Effect of Different Heat-Source Models on Calculated Temperature Field of Selective Laser Melted 18Ni300

Xinlei Luo; Meihong Liu; Zhenhua Li; Huaiyang Li; Jibiao Shen

doi:10.3788/CJL202148.1402005

Chinese Journal of Lasers, Volume. 48, Issue 14, 1402005(2021)

Effect of Different Heat-Source Models on Calculated Temperature Field of Selective Laser Melted 18Ni300

Xinlei Luo¹, Meihong Liu¹, Zhenhua Li^2、*, Huaiyang Li², and Jibiao Shen²

¹School of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China

²School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China

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Figures & Tables(11)

Fig. 1. Sketches of different heat source models. (a) Energy distribution of Gaussian surface heat source; (b) double ellipsoid heat source model^[2]

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Fig. 2. Finite element model. (a) Finite element mesh for substrate and powder; (b) local enlargement

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Fig. 3. Calculated temperature fields by different heat source models. (a) Double ellipsoid heat source; (b) Gaussian surface heat source

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Fig. 4. Calculated temperature of different nodes by different heat source models. (a) Location of nodes; (b) calculated temperature cycle curves of different nodes; (c) calculated maximum temperature of nodes in scanning line

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Fig. 5. Calculated molten pool sizes by different heat source models. (a) Calculated molten pool width by double ellipsoid heat source model; (b) calculated molten pool width by Gaussian surface heat source model; (c) calculated molten pool depth by double ellipsoid heat source model; (d) calculated molten pool depth by Gaussian surface heat source model

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Fig. 6. Molten pool sizes obtained by two kinds of heat sources under different laser powers. (a) 150 W; (b) 180 W; (c) 210 W; (d) 240 W; (e) 270 W

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Fig. 7. Slices of single-pass selective laser melting. (a) Macro morphology; (b) SEM image of the slices formed at different scanning speeds (laser power of 210 W)

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Fig. 8. Comparison between the molten pool width obtained by different heat source models and experimental results. (a) 150 W; (b) 180 W; (c) 210 W; (d) 240 W; (e) 270 W

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Table 1. Thermal conductivity and specific heat capacity of 18Ni300 metal powder
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Table 1. Thermal conductivity and specific heat capacity of 18Ni300 metal powder
Temperature /K Thermal conductivity /(W·m^-1·K^-1) Specific heat capacity /(J·kg^-1·K^-1 )
21 14.3 474.6
537 14.3 474.8
815 20.1 575.3
982 25.1 629.4
1093 26.4 661.9
1300 28.6 720.0

Table 2. Thermophysical parameters of structural steel
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Table 2. Thermophysical parameters of structural steel
Density /(kg·m^-3) Thermal conductivity /(W·m^-1·K^-1) Specific heat capacity /(J·kg^-1·K^-1)
7850 60.5 434

Table 3. Effect of laser power and scanning speed on calculated molten pool width and depth under the same line energy density

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Table 3. Effect of laser power and scanning speed on calculated molten pool width and depth under the same line energy density

P /v( line energy density)/(W·mm^-1·s)	P(laser power)/W	v(scanning speed)/(mm·s^-1)	Width obtained by double ellipsoid model/μm	Depth obtained by double ellipsoid model/μm	Width obtained by Gaussian model/μm	Depth obtained by Gaussian model/μm
0.3	150	500	144.6	85.2	149.0	39.1
0.3	180	600	145.0	90.6	150.4	39.4
0.3	210	700	147.0	94.0	151.2	39.7
0.3	240	800	147.8	97.1	150.0	40.0
0.3	270	900	148.6	98.4	151.8	40.0

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Xinlei Luo, Meihong Liu, Zhenhua Li, Huaiyang Li, Jibiao Shen. Effect of Different Heat-Source Models on Calculated Temperature Field of Selective Laser Melted 18Ni300[J]. Chinese Journal of Lasers, 2021, 48(14): 1402005

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Paper Information

Category: laser manufacturing

Received: Dec. 29, 2020

Accepted: Jan. 21, 2021

Published Online: Jul. 5, 2021

The Author Email: Zhenhua Li (lzhkust@sina.com)

DOI:10.3788/CJL202148.1402005

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Thermal conductivity and specific heat capacity of 18Ni300 metal powder

Table 1. Thermal conductivity and specific heat capacity of 18Ni300 metal powder

Table 2. Thermophysical parameters of structural steel

Table 2. Thermophysical parameters of structural steel

Table 3. Effect of laser power and scanning speed on calculated molten pool width and depth under the same line energy density

Table 3. Effect of laser power and scanning speed on calculated molten pool width and depth under the same line energy density