Prediction and Model Establishment of Inclined Surface Roughness of Laser Selective Melting Formed 316L Stainless Steel

Guang Yang; Kaibo Cheng; Shuo Zhao; Da An

doi:10.3788/CJL230607

Chinese Journal of Lasers, Volume. 50, Issue 20, 2002301(2023)

Prediction and Model Establishment of Inclined Surface Roughness of Laser Selective Melting Formed 316L Stainless Steel

Guang Yang^*, Kaibo Cheng, Shuo Zhao, and Da An

Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, Liaoning, China

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Figures & Tables(10)

Fig. 1. 316L stainless steel powder. (a) Particle size distribution; (b) SEM microscopic image

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Fig. 2. Printed samples in the experiment

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Fig. 3. Schematic diagram of laser selective melting principle

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Fig. 4. Schematic diagram of the step effect of the downward-inclined surface

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Fig. 5. Schematic diagrams of equivalent sticky powder. (a) Cross-sectional drawing; (b) top view; (c) three-dimensional drawing

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Fig. 6. Warpage calculation schematic

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Fig. 7. Comparison of measured and model predicted roughness

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Table 1. Chemical composition of 316L stainless steel powder
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Table 1. Chemical composition of 316L stainless steel powder
Element Mass fraction /%
Mn 2
P 0.05
Si 0.75
N 0.1
Cr 17
Ni 12
S 0.03
C 0.03

Table 2. Tangent equation and intersection expressions under different tilt angles
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Table 2. Tangent equation and intersection expressions under different tilt angles
α Tangent equation Intersection（x， y）
45°≤α≤α₁ $y = t a n α \cdot x + (1 - c o s α) R_{1} - h - \frac{a}{2} \cdot t a n α \cdot s i n α$ $(x_{1}, y_{1})$
α₁≤α≤90° $y = t a n α \cdot x + (1 - c o s α) R_{1} - h - \frac{a}{2} \cdot t a n α \cdot s i n α$ $(x_{2}, y_{2})$

Table 3. Measured roughness of downward-inclined surface

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Table 3. Measured roughness of downward-inclined surface

α /（°）	Roughness /μm			Average roughness /μm
α /（°）	First measurement	Second measurement	Third measurement	Average roughness /μm
45	11.276	12.093	11.583	11.651
50	10.683	10.52	10.812	10.672
55	9.765	8.512	8.924	9.067
60	9.004	7.921	8.254	8.393
65	7.215	7.945	7.352	7.504
70	7.942	8.250	8.324	8.172
75	7.728	7.115	7.783	7.542
80	6.721	7.774	7.591	7.362
85	7.058	8.074	7.632	7.588
90	6.674	7.059	7.112	6.948

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Guang Yang, Kaibo Cheng, Shuo Zhao, Da An. Prediction and Model Establishment of Inclined Surface Roughness of Laser Selective Melting Formed 316L Stainless Steel[J]. Chinese Journal of Lasers, 2023, 50(20): 2002301

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