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Impact of Defects in Powder Feedstock Materials on Microstructure of 304L and 316L Stainless Steel Produced by Additive Manufacturing

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Abstract

Recent work in both 304L and 316L stainless steel produced by additive manufacturing (AM) has shown that in addition to the unique, characteristic microstructures formed during the process, a fine dispersion of sub-micron particles, with a chemistry different from either the powder feedstock or the expected final material, are evident in the final microstructure. Such fine-scale features can only be resolved using transmission electron microscopy (TEM) or similar techniques. The present work uses electron microscopy to study both the initial powder feedstock and microstructures in final AM parts. Special attention is paid to the chemistry and origin of these nanoscale particles in several different metal alloys, and their impact on the final build. Comparisons to traditional, wrought material will be made.

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Acknowledgments

Los Alamos National Laboratory is operated by Los Alamos National Security, LLC; for the National Nuclear Security Administration of the U.S. Department of Energy under Contract DE-AC52-06NA25396. LA-UR-17-27531.

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Correspondence to Benjamin M. Morrow.

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Manuscript submitted August 22, 2017.

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Morrow, B.M., Lienert, T.J., Knapp, C.M. et al. Impact of Defects in Powder Feedstock Materials on Microstructure of 304L and 316L Stainless Steel Produced by Additive Manufacturing. Metall Mater Trans A 49, 3637–3650 (2018). https://doi.org/10.1007/s11661-018-4661-9

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  • DOI: https://doi.org/10.1007/s11661-018-4661-9

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