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Additively Manufactured Nitrogen-Atomized 17-4 PH Stainless Steel with Mechanical Properties Comparable to Wrought

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Abstract

The microstructure of additively manufactured (AM) nitrogen-atomized 17-4 contains 12 ± 4 pct retained austenite after conventional solutionization annealing at 1323 K (1050 °C) resulting in a yield strength of about half that of wrought, which contains ≈ 100 pct BCC/martensite. An AM17-4 microstructure containing a volume fraction of ≈ 95 pct martensite is achieved by solutionizing at 1273 K (1000 °C) instead of 1323 K (1050 °C), where more nitrogen is trapped as M(C,N)-carbides, followed by further cooling to 233 K (− 40 °C). This alternative solutionization recovers the yield strength of the AM material to > 90 pct of its wrought counterpart, a critical first step toward the implementation of AM17-4 in real-world applications.

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The authors would like to thank the Engineering Laboratory at NIST for providing the as-built AM 17-4 samples.

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Authors and Affiliations

  1. Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA

    Eric A. Lass, Mark R. Stoudt & Maureen E. Williams

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  1. Eric A. Lass
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  2. Mark R. Stoudt
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  3. Maureen E. Williams
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Correspondence to Eric A. Lass.

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Manuscript submitted November 21, 2018.

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Lass, E.A., Stoudt, M.R. & Williams, M.E. Additively Manufactured Nitrogen-Atomized 17-4 PH Stainless Steel with Mechanical Properties Comparable to Wrought. Metall Mater Trans A 50, 1619–1624 (2019). https://doi.org/10.1007/s11661-019-05124-0

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