Evolution Mechanism of Powder Properties of Recycled 316L Stainless Steel in Selective Laser Melting

Chao Lu; Mengzhi Xiao; Yuebo Qu; Yan Yin; Ruihua Zhang

doi:10.3788/CJL202148.1402009

Chinese Journal of Lasers, Volume. 48, Issue 14, 1402009(2021)

Evolution Mechanism of Powder Properties of Recycled 316L Stainless Steel in Selective Laser Melting

Chao Lu¹, Mengzhi Xiao¹, Yuebo Qu¹, Yan Yin^2,3, and Ruihua Zhang^1,2、*

Author Affiliations

¹Central Iron & Steel Research Institute, Beijing 100081, China;

²Hard-Ware Knife Cut Industrial Technology Research Institute Yangjiang, Yangjiang, Guangdong 529533, China

³Lanzhou University of Technology, Lanzhou, Gansu 730050, China

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Figures & Tables(10)

Fig. 1. SLM-280 forming equipment. (a) Equipment appearance; (b) indoor structure of forming chamber

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Fig. 2. Particle size distribution of recycled 316L stainless steel powder

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Fig. 3. Surface morphologies of recycled 316L stainless steel powder. (a) Virgin powder; (b) 10 times recycle; (c) 30 times recycle

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Fig. 4. EDS spectra of oxidation spots on the surface of powder with 30 times recycle. (a)(b) Powder with oxidation spots; (c)--(e) EDS spectra of each point

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Fig. 5. EDS-Mapping of round and black oxidation spots on the surface of powder with 30 times recycle

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Fig. 6. Surface microstructures of recycled 316L stainless steel powder. (a) Virgin powder; (b) 10 times recycle; (c) 30 times recycle

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Fig. 7. Schematic of laser-powder-molten pool interaction

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Fig. 8. Magnetization of 316L stainless steel powder during recycle. (a)(c) Photos before and after the test for initial powder; (b)(d) photos before and after the test for 30 times recycled powder

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Table 1. Physical properties of recycled 316L stainless steel powder
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Table 1. Physical properties of recycled 316L stainless steel powder
Powder D₁₀/μm D₅₀/μm D₉₀/μm Apparent density /(g·cm^-3) Tap density /(g·cm^-3) Flow rate /[s·(50 g)^-1]
R0 15.5 30.0 50.4 4.52 5.12 19.2
R10 17.0 32.3 53.3 4.50 5.08 18.9
R30 19.6 35.5 57.7 4.47 5.02 18.0

Table 2. EDS analysis of oxidation spots on the surface of powder with 30 times recycle
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Table 2. EDS analysis of oxidation spots on the surface of powder with 30 times recycle
Position Mass fraction /%
Fe Cr Ni Mo Mn Si C O
Point 1 20.55 8.99 3.45 — 11.99 9.63 7.71 37.68
Point 3 25.83 12.43 4.78 — 10.52 9.32 4.78 32.34
Point 2 56.16 14.66 9.66 2.71 1.20 1.20 14.41 —

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Chao Lu, Mengzhi Xiao, Yuebo Qu, Yan Yin, Ruihua Zhang. Evolution Mechanism of Powder Properties of Recycled 316L Stainless Steel in Selective Laser Melting[J]. Chinese Journal of Lasers, 2021, 48(14): 1402009

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