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<p>This study investigates the influence of strain rate on the tensile behavior and acoustic emission (AE) characteristics of s30408 austenitic stainless steel, a material critical for cryogenic and corrosive environments. Uniaxial tensile tests were conducted at strain rates of 4.8 × 10<sup>− 4</sup>, 9.5 × 10<sup>− 4</sup>, and 1.9 × 10<sup>− 3</sup> s<sup>-1</sup>, with synchronized AE monitoring using a broadband transducer system. AE parameters, including amplitude, duration, ring-down counts, and energy, were analyzed to correlate microstructural damage mechanisms with deformation stages. Results demonstrated that increasing strain rates significantly elevated the occurrence of medium-high amplitude AE events (&gt; 60 dB) and total AE activity, attributed to accelerated dislocation dynamics, microcrack propagation, and phase transformations. Notably, specimens tested at 1.9 × 10<sup>− 3</sup> s<sup>-1</sup> exhibited distinct continuous-type AE signals during necking, corresponding to dislocation avalanches and energy superposition due to suppressed annihilation mechanisms at high strain rates. A power-law relationship was established between AE energy and signal duration, with deviations observed at high strain rates.</p>

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Acoustic Emission Characteristics of s30408 Steel During Tensile Test

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Q. Li,
  • X. Xie,
  • Y. Wang,
  • W. Pan,
  • W. Chen,
  • M. Chai

摘要

This study investigates the influence of strain rate on the tensile behavior and acoustic emission (AE) characteristics of s30408 austenitic stainless steel, a material critical for cryogenic and corrosive environments. Uniaxial tensile tests were conducted at strain rates of 4.8 × 10− 4, 9.5 × 10− 4, and 1.9 × 10− 3 s-1, with synchronized AE monitoring using a broadband transducer system. AE parameters, including amplitude, duration, ring-down counts, and energy, were analyzed to correlate microstructural damage mechanisms with deformation stages. Results demonstrated that increasing strain rates significantly elevated the occurrence of medium-high amplitude AE events (> 60 dB) and total AE activity, attributed to accelerated dislocation dynamics, microcrack propagation, and phase transformations. Notably, specimens tested at 1.9 × 10− 3 s-1 exhibited distinct continuous-type AE signals during necking, corresponding to dislocation avalanches and energy superposition due to suppressed annihilation mechanisms at high strain rates. A power-law relationship was established between AE energy and signal duration, with deviations observed at high strain rates.