Study on Effect of Laser Peening on Inconel 718 Produced by DMLS Technique

Kumar, Nattudurai Navin; Yadav, Aditya; Raja, K.; Prabhakaran, S.; Naiju, C.D.; Kalainathan, S.

doi:10.4271/2019-28-0146

Cited by 6 publications

(1 citation statement)

References 16 publications

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“…When comparing the LSP along aluminium foil, which served as a sacrificial layer, with the as-deposited sample in the laser-deposited SS316L, Lu et al [44], determined that the hardness improved by 22% up to 1 mm with a substantial variance in CRS. Kumar et al [45], analyzed the impact of LSP with low pulse energy on the various types of sacrificial layers in additively manufactured alloy and reported that the CRS obtained on the uncoated surface was the highest. Further, SS316L subjected to LSP enhanced its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The impact of successive laser shock peening on surface integrity and residual stress distribution of laser powder-bed fused stainless steel 316L

Haribaskar,

Kumar

2024

Phys. Scr.

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The utilization of laser shock peening (LSP) in laser powder bed fused (LPBF) stainless steel (SS) 316L components enhances the mechanical characteristics and operational lifespan of the product quality through a significant reduction of residual stress and a noticeable increase in roughness parameters. The key objective of the study is to analyze the influence of consecutive laser shock peening (LSP) without ablative coating and low pulse energy on the surface properties, residual stress distribution, and microhardness of samples produced by LPBF with SS316L material. The surface quality of the sample subjected to consecutive laser shock peening shows a slight deterioration in its condition. This can be attributed to the combined impact of ablative surface and surface damage resulting from the production of high-energy plasma. However, the implementation of successive LSP results in a distinctive enhancement of compressive residual stresses (CRS) that are evenly distributed throughout the central axis and sharp edges. In contrast, the as-built condition exhibits non-uniform stress magnitudes. CRS observed in each LSP iteration exhibits a notable increase, reaching a maximum magnitude of -389 MPa compared to the initial stress level of 165 MPa in the as-built sample. This enhancement can be attributed to the repetitive impact of shock waves on the surface, leading to the formation of plastic deformation. The refinement of surface grains and the presence of favorable residual stresses were proven by the utilization of X-ray diffraction (XRD) studies and the Cos α plot. The XRD investigation also indicated the absence of any newly formed phases or secondary phases. A significant enhancement in microhardness was observed, with an increase of 58.3% achieved after the third consecutive peening process. The successive LSP samples displayed a gradual improvement in electrochemical behavior. Though the amplitude parameters increased after LSP, the increase in wear rate was observed.

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Section: Introductionmentioning

confidence: 99%