JOM

, Volume 68, Issue 3, pp 930–942 | Cite as

Additive Manufacturing of 17-4 PH Stainless Steel: Post-processing Heat Treatment to Achieve Uniform Reproducible Microstructure

  • Sudha Cheruvathur
  • Eric A. Lass
  • Carelyn E. Campbell
Article

Abstract

17-4 precipitation hardenable (PH) stainless steel is a useful material when a combination of high strength and good corrosion resistance up to about 315°C is required. In the wrought form, this steel has a fully martensitic structure that can be strengthened by precipitation of fine Cu-rich face-centered cubic phase upon aging. When fabricated via additive manufacturing (AM), specifically laser powder-bed fusion, 17-4 PH steel exhibits a dendritic structure containing a substantial fraction of nearly 50% of retained austenite along with body centered cubic/martensite and fine niobium carbides preferentially aligned along interdendritic boundaries. The effect of post-build thermal processing on the material microstructure is studied in comparison to that of conventionally produced wrought 17-4 PH with the intention of creating a more uniform, fully martensitic microstructure. The recommended stress relief heat treatment currently employed in industry for post-processing of AM 17-4 PH steel is found to have little effect on the as-built dendritic microstructure. It is found that, by implementing the recommended homogenization heat treatment regimen of Aerospace Materials Specification 5355 for CB7Cu-1, a casting alloy analog to 17-4 PH, the dendritic solidification structure is eliminated, resulting in a microstructure containing about 90% martensite with 10% retained austenite.

Notes

Acknowledgement

The authors would like to thank the NIST Engineering Laboratory for building the additively manufactured 17-4 steel used in this study.

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Copyright information

© The Minerals, Metals & Materials Society (outside the U.S.) 2015

Authors and Affiliations

  • Sudha Cheruvathur
    • 1
  • Eric A. Lass
    • 1
  • Carelyn E. Campbell
    • 1
  1. 1.Materials Science and Engineering Division, Materials Measurement LaboratoryNational Institute of Standards and TechnologyGaithersburgUSA

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