rate-Dependent Tensile Properties of Duplex Low-Density Steel

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Tianrui Li,
  • Wenxuan Gan,
  • Zhenggang Yang,
  • Longsheng Gong,
  • Yong Yang,
  • Xiaofeng Zhang

摘要

The deformation behavior of duplex low-density steel with moderate stacking fault energy (62.3 mJ/m2) is highly dependent on the strain rate. At a high strain rate (10−1 s−1), a significantly higher density of deformation twins and microbands is introduced into the matrix, in addition to planar slip and martensite transformation. This results in a notable increase in the ultimate tensile strength by approximately 90 MPa (an 11.4% increase) and total elongation by about 17.5% (a 120.7% increase), compared to the low strain rate of 10−5 s−1. It is hoped that this experimental study will inspire mechanistic modeling efforts using crystal plasticity, particularly focusing on strain rate sensitivity and twinning, to predict the performance of duplex low-density steel.