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<p>This work investigates the effect of heat treatment and laser shock peening (LSP) on the corrosion performance of 316L stainless steel (316L SS) fabricated by laser powder bed fusion (LPBF). Heat treatment increases the grain size and the high-angle grain boundaries (HAGBs). LSP refines the grain structure by increasing low-angle grain boundaries (LAGBs), as revealed by electron backscattered diffraction (EBSD) analysis. LSP generates high-pressure shock waves that induce severe plastic deformation, thereby enhancing both grain refinement and corrosion resistance. Corrosion behavior was assessed using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in a 3.5 wt.% NaCl solution. Compared to all samples, the heat-treated with LSP (HT + LSP) sample showed the best corrosion resistance (2168.44 ± 30.34 Ω·cm<sup>2</sup>), due to its refined microstructure and low surface wettability. The LSP transforms the surface from hydrophilic to hydrophobic. The field-emission scanning electron microscope (FESEM) images of the corroded surfaces revealed pitting corrosion. These results highlight that heat treatment and LSP can effectively improve the corrosion behavior of 316L SS parts fabricated by LPBF.</p> Graphical Abstract <p></p>

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Investigation of Microstructural and Corrosion Behavior of Heat Treated and Laser Shock Peened Additively Manufactured 316L SS Parts

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • M. Veluchamy,
  • Somasundaram Kumanan

摘要

This work investigates the effect of heat treatment and laser shock peening (LSP) on the corrosion performance of 316L stainless steel (316L SS) fabricated by laser powder bed fusion (LPBF). Heat treatment increases the grain size and the high-angle grain boundaries (HAGBs). LSP refines the grain structure by increasing low-angle grain boundaries (LAGBs), as revealed by electron backscattered diffraction (EBSD) analysis. LSP generates high-pressure shock waves that induce severe plastic deformation, thereby enhancing both grain refinement and corrosion resistance. Corrosion behavior was assessed using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in a 3.5 wt.% NaCl solution. Compared to all samples, the heat-treated with LSP (HT + LSP) sample showed the best corrosion resistance (2168.44 ± 30.34 Ω·cm2), due to its refined microstructure and low surface wettability. The LSP transforms the surface from hydrophilic to hydrophobic. The field-emission scanning electron microscope (FESEM) images of the corroded surfaces revealed pitting corrosion. These results highlight that heat treatment and LSP can effectively improve the corrosion behavior of 316L SS parts fabricated by LPBF.

Graphical Abstract