• Laser & Optoelectronics Progress
  • Vol. 59, Issue 7, 0714007 (2022)
Shaoke Yao1、2, Qing Peng3、*, and Zhengyang Li2
Author Affiliations
  • 1School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
  • 2Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
  • 3The State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
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    DOI: 10.3788/LOP202259.0714007 Cite this Article Set citation alerts
    Shaoke Yao, Qing Peng, Zhengyang Li. Effect of Height on Residual Stress Distribution in Laser Deposited Thin-Walled Parts[J]. Laser & Optoelectronics Progress, 2022, 59(7): 0714007 Copy Citation Text show less
    Mechanism for generating hollow-ring laser spot[21]
    Fig. 1. Mechanism for generating hollow-ring laser spot[21]
    Laser deposited specimen. (a) Front view; (b) top view
    Fig. 2. Laser deposited specimen. (a) Front view; (b) top view
    Geometrical model and meshing. (a) Geometrical model; (b) local view of mesh
    Fig. 3. Geometrical model and meshing. (a) Geometrical model; (b) local view of mesh
    Measured and simulated residual stresses
    Fig. 4. Measured and simulated residual stresses
    Stress field and deformation of thin-wall part after deposition. (a) S11; (b) S22; (c) S33; (d) Mises stress; (e) schematic of deformation
    Fig. 5. Stress field and deformation of thin-wall part after deposition. (a) S11; (b) S22; (c) S33; (d) Mises stress; (e) schematic of deformation
    Stress component S11 of thin-walled parts with different heights. (a) 1 layer; (b) 11 layers; (c) 21 layers; (d) 31 layers; (e) 41 layers; (f) 50 layers
    Fig. 6. Stress component S11 of thin-walled parts with different heights. (a) 1 layer; (b) 11 layers; (c) 21 layers; (d) 31 layers; (e) 41 layers; (f) 50 layers
    S11 distribution. (a) S11 distributions along height of thin-walled part with different heights; (b) schematic of vertical path; (c) critical point position versus height of thin-walled part; (d) boundary stress versus height of thin-walled part
    Fig. 7. S11 distribution. (a) S11 distributions along height of thin-walled part with different heights; (b) schematic of vertical path; (c) critical point position versus height of thin-walled part; (d) boundary stress versus height of thin-walled part
    S33 distributions along path 2 of thin-walled parts with different heights
    Fig. 8. S33 distributions along path 2 of thin-walled parts with different heights
    S33 distributions at bottom of thin-walled parts with different heights
    Fig. 9. S33 distributions at bottom of thin-walled parts with different heights
    Stress analysis of isolated body
    Fig. 10. Stress analysis of isolated body
    S11 distributions along path 3 of thin-walled parts with different heights
    Fig. 11. S11 distributions along path 3 of thin-walled parts with different heights
    S11 distributions at top of thin-walled parts with different heights
    Fig. 12. S11 distributions at top of thin-walled parts with different heights
    ParameterContent
    Powder diameter /μm50‒100
    Laser power /W800
    Laser beam shapeRing
    Outside diameter of laser beam /mm2.0
    Inside diameter of laser beam /mm1.3
    Scanning speed /(mm⋅s-16
    Powder feed rate /(g⋅min-110.9
    Layer thickness /mm0.3
    Table 1. Experimental process parameters
    Point No.1234
    Residual stress /MPa83.2±212242±138298±156-290±216
    Table 2. Test results of residual stress
    ParameterContent
    Density ρ /(kg⋅m-38000
    Specific heat Cp /(J⋅kg-1⋅K-1600
    Conductivity of solid ks/(W⋅m-2⋅K-130
    Melting point Tm /K1673
    Latent heat L /(kJ⋅kg-1300
    Conductivity of liquid kl /(W⋅m-2⋅K-130+10(T-1300)
    Absorptivity A0.35
    Coefficient of convection h /(W⋅m-2⋅K-130
    Emissivity ε00.8
    Table 3. Thermo-physical parameters of 316L stainless steel [15, 25]
    Temperature /℃Young's modulus /GPaYield strength /MPaPoisson's ratioThermal expansion coefficient /K-1
    20195.62970.291.5×10-5
    200185.72210.291.5×10-5
    400172.62020.291.5×10-5
    700144.1990.291.5×10-5
    1000100.0890.291.5×10-5
    120057.0590.291.5×10-5
    Table 4. Mechanical performance parameters of 316L stainless steel [15, 25]
    Shaoke Yao, Qing Peng, Zhengyang Li. Effect of Height on Residual Stress Distribution in Laser Deposited Thin-Walled Parts[J]. Laser & Optoelectronics Progress, 2022, 59(7): 0714007
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