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International Journal of Fracture

, Volume 215, Issue 1–2, pp 139–151 | Cite as

Fracture toughness of high-alloy austenitic-martensitic TRIP steels after Q&P processing

  • R. EcknerEmail author
  • L. Krüger
  • C. Ullrich
  • M. Wendler
  • O. Volkova
Brief Note
  • 115 Downloads

Abstract

The recently developed austenitic-martensitic TRIP cast steel Fe–14Cr–3Ni–3Mn–0.4Si–0.11N–0.15C was subjected to different Quenching & Partitioning (Q&P) treatments in order to achieve a variation of the microstructural and mechanical properties. Subsequently, the fracture properties of three material variants were studied by means of tensile tests and fracture mechanical 3-point-bending tests to determine J\(\Delta a\) fracture resistance curves. Due to Q&P treatment, the steel achieved considerable strength and ductility values (UTS of about 1500 MPa with a total elongation of almost 30%) which qualify it for the 3rd generation of AHSS. The fracture toughness behavior was significantly influenced by the initial \(\upalpha ^\prime \)-martensite content as well as by the austenite stability, which could be adjusted by varying the Q&P parameters. If the austenite stability was low, the formation of deformation-induced \(\upalpha ^\prime \)-martensite became possible. This TRIP effect is known to be beneficial for fracture toughness of austenitic steels. However, the experimental results suggest that there was a contrary effect of embrittlement due to metastable austenite which undergoes martensitic transformation already in the early stages of deformation. Therefore, the Q&P parameters have to be carefully chosen in order to achieve a remarkable combination of strength, ductility and fracture toughness of the investigated high-alloy austenitic-martensitic TRIP steel.

Keywords

Q&P steel TRIP-aided steel Toughness Fracture Martensite transformation 

Notes

Acknowledgements

This work was supported by the German Research Foundation or Deutsche Forschungsgemeinschaft (DFG), and was created as part of the Collaborative Research Center TRIP-Matrix-Composites (SFB 799), subproject B2. Furthermore, we would like to thank Mr. R. Prang for his excellent sample preparation preceding the microstructural investigations and Mr. S. Henschel and Mrs. E.-M. Kandler for their help in the fracture surface investigations.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • R. Eckner
    • 1
    Email author
  • L. Krüger
    • 1
  • C. Ullrich
    • 2
  • M. Wendler
    • 3
  • O. Volkova
    • 3
  1. 1.Technische Universität Bergakademie Freiberg, Institute of Materials EngineeringFreibergGermany
  2. 2.Technische Universität Bergakademie Freiberg, Institute of Materials ScienceFreibergGermany
  3. 3.Technische Universität Bergakademie Freiberg, Institute of Iron and Steel TechnologyFreibergGermany

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