TY  - JOUR
AU  - Brasche, Frederike
AU  - Haase, Christian
AU  - Lipińska-Chwałek, Marta
AU  - Mayer, Joachim
AU  - Molodov, Dmitri A.
TI  - Combined κ-carbide precipitation and recovery enables ultra-high strength and ductility in light-weight steels
JO  - Materials science and engineering / A
VL  - 795
SN  - 0921-5093
CY  - Amsterdam
PB  - Elsevier
M1  - FZJ-2020-05191
SP  - 139928 -
PY  - 2020
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000576173800001
DO  - DOI:10.1016/j.msea.2020.139928
UR  - https://juser.fz-juelich.de/record/888762
ER  -