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Impact welding of ultra-high-strength stainless steel in wrought vs. additively manufactured forms

  • Bert C. LiuEmail author
  • Anthony Palazotto
  • Anupam Vivek
  • Glenn S. Daehn
ORIGINAL ARTICLE
  • 52 Downloads

Abstract

15-5 PH stainless steel (SS) possesses both high strength and good corrosion resistance and is often used in aerospace components. However, age-hardened 15-5 PH SS can lose up to 20% of its strength during fusion welding due to overaging brought on by heat effect. This work addresses the problem of strength reduction observed in 15-5 PH SS by employing the low-heat welding technique of impact welding. Both wrought (W) and additively manufactured (AM) versions of 15–5 PH SS were investigated through experimentation. All workpieces were age-hardened to condition H900 prior to welding. Best weld microstructures and peel strengths were obtained at impact angles of 12°, for both W and AM variants. Peak peel strength for W welds exceeded 178 N/mm, and for AM welds, 141 N/mm. Failure through base material, which was a most desirable failure mode, was obtained for both material types, though further work will be needed to obtain this failure mode repeatably. Thus, the capability of obtaining strong welds with age-hardened 15-5 PH SS was demonstrated. This capability can help eliminate the need for post-weld heat treatment, thus saving significant time and cost and opening up new design possibilities.

Keywords

Solid-state welding Ultra-high-strength steel Peel strength Weld microstructure High-strain-rate shear deformation 

Notes

Acknowledgments

Special thanks go to staff at Material Characterization Facility at Air Force Research Laboratory for help with microscopy, and AFIT Model Fabrication Shop for support with manufacturing and sectioning.

Funding information

The authors would like to acknowledge Air Force Office of Scientific Research for sponsoring this work. Dr. Anupam Vivek and Dr. Glenn Daehn acknowledge the support of the National Science Foundation under Grant Opportunities for Academic Liaison with Industry (GOALI), Award No. 1538736.

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Air Force Institute of TechnologyWright Patterson Air Force BaseDaytonUSA
  2. 2.The Ohio State UniversityColumbusUSA

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