Abstract
Oxide inclusions in stainless steel act as initiation sites for microvoids which result in significant effects on mechanical properties. In the case of additive manufacturing (AM) 316L stainless steel, oxide inclusions can nucleate during laser melting and remain in the solidified microstructure. This work is aimed at assessing whether extraneous oxygen in process environment contributes to inclusion formation. The stainless-steel alloy 316L was employed and fabricated under series of different oxygen content environments. The characterization of oxide inclusions in AM processed materiel were conducted using scanning electron microscopy (SEM) and they are found enriched in oxygen getters such as Si and Mn. Inert gas fusion (IGF) was used to measure oxygen content before and after AM processing. Results indicated that extraneous oxygen from the process environment played a role in oxide inclusion formation. Furthermore, the average inclusion size was found to increase with increasing oxygen content in process environment, suggesting a coarsening mechanism of oxides due to the interactions between them in the melt pool.
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References
DebRoy, T., et al.: Additive manufacturing of metallic components – process, structure and properties. Prog. Mater. Sci. 92, 112–224 (2018)
Irukuvarghula, S., et al.: Effect of powder characteristics and oxygen content on modifications to the microstructural topology during hot isostatic pressing of an austenitic steel. Acta Mater. 172, 6–17 (2019)
Kitchenr, J.A., Bockris, J.O.M., Gleiser, M., Evans, J.W.: Note on the solubility of oxygen in gamma iron. Trans. Faraday Soc. 48, 995–997 (1952)
Meijering, J.L.: On the diffusion of oxygen through solid iron. Acta Metall. 3, 157–162 (1955)
Yan, F., et al.: Characterization of nano-scale oxides in austenitic stainless steel processed by powder bed fusion. Scr. Mater. 155, 104–108 (2018)
Park, J.H., Kang, Y.: Inclusions in stainless steels − a review. Steel Res. Int. 88(12) (2017)
Hebsur, M.G., Moore, J.J.: Influence of inclusions and heat treated microstructure on hydrogen assisted fracture properties of AISI 316 stainless steel. Eng. Fract. Mech. 22, 93–100 (1985)
Chao, J., Capdevila, C.: Anisotropy in mechanical properties and fracture behavior of an oxide dispersion Fe20Cr5Al alloy. Metall. Mater. Trans. A. 45(9), 3767–3780 (2014)
Oksiuta, Z., et al.: Development and characterisation of a new ODS ferritic steel for fusion reactor application. J. Nucl. Mater. 393(1), 114–119 (2009)
Lou, X., Andresen, P.L., Rebak, R.B.: Oxide inclusions in laser additive manufactured stainless steel and their effects on impact toughness and stress corrosion cracking behavior. J. Nucl. Mater. 499, 182–190 (2018)
Cooper, A.J., et al.: Effect of oxygen content upon the microstructural and mechanical properties of type 316L austenitic stainless steel manufactured by hot Isostatic pressing. Metall. Mater. Trans. A. 47(9), 4467–4475 (2016)
Cooper, A.J.: Mechanistic studies on type 300 stainless steels manufactured by hot isostatic pressing: the impact of oxygen involvement on fracture behaviour. Am. Soc. Mech. Eng. (2016)
Heiden, M.J., et al.: Evolution of 316L stainless steel feedstock due to laser powder bed fusion process. Addit. Manuf. 25, 84–103 (2019)
Slotwinski, J.A., et al.: Characterization of metal powders used for additive manufacturing. J. Res. Natl. Inst. Stand. Technol. 119, 460–493 (2014)
Tan, J.H., Wong, W.L.E., Dalgarno, K.W.: An overview of powder granulometry on feedstock and part performance in the selective laser melting process. Addit. Manuf. 18, 228–255 (2017)
Radjai, F., et al.: Combined effect of moisture and electrostatic charges on powder flow. EPJ Web Conf. 140 (2017)
Olakanmi, E.O.: Effect of mixing time on the bed density, and microstructure of selective laser sintered (SLS) aluminium powders. Mater. Res. 15(2), 167–176 (2012)
Eo, D.-R., Park, S.-H., Cho, J.-W.: Inclusion evolution in additive manufactured 316L stainless steel by laser metal deposition process. Mater. Des. 155, 212–219 (2018)
Song, M., et al.: Effect of environmental oxygen content on the oxide inclusion in laser solid formed AISI 420 stainless steel. Mater. Des. 90, 459–467 (2016)
E1019-18: Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt Alloys by Various Combustion and Fusion Techniques. ASTM International, West Conshohocken (2018)
E1245-03: Standard Practice for Determining the Inclusion or Second-phase Constituent Content of Metals by Automatic Image Analysis. ASTM International, West Conshohocken (2003)
Sgobba, S., Daniellou, T.: Effects of thermocapillary forces during welding of 316L-type wrought, cast and powder metallurgy austenitic stainless steels. J. Mater. Process. Technol. 143-144, 578–583 (2003)
Ahmadi, E., Ebrahimi, A.R.: Welding of 316L austenitic stainless steel with activated tungsten inert gas process. J. Mater. Eng. Perform. 24(2), 1065–1071 (2014)
Suzuki, M., Yamaguchi, R., Murakami, K., Nakada, M.: Inclusion particle growth during solidification of stainless steel. ISIJ Int. 41(3), 247–256 (2001)
Yin, X., et al.: Inclusion evolution during refining and continuous casting of 316L stainless steel. Ironmak Steelmak. 43(7), 533–540 (2016)
Hojo, M.: Oxide inclusion control in Ladle and Tundish for producing clean stainless steel. ISIJ Int. 36, S128–S131 (1996)
Tseng, K.-H., Chen, P.-Y.: Effect of TiO2 crystalline phase on performance of flux assisted GTA welds. Mater. Manuf. Process. 31(3), 359–365 (2015)
Qiu, C., Panwisawas, C., Ward, M., Basoalto, H.C., Brooks, J.W., Attallah, M.M.: On the role of melt flow into the surface structure and porosity development during selective laser melting. Acta Materialia 96, 72–79 (2015).
Acknowledgements
This work was sponsored by US Department of Energy (contract DE-NE0008428) and National Institute of Standards and Technology (contract NIST-70NANB18H220). The authors gratefully acknowledge the material characterization supports from Mr. Orrie Riccobono at GE Research, Mr. Steve Moore at Auburn University’s Materials Research and Education Center and Dr. Vijay Rangari at Tuskegee University.
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Deng, P., Karadge, M., Rebak, R.B., Gupta, V.K., Prorok, B.C., Lou, X. (2021). The Role of Extraneous Oxygen in the Formation of Oxide Inclusions in 316L Stainless Steel Manufactured by Laser Powder Bed Fusion. In: Kramer, S.L., Tighe, R. (eds) Thermomechanics & Infrared Imaging, Inverse Problem Methodologies and Mechanics of Additive & Advanced Manufactured Materials, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-59864-8_12
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DOI: https://doi.org/10.1007/978-3-030-59864-8_12
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