Performance Differences of Support Structures for Parts Formed by Selective Laser Melting

Yali Yi; Yangyang Cheng; Changzhi Jia; Herong Jin

doi:10.3788/CJL221225

Chinese Journal of Lasers, Volume. 50, Issue 16, 1602306(2023)

Performance Differences of Support Structures for Parts Formed by Selective Laser Melting

Yali Yi¹, Yangyang Cheng^1,2, Changzhi Jia^2、*, and Herong Jin¹

Author Affiliations

¹School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China

²Artillery Engineering Department, Shijiazhuang Branch, Army Engineering University, Shijiazhuang 050003, Hebei, China

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Abstract Get PDF(in Chinese)

Figures & Tables(22)

Fig. 1. Cantilevered plate and three support structures for SLM. (a) Cantilevered plate; (b) cone-type support structure; (c) block-type support structure; (d) combination-type support structure

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Fig. 2. Bottom view and design parameters of support structure. (a) Bottom view of support sample; (b) design parameters of block-type support

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Fig. 3. Variable layer height method for additive manufacturing simulation

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Fig. 4. Mesh topography for support samples

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Fig. 5. Boundary and initial conditions applied to model

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Fig. 6. Temperature fields of formed samples at end of printing. (a) Cone-type support sample; (b) block-type support sample; (c) combination-type support sample

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Fig. 7. Vertical paths defined to capture temperature and temperature distribution. (a) Cone-type support sample; (b) block-type support sample; (c) combination-type support sample; (d) vertical temperature distribution plots for support samples

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Fig. 8. Horizontal paths defined to capture temperature and temperature distribution. (a) Cone-type support sample; (b) block-type support sample; (c) combination-type support sample; (d) horizontal temperature distribution plots for support samples

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Fig. 9. Measurement of warping height of SLM forming samples

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Fig. 10. SLM forming samples. (a) Cone-type support sample; (b) block-type support sample; (c) combination-type support sample

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Fig. 11. SEM images of lower surfaces of samples with different support types after support is removed. (a) Position of observation area; (b) cone-type support sample; (c) block-type support sample; (d) combination-type support sample

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Fig. 12. Three-dimensional morphologies of lower surfaces of samples with different support types after support is removed. (a) Cone-type support sample; (b) block-type support sample; (c) combination-type support sample

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Fig. 13. Metallographic diagrams of samples with different support types. (a) Position of observation area; (b) cone-type support sample; (c) block-type support sample; (d) combination-type support sample

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Fig. 14. SEM image of defect area of block-type support sample

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Fig. 15. Elemental segregation morphologies of 316L metal microstructure. (a) Position of measurement point; (b) Fe element; (c) Cr element; (d) Ni element

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Fig. 16. EPMA energy spectrum analysis results of elemental compositions. (a) CH4 channel; (b) CH3 channel; (c) CH2 channel; (d) CH1 channel

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Fig. 17. Forming height-hardness curves of SLM forming samples

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Table 1. Design parameters of three support structures

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Table 1. Design parameters of three support structures

Support type	d /mm	Wall thickness / mm	Total contact area between support and part /mm²
Cone-type support	0.7	Φ1	113.10
Block-type support	0.7	0.2	53.19
Combination-type support	1.5（cone），	Φ1（cone），	59.63
Combination-type support	0.7（block）	0.1（block）	59.63

Table 2. Chemical compositions of 316L powder
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Table 2. Chemical compositions of 316L powder
Element Cr Ni Mn Mo Si S P Fe
Mass fraction /% 16.900 10.710 0.750 2.380 0.690 0.002 0.026 Bal.

Table 3. Process parameters of SLM equipment

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Table 3. Process parameters of SLM equipment

Process parameter	Value
Laser power for solid /W	150
Laser power for support /W	70
Scan speed for solid /（mm·s^-1）	800
Scan speed for support /（mm·s^-1）	900
Hatching distance /mm	0.08
Layer thickness /mm	0.02
Start plate temperature /℃	22

Table 4. Deformation heights of samples after support is removed
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Table 4. Deformation heights of samples after support is removed
Sample Measuring line 1 Measuring line 2 Measuring line 3 Average value
Cone-type support sample 5.60 5.50 5.64 5.58
Block-type support sample 6.72 6.22 6.80 6.58
Combination-type support sample 5.34 5.12 5.40 5.29

Table 5. Chemical compositions of measurement point and 316L powder (mass fraction, %)
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Table 5. Chemical compositions of measurement point and 316L powder (mass fraction, %)
Element Cr Ni Mn Mo Si Fe
Point 18.03 11.06 0.75 1.62 0.57 67.59
316L powder 16.90 10.71 0.75 2.38 0.69 68.54

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Yali Yi, Yangyang Cheng, Changzhi Jia, Herong Jin. Performance Differences of Support Structures for Parts Formed by Selective Laser Melting[J]. Chinese Journal of Lasers, 2023, 50(16): 1602306

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