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Additively manufactured IN718 was studied in the as-printed (AP), solutionized (S), and heat treated (HT) conditions. Uniaxial compressive tests using the Split-Hopkinson pressure bar (SHPB) were conducted at 25 °C at high strain rates of 1000, 3000, 5000 s−1 to fit the Johnson-Cook (JC) plasticity model. The flow stress in the tested strain rate regime was highest for the HT condition and lowest for the S condition, consistent with the strengths observed at a strain rate of 10−3 s−1. In the high strain rate regime (1000–5000 s−1), no significant difference in the mechanical behavior was observed between AP-Longitudinal (L) and AP-Transverse (T) orientations, unlike the results at the strain rate of 10−3 s−1.

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High Strain Rate Deformation Behavior of Laser Powder Bed Fusion IN718

  • 会议论文

  • 发表日期：

    2026年

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  • Kartik Umate,
  • S. Karthikeyan,
  • Dheepa Srinivasan

摘要

Additively manufactured IN718 was studied in the as-printed (AP), solutionized (S), and heat treated (HT) conditions. Uniaxial compressive tests using the Split-Hopkinson pressure bar (SHPB) were conducted at 25 °C at high strain rates of 1000, 3000, 5000 s−1 to fit the Johnson-Cook (JC) plasticity model. The flow stress in the tested strain rate regime was highest for the HT condition and lowest for the S condition, consistent with the strengths observed at a strain rate of 10−3 s−1. In the high strain rate regime (1000–5000 s−1), no significant difference in the mechanical behavior was observed between AP-Longitudinal (L) and AP-Transverse (T) orientations, unlike the results at the strain rate of 10−3 s−1.