Effect of Height on Residual Stress Distribution in Laser Deposited Thin-Walled Parts

Shaoke Yao; Qing Peng; Zhengyang Li

doi:10.3788/LOP202259.0714007

Laser & Optoelectronics Progress, Volume. 59, Issue 7, 0714007(2022)

Effect of Height on Residual Stress Distribution in Laser Deposited Thin-Walled Parts

Shaoke Yao^1,2, Qing Peng^3、*, 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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Abstract Get PDF(in Chinese)

Figures & Tables(16)

Fig. 1. Mechanism for generating hollow-ring laser spot^[21]

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Fig. 2. Laser deposited specimen. (a) Front view; (b) top view

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Fig. 3. Geometrical model and meshing. (a) Geometrical model; (b) local view of mesh

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Fig. 4. Measured and simulated residual stresses

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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

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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

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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

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Fig. 8. S₃₃ distributions along path 2 of thin-walled parts with different heights

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Fig. 9. S₃₃ distributions at bottom of thin-walled parts with different heights

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Fig. 10. Stress analysis of isolated body

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Fig. 11. S₁₁ distributions along path 3 of thin-walled parts with different heights

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Fig. 12. S₁₁ distributions at top of thin-walled parts with different heights

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Table 1. Experimental process parameters

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Table 1. Experimental process parameters

Parameter	Content
Powder diameter /μm	50‒100
Laser power /W	800
Laser beam shape	Ring
Outside diameter of laser beam /mm	2.0
Inside diameter of laser beam /mm	1.3
Scanning speed /（mm⋅s^-1）	6
Powder feed rate /（g⋅min^-1）	10.9
Layer thickness /mm	0.3

Table 2. Test results of residual stress
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Table 2. Test results of residual stress
Point No. 1 2 3 4
Residual stress /MPa 83.2±212 242±138 298±156 -290±216

Table 3. Thermo-physical parameters of 316L stainless steel ^{[15, 25]}

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Table 3. Thermo-physical parameters of 316L stainless steel ^{[15, 25]}

Parameter	Content
Density ρ /（kg⋅m^-3）	8000
Specific heat C_p /（J⋅kg^-1⋅K^-1）	600
Conductivity of solid k_s/（W⋅m^-2⋅K^-1）	30
Melting point T_m /K	1673
Latent heat L /（kJ⋅kg^-1）	300
Conductivity of liquid k_l /（W⋅m^-2⋅K^-1）	30+10（T-1300）
Absorptivity A	0.35
Coefficient of convection h /（W⋅m^-2⋅K^-1）	30
Emissivity ε₀	0.8

Table 4. Mechanical performance parameters of 316L stainless steel ^{[15, 25]}

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Table 4. Mechanical performance parameters of 316L stainless steel ^{[15, 25]}

Temperature /℃	Young's modulus /GPa	Yield strength /MPa	Poisson's ratio	Thermal expansion coefficient /K^-1
20	195.6	297	0.29	1.5×10^-5
200	185.7	221	0.29	1.5×10^-5
400	172.6	202	0.29	1.5×10^-5
700	144.1	99	0.29	1.5×10^-5
1000	100.0	89	0.29	1.5×10^-5
1200	57.0	59	0.29	1.5×10^-5

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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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