This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/26653 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.msea.2020.139928 in citations.
Combined κ-carbide precipitation and recovery enables ultra-high strength and ductility in light-weight steels
Combined κ-carbide precipitation and recovery enables ultra-high strength and ductility in light-weight steels
Light-weight high-manganese steels with high aluminum and carbon contents are known to possess high age-hardening potential due to the precipitation of nano-sized κ-carbides. Although in recrystallized material the precipitation of the κ-phase has been widely researched, the influence of pre-deforma...
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Personal Name(s): | Brasche, Frederike (Corresponding author) |
---|---|
Haase, Christian / Lipińska-Chwałek, Marta / Mayer, Joachim / Molodov, Dmitri A. | |
Contributing Institute: |
Materialwissenschaft u. Werkstofftechnik; ER-C-2 |
Published in: | Materials science and engineering / A, 795 (2020) S. 139928 - |
Imprint: |
Amsterdam
Elsevier
2020
|
DOI: |
10.1016/j.msea.2020.139928 |
Document Type: |
Journal Article |
Research Program: |
SFB 761: Stahl - ab initio. Quantenmechanisch geführtes Design neuer Eisenbasis-Werkstoffe Controlling Configuration-Based Phenomena |
Link: |
Published on 2020-07-23. Available in OpenAccess from 2022-07-23. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.msea.2020.139928 in citations.
Light-weight high-manganese steels with high aluminum and carbon contents are known to possess high age-hardening potential due to the precipitation of nano-sized κ-carbides. Although in recrystallized material the precipitation of the κ-phase has been widely researched, the influence of pre-deformation/deformation microstructure on the formation of κ-carbides is still unknown. The present study aims at gaining an increased understanding of the underlying mechanisms (and their interplay) active during annealing after pre-deformation, i.e. concurrent strengthening by precipitation of κ-carbides and softening by recovery/recrystallization. Therefore, a Fe-29.8Mn-7.65Al-1.11C steel was age-hardened in deformed/cold-rolled as well as in recrystallized condition. The microstructure and tensile behavior of the material in both states after annealing treatments at 600–800 °C were investigated by means of light optical microscopy, (high-resolution) scanning transmission electron microscopy, x-ray diffraction and hardness measurements as well as tensile tests. The focus was put on understanding the interplay between microstructural defects (e.g. dislocations), precipitation of κ-carbides, and recovery/recrystallization. The fundamental dependence of strengthening and softening mechanisms on the precondition, annealing parameters and correlation with the mechanical properties are discussed. |