%0 Journal Article
%A Brasche, Frederike
%A Haase, Christian
%A Lipińska-Chwałek, Marta
%A Mayer, Joachim
%A Molodov, Dmitri A.
%T Combined κ-carbide precipitation and recovery enables ultra-high strength and ductility in light-weight steels
%J Materials science and engineering / A
%V 795
%@ 0921-5093
%C Amsterdam
%I Elsevier
%M FZJ-2020-05191
%P 139928 -
%D 2020
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000576173800001
%R 10.1016/j.msea.2020.139928
%U https://juser.fz-juelich.de/record/888762