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

  • Eric A. LassEmail author
  • Mark R. Stoudt
  • Maureen E. Williams
Communication
  • 40 Downloads

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.

Notes

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

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Copyright information

© This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2019

Authors and Affiliations

  • Eric A. Lass
    • 1
    Email author
  • Mark R. Stoudt
    • 1
  • Maureen E. Williams
    • 1
  1. 1.Materials Science and Engineering Division, Material Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgUSA

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