Journal Article

FZJ-2020-05191

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Combined κ-carbide precipitation and recovery enables ultra-high strength and ductility in light-weight steels

Brasche, F. (Corresponding author) ; Haase, C. ; Lipińska-Chwałek, M.FZJ*RWTH* ; Mayer, J.FZJ* ; Molodov, D. A.

2020
Elsevier Amsterdam

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/26653  doi:10.1016/j.msea.2020.139928

Abstract: 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.

---

Contributing Institute(s):

1. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 143 - Controlling Configuration-Based Phenomena (POF3-143) (POF3-143)
2. DFG project 29898171 - SFB 761: Stahl - ab initio. Quantenmechanisch geführtes Design neuer Eisenbasis-Werkstoffe (29898171) (29898171)

Appears in the scientific report 2020

---

Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---