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<p>This work investigates the effects of heat treatment and laser shock peening (LSP) on the nanomechanical behavior of SS316L fabricated by selective laser melting (SLM). The nanoindentation, microstructural studies, phase analysis, and microhardness testing were performed under different conditions. Microstructural analysis revealed columnar structure in the as-built sample and annealing twins in the heat-treated sample. The LSP induced a high-pressure shock wave, causing severe plastic deformation and grain refinement. Phase analysis confirmed the presence of the face-centered cubic (FCC) austenite (<i>γ</i>) phase with no new crystalline phases. The LSP impacts increased FWHM values due to enhanced microstrain and grain refinement in LSP samples. The surface microhardness, reduced modulus, nanohardness, plastic deformation, elastic modulus, and contact stiffness of the AB + LSP sample improved by 25.81, 7.25, 24.70, 63.63, 8.97, and 9.91% as compared to the AB sample. Similarly, the HT + LSP sample showed improvements by 18.18, 6.78, 28.46, 81.27, 8.14, and 16.06% in these properties compared to the HT sample. The indentation depth and creep of AB + LSP reduced by 49.05 and 30.76%, while for HT + LSP, they reduced by 25.27 and 26.92%, respectively. These findings confirm that LSP effectively enhances the surface strength and durability of SS316L.</p> Graphical Abstract <p></p>

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Microstructural and Mechanical Characterization of Heat-Treated and Laser Shock-Peened SS316L Fabricated by Selective Laser Melting

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • M. Veluchamy,
  • Somasundaram Kumanan

摘要

This work investigates the effects of heat treatment and laser shock peening (LSP) on the nanomechanical behavior of SS316L fabricated by selective laser melting (SLM). The nanoindentation, microstructural studies, phase analysis, and microhardness testing were performed under different conditions. Microstructural analysis revealed columnar structure in the as-built sample and annealing twins in the heat-treated sample. The LSP induced a high-pressure shock wave, causing severe plastic deformation and grain refinement. Phase analysis confirmed the presence of the face-centered cubic (FCC) austenite (γ) phase with no new crystalline phases. The LSP impacts increased FWHM values due to enhanced microstrain and grain refinement in LSP samples. The surface microhardness, reduced modulus, nanohardness, plastic deformation, elastic modulus, and contact stiffness of the AB + LSP sample improved by 25.81, 7.25, 24.70, 63.63, 8.97, and 9.91% as compared to the AB sample. Similarly, the HT + LSP sample showed improvements by 18.18, 6.78, 28.46, 81.27, 8.14, and 16.06% in these properties compared to the HT sample. The indentation depth and creep of AB + LSP reduced by 49.05 and 30.76%, while for HT + LSP, they reduced by 25.27 and 26.92%, respectively. These findings confirm that LSP effectively enhances the surface strength and durability of SS316L.

Graphical Abstract