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<p>This research examines the combined effects of heat treatment and double-sided laser shock peening (LSP) on additively manufactured (AM) 316L stainless steel (316L SS) produced using laser powder bed fusion (L-PBF). The focus is on changes in microstructure, porosity, element distribution, residual stress, microhardness, and mechanical properties. The as-built (AB) specimen showed a columnar microstructure, after heat treatment, led to the formation of annealing twins. LSP introduced high-pressure shock waves, causing severe plastic deformation (SPD) and grain refinement, which reduced porosity from 0.3% to 0.16% in the AB specimen and from 0.22% to 0.10% in the heat-treated (HT) specimen. The energy-dispersive X-ray spectroscopy (EDS) analysis confirmed oxide layer formation after LSP, with increased carbon and oxygen and reduced iron, chromium, and nickel content on the surface. Compressive residual stress was developed due to LSP, as observed in both AB + LSP and HT + LSP specimens on both surfaces. The bottom surface microhardness increased by 25.8% for AB + LSP and 18.1% for HT + LSP, and on the top surface, it increased by 26.1% and 19.37%, respectively. LSP significantly improved the ultimate tensile strength (UTS) and yield strength (YS), with a slight reduction in elongation (El).</p>

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Effect of Double-Side Laser Shock Peening on Tensile Behavior of Selective Laser-Melted 316L SS Parts

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • M. Veluchamy,
  • Somasundaram Kumanan

摘要

This research examines the combined effects of heat treatment and double-sided laser shock peening (LSP) on additively manufactured (AM) 316L stainless steel (316L SS) produced using laser powder bed fusion (L-PBF). The focus is on changes in microstructure, porosity, element distribution, residual stress, microhardness, and mechanical properties. The as-built (AB) specimen showed a columnar microstructure, after heat treatment, led to the formation of annealing twins. LSP introduced high-pressure shock waves, causing severe plastic deformation (SPD) and grain refinement, which reduced porosity from 0.3% to 0.16% in the AB specimen and from 0.22% to 0.10% in the heat-treated (HT) specimen. The energy-dispersive X-ray spectroscopy (EDS) analysis confirmed oxide layer formation after LSP, with increased carbon and oxygen and reduced iron, chromium, and nickel content on the surface. Compressive residual stress was developed due to LSP, as observed in both AB + LSP and HT + LSP specimens on both surfaces. The bottom surface microhardness increased by 25.8% for AB + LSP and 18.1% for HT + LSP, and on the top surface, it increased by 26.1% and 19.37%, respectively. LSP significantly improved the ultimate tensile strength (UTS) and yield strength (YS), with a slight reduction in elongation (El).