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<p>The stress relaxation test is a transient mechanical examination tool widely employed to investigate material deformation kinetics. This study reports the time-dependent plastic deformation response of additively manufactured (AM) SS316L under different heat treatment conditions. The thermal activation and deformation kinetics of the AM SS316L alloy were analyzed along with microstructural investigations. The stress-time response during relaxation was analyzed using a recently proposed constitutive model, and the dependence of activation volume, strain rate sensitivity and the exhaustion of mobile dislocation density were estimated for different heat treatment conditions. The results demonstrate a significant correlation between the exhaustion of mobile dislocations and cellular structure. Furthermore, potential mechanisms to provide a comprehensive understanding that governs the transient deformation response in AM SS316L alloy are discussed.</p> Graphical Abstract <p></p>

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Microstructure, Mechanical Behavior, and Time-Dependent Plasticity in Laser Powder-Bed Fusion Processed SS316L Alloy

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Kali Prasad,
  • Do Won Lee,
  • K. R. Ramkumar,
  • Soung Yeoul Ahn,
  • Sang Guk Jeong,
  • Eun Seong Kim,
  • Hariharan Krishnaswamy,
  • Jayant Jain,
  • Hyoung Seop Kim

摘要

The stress relaxation test is a transient mechanical examination tool widely employed to investigate material deformation kinetics. This study reports the time-dependent plastic deformation response of additively manufactured (AM) SS316L under different heat treatment conditions. The thermal activation and deformation kinetics of the AM SS316L alloy were analyzed along with microstructural investigations. The stress-time response during relaxation was analyzed using a recently proposed constitutive model, and the dependence of activation volume, strain rate sensitivity and the exhaustion of mobile dislocation density were estimated for different heat treatment conditions. The results demonstrate a significant correlation between the exhaustion of mobile dislocations and cellular structure. Furthermore, potential mechanisms to provide a comprehensive understanding that governs the transient deformation response in AM SS316L alloy are discussed.

Graphical Abstract