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Reversed Austenite for Enhancing Ductility of Martensitic Stainless Steel

  • Sebastian Dieck
  • Martin Ecke
  • Paul Rosemann
  • Thorsten Halle
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Quenching and partitioning (Q&P) heat treatment increases the deformability of high-strength martensitic steels. Therefore, it is necessary to have some metastable austenite in the microstructure, which transforms in martensite during plastic deformation (TRIP effect). The austenitic-martensitic microstructure is gained by an increased austenitization temperature, water quenching and additional partitioning. The partitioning enables local carbon diffusion, which stabilizes retained austenite and leads to partial reversion of martensite to austenite. The influence of partitioning time was studied for the martensitic stainless steel AISI 420 (X46Cr13, 1.4034). In line with these efforts, metallographic, XRD and EBSD measurements were performed to characterize the microstructural evolution. The mechanical properties were tested using tension and compression loading. Additional corrosion investigations showed the benefits of Q&P heat treatment compared to conventional tempering. The reversion of austenite by the partitioning treatment was verified with EBSD and XRD. Furthermore, the results of the mechanical and corrosion testing showed improved properties due to the Q&P heat treatment.

Keywords

Reversed austenite Quenching and partitioning Stainless steel Corrosion resistance 

Notes

Acknowledgements

The authors would like to acknowledge financial support by the GKMM 1554. Further thanks to the Federal Institute of Materials Science and Testing (BAM) for corrosion testing. The authors are grateful to Mr. Sebastian Fritsch (Technical University Chemnitz) for performing the compression testing.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Sebastian Dieck
    • 1
  • Martin Ecke
    • 1
  • Paul Rosemann
    • 1
    • 2
  • Thorsten Halle
    • 1
  1. 1.Otto-von-Guericke-University Magdeburg, Institute of Materials and Joining TechnologyMagdeburgGermany
  2. 2.Department 7.6 Corrosion and Corrosion ProtectionBAM Federal Institute for Materials Research and TestingBerlinGermany

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