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@ARTICLE{Yao:838299,
author = {Yao, M. J. and Welsch, E. and Ponge, D. and Haghighat, S.
M. H. and Sandlöbes, S. and Choi, P. and Herbig, M. and
Bleskov, I. and Hickel, T. and Lipinska-Chwalek, M. and
Shanthraj, P. and Scheu, C. and Zaefferer, S. and Gault, B.
and Raabe, D.},
title = {{S}trengthening and strain hardening mechanisms in a
precipitation-hardened high-{M}n lightweight steel},
journal = {Acta materialia},
volume = {140},
issn = {1359-6454},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2017-06942},
pages = {258 - 273},
year = {2017},
abstract = {We report on the strengthening and strain hardening
mechanisms in an aged high-Mn lightweight steel
(Fe-30.4Mn-8Al-1.2C, $wt.\%)$ studied by electron channeling
contrast imaging (ECCI), transmission electron microscopy
(TEM), atom probe tomography (APT) and correlative TEM/APT.
Upon isothermal annealing at 600 °C, nano-sized κ-carbides
form, as characterized by TEM and APT. The resultant alloy
exhibits high strength and excellent ductility accompanied
by a high constant strain hardening rate.In comparison to
the as-quenched κ-free state, the precipitation of
κ-carbides leads to a significant increase in yield
strength (∼480 MPa) without sacrificing much tensile
elongation. To study the strengthening and strain hardening
behavior of the precipitation-hardened material, deformation
microstructures were analyzed at different strain levels.
TEM and correlative TEM/APT results show that the
κ-carbides are primarily sheared by lattice dislocations,
gliding on the typical face-centered-cubic (fcc) slip system
{111}<110>, leading to particle dissolution and solute
segregation. Ordering strengthening is the predominant
strengthening mechanism. As the deformation substructure is
characterized by planar slip bands, we quantitatively
studied the evolution of the slip band spacing during
straining to understand the strain hardening behavior. A
good agreement between the calculated flow stresses and the
experimental data suggests that dynamic slip band refinement
is the main strain hardening mechanism. The influence of
κ-carbides on mechanical properties is discussed by
comparing the results with that of the same alloy in the
as-quenched, κ-free state.},
cin = {ER-C-2},
ddc = {670},
cid = {I:(DE-Juel1)ER-C-2-20170209},
pnm = {143 - Controlling Configuration-Based Phenomena (POF3-143)},
pid = {G:(DE-HGF)POF3-143},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000413879800027},
doi = {10.1016/j.actamat.2017.08.049},
url = {https://juser.fz-juelich.de/record/838299},
}