Dislocation density-based study of grain refinement induced by laser shock peening

•A 3D FEM to model grain refinement induced by laser shock peening was developed.•Dislocation cell sizes decrease exponentially with peak laser shock wave pressure.•Dislocation cell sizes approach saturation gradually with laser power density. Laser shock peening (LSP) is an innovative surface proce...

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Bibliographic Details
Published in:Optics and laser technology 2020-01, Vol.121, p.105827, Article 105827
Main Authors: Wang, Cheng, Wang, Long, Wang, Chuan-Li, Li, Kun, Wang, Xiao-Gui
Format: Article
Language:English
Subjects:
Cell size
Computer simulation
Constitutive models
Copper
Dimpling
Dislocation density
Dislocation density evolution
Finite element method
Grain refinement
Laser shock peening
Laser shock processing
Lasers
Material properties
Mathematical models
Peening
Service life
Shock waves
Spatial distribution
Surface properties
Three dimensional models
Titanium
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Summary:•A 3D FEM to model grain refinement induced by laser shock peening was developed.•Dislocation cell sizes decrease exponentially with peak laser shock wave pressure.•Dislocation cell sizes approach saturation gradually with laser power density. Laser shock peening (LSP) is an innovative surface processing technique. Grain refinement induced by LSP has been proved to be feasible to improve the surface properties of materials and prolong the service life of metallic components. The three-dimensional finite element model, which incorporates a dislocation density-based constitutive model and the temporal-spatial distribution of laser shock wave, was adopted to simulate the process of grain refinement induced by LSP. The predicted dislocation cell sizes, dimple fabrications induced by the repetitive LSP of copper are in good agreement with experimental results, which confirms the validity of the dislocation density-based three-dimensional finite element model. The effects of laser spot overlap ratio and laser power density (peak laser shock wave pressure) on LSP-induced grain refinement were investigated in detail based on the numerical simulations of multiple LSP of copper and CP-Ti.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2019.105827