doi: 10.52899/24141437_2025_03_355
UDK: 621.373.826

Effect of Gas Flow on Samples Produced by Selective Laser Melting

Мианджи З. ., Кобицкий А. Ю., Черноволов В. В., Жуков Р. М., Тужилин Д. Н., Раевский Е. В.
Article language: English
Citation Link: Mianji Z, Kobitsky AYu, Chernovolov VV, Zhukov RM, Tuzhilin DN, Rayevsky EV. Effect of Gas Flow on Samples Produced by Selective Laser Melting. Transactions of the Saint Petersburg State Marine Technical University. 2025;4(3):355–364. DOI: 10.52899/24141437_2025_03_355 EDN: KVUPAF

Annotation

BACKGROUND: Selective laser melting (SLM) is a technology for manufacturing metal parts by melting particles of metal powder compositions using laser radiation. SLM provides excellent mechanical properties of manufactured parts and large discretion of design. The paper studies the effect of laser power on the spattering of molten powder. The study analyzed the causes, appearance, and composition of spatter and methods to prevent it. The SLM is performed in shielding inert gas; thus, it has been shown that the gas flow is a decisive factor as it removes condensate and prevents oxidation of the material during melting. The solidified spatter has an average size of approximately 162 μm, which is significantly larger than the initial powder size of 32 μm. AIM: To analyze the spatter of stainless steel powder during processing and the effect of gas flow on sample quality, especially its porosity. RESULTS: The study showed that gas flow rate significantly affects the uniformity of the properties of manufactured products. The properties of the manufactured parts varied based on the location of the samples on the platform. The quality of the manufactured parts was higher when placed in areas with high gas flow rate and lower when placed in areas with low gas flow rate. CONCLUSION: The study may be used to predict and test the quality of parts manufactured using the SLM. Keywords: selective laser melting; porosity; flow rate; spatter; laminarizer.

Bibliography

1. Bin A., Halimi I., Pham Q. Spatter transport by inert gas flow in selective laser melting: A simulation study // Powder Technol. 2019. Vol. 352. P. 103–116. doi: 10.1016/j.powtec.2019.04.044
2. Bin A.A., Pham Q. Study of the spatter distribution on the powder bed during selective laser melting // Addit. Manuf. 2018. Vol. 22. P. 86–97. doi: 10.1016/j.addma.2018.04.036
3. Khairallah S.A., Anderson A.T., Rubenchik A., King W.E. Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones // Acta Materialia. 2016. Vol. 108. P. 36–45. doi: 10.1016/j.actamat.2016.02.014 EDN: WUOJWR
4. Manyalibo J.M. Metal vapor micro-jet controls material redistribution in laser powder bed fusion additive manufacturing // Sci. Rep. 2017. Vol. 7, N. 1. P. 1–12. doi: 10.1038/s41598-017-04237-z
5. Read N., Wang W., Essa Kh., Attallah M.M. Selective laser melting of AlSi10Mg alloy: Process optimisation and mechanical properties development // Mater. Des. 2015. Vol. 65. P. 417–424. doi: 10.1016/j.matdes.2014.09.044
6. Wang D., Wu Sh., Fu F., et al. Mechanism and characteristics of spatter generation in SLM processing and its effect on the properties // Mater. Des. 2016. Vol. 117. P. 121–130. doi: 10.1016/j.matdes.2016.12.060
7. Low D.K.Y., Li L., Corfe A.G. Effects of assist gas on the physical characteristics of spatter during laser percussion drilling of NIMONIC 263 alloy // Appl. Surf. Sci. 2000. Vol. 154–155. P. 689–695. doi: 10.1016/S0169-4332(99)00427-4 EDN: JIEYTI
8. Bidare P., Bitharas I., Ward R.M., et al. Fluid and particle dynamics in laser powder bed fusion // Acta Mater. 2018. Vol. 142. P. 107–120. doi: 10.1016/j.actamat.2017.09.051
9. Wang T., Dai Sh., Liao H., Zhu H. Pores and the formation mechanisms of SLMed AlSi10Mg // Rapid Prototyping Journal. 2020. Vol. 26, N. 9. P. 1657–1664. doi: 10.1108/rpj-02-2020-0036 EDN: GOQBNP
10. Nguyen D.S. Park H.S., Lee C.M. Effect of cleaning gas stream on products in selective laser melting // Mater. Manuf. Process. 2018. Vol. 34, № 4. P. 364–370. doi: 10.1080/10426914.2018.1512132
11. Pal S., Drstvenšek I., Brajlih T. Physical behaviors of materials in selective laser melting process // Strojniški vestnik — Journal of Mechanical Engineering. 2018. Vol. 64, № 12. P. 695–707. doi: 10.2507/daaam.scibook.2018.21