In-situ powder mixing for laser-based directed energy deposition of functionally graded materials

Abstract

The mixing of powders is a highly relevant field under additive manufacturing, however, it has attracted limited interest to date. The in-situ mixing of various powders remains a significant challenge. This paper proposes a new method utilizing a static mixer for the in-situ mixing of multiple powders through the laser-based directed energy deposition (DED) of functionally graded materials. Firstly, a powder-mixing experimental platform was established; WC and 316L powders were selected for the mixing experiments. Secondly, scanning electron microscopy, energy dispersive spectroscopy, and image processing were used to visually evaluate the homogeneity and proportion of the in-situ mixed powder. Furthermore, powder-mixing simulations were conducted to determine the powder-mixing mechanism. In the simulations, a powder carrier gas flow field and particle mixing were employed. Finally, a WC/316L metal matrix composite sample was produced using laser-based DED to verify the application potential of the static mixer. It was found that the static mixer could adjust the powder ratio online, and a response time of 1–2 s should be considered when adjusting the ratio of the mixed powder. A feasible approach for in-situ powder mixing for laser-based DED was demonstrated and investigated, creating the basis for functionally graded materials.

Keywords

Laser / Deposition / Static mixer / Powder mixing / Functionally graded materials

References

[1.] Benoit MJ, Sun SD, Brandt M, et al. Processing window for laser metal deposition of Al 7075 powder with minimized defects. J Manuf Process, 2021, 64: 1484-1492.

[2.] Ansari M, Jabari E, Toyserkani E. Opportunities and challenges in additive manufacturing of functionally graded metallic materials via powder-fed laser directed energy deposition: a review. J Mater Process Tech, 2021, 294: 117117.

[3.] Tan C, Chew Y, Weng F, et al. Laser aided additive manufacturing of spatially heterostructured steels. Int J Mach Tool Manu, 2022, 172: 103817.

[4.] Poggi M, Atzeni E, Iuliano L, et al. State-of-the-art of numerical simulation of laser powder directed energy deposition process. Procedia CIRP, 2022, 112: 376-381.

[5.] Baraldo S, Roncoroni A, Palo F, et al. Multi-physics based methodology for evaluating powder feeding quality for laser metal deposition. Procedia CIRP, 2022, 107: 623-628.

[6.] Moritz J, Seidel A, Kopper M, et al. Hybrid manufacturing of titanium Ti-6Al-4V combining laser metal deposition and cryogenic milling. Int J Adv Manuf Tech, 2020, 107: 2995-3009.

[7.] Zhou H, Yang Y, Wang D, et al. Powder flow simulation of a ring-type coaxial nozzle and cladding experiment in laser metal deposition. Int J Adv Manuf Techn, 2022, 120(11/12): 8389-8400.

[8.] Zhang C, Chen F, Huang Z, et al. Additive manufacturing of functionally graded materials: a review. Mat Sci Eng A, 2019, 764: 138209.

[9.] Yan L, Chen Y, Liou F. Additive manufacturing of functionally graded metallic materials using laser metal deposition. Addit Manuf, 2020, 31: 100901.

[10.] Pasha A, Rajaprakash BM. Fabrication and mechanical properties of functionally graded materials: a review. Mater Today Proc, 2022, 52: 379-387.

[11.] Boggarapu V, Gujjala R, Ojha S, et al. State of the art in functionally graded materials. Compos Struct, 2021, 262: 113596.

[12.] Wang C, Zhang P, Zhang K, et al. A novel process parameter screening strategy by comprehensively consideration of powder separation, defects and power consumption when fabricating FGM using laser metal deposition. J Clean Prod, 2021, 278: 123274.

[13.] Su Y, Chen B, Tan C, et al. Influence of composition gradient variation on the microstructure and mechanical properties of 316 L/Inconel 718 functionally graded material fabricated by laser additive manufacturing. J Mater Process Tech, 2020, 283: 116702.

[14.] Ghanavati R, Naffakh-Moosavy H, Moradi M. Additive manufacturing of thin-walled SS316L-IN718 functionally graded materials by direct laser metal deposition. J Mater Res Technol, 2021, 15: 2673-2685.

[15.] Ramakrishnan A, Dinda GP. Functionally graded metal matrix composite of Haynes 282 and SiC fabricated by laser metal deposition. Mater Des, 2019, 179: 107877.

[16.] Yao J, Xin B, Gong Y, et al. Effect of initial temperature on the microstructure and properties of stellite-6/Inconel 718 functional gradient materials formed by laser metal deposition. Materials, 2021, 14(13): 3609.

[17.] Tan C, Weng F, Sui S, et al. Progress and perspectives in laser additive manufacturing of key aeroengine materials. Int J Mach Tool Manuf, 2021, 170: 103804.

[18.] Shah K, Haq I, Khan A, et al. Parametric study of development of Inconel-steel functionally graded materials by laser direct metal deposition. Mater Des, 2014, 54: 531-538.

[19.] Su YY, Wang ZF, Xie JC, et al. Microstructures and mechanical properties of laser melting deposited Ti6Al4V/316L functional gradient materials. Mat Sci Eng A, 2021, 817: 141355.

[20.] Bunkluarb N, Sawangtong W, Khajohnsaksumeth N, et al. Numerical simulation of granular mixing in static mixers with different geometries. Adv Differ Equ, 2019, 2019: 1-17.

[21.] Soman SS, Madhuranthakam CMR. Effects of internal geometry modifications on the dispersive and distributive mixing in static mixers. Chem Eng Process, 2017, 122: 31-43.

[22.] Thakur RK, Vial C, Nigam KDP, et al. Static mixers in the process industries—a review. Chem Eng Res Des, 2003, 81(7): 787-826.

[23.] Haddadi MM, HosseiniS H, Rashtchian D, et al. Comparative analysis of different static mixers performance by CFD technique: an innovative mixer. Chin J Chem Eng, 2020, 28(3): 672-684.

[24.] Lowry E, Yuan Y, Krishnamoorthy G. A new correlation for single-phase pressure loss through SMV static mixers at high Reynolds numbers. Chem Eng Process, 2022, 171: 108716.

[25.] Chen JP, Xie SC, Huang H. A novel method of utilizing static mixer to obtain mixing homogeneity of multi-species powders in laser metal deposition. Chin J Aeronaut, 2023, 36(1): 423-433.

[26.] Meng H, Han M, Yu Y, et al. Numerical evaluations on the characteristics of turbulent flow and heat transfer in the lightning static mixer. Int J Heat Mass Transf, 2020, 156: 119788.

[27.] Alekseev KA, Mukhametzyanova AG. Classification, function, and construction of modern static mixers. Chem Petrol Eng, 2020, 55: 934-942.

[28.] Gross R, Fontana E, Silva A, et al. Dispersion of odorants in natural gas distribution networks. Heat Mass Transf, 2018, 54: 2827-2834.

[29.] Valdés JP, Kahouadji L, Matar OK. Current advances in liquid-liquid mixing in static mixers: a review. Chem Eng Res Des, 2022, 177: 694-731.

Funding

Jiangsu Industry-university-research Institute Cooperation Project(BY2021078)