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@PHDTHESIS{Schuler:854573,
author = {Schuler, Philipp Steffen},
othercontributors = {Krupp, Ulrich and Gümpel, Paul},
title = {{U}ntersuchung von ferromagnetischen {E}ffekten an
austenitischen rostfreien {S}tählen nach einer
{N}iedertemperatur-{K}arburierung},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2022-09636},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2023; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2022},
abstract = {The present work deals with different austenitic stainless
steels on which ferromagnetic effects were partially
detected after low-temperature carburizing. Due to the very
good corrosion resistance of austenitic steels, they are
used in a wide range of applications, from the chemical
industry to the watchmaking industry. Because of the
face-centered cubic lattice, these steels are very sensitive
to wear under tribological stress. Since conventional
hardening is not possible, due to the lack of
ferrite-austenite transformation, the only option here is
surface hardening by means of low-temperature carburizing,
for example. The hardened surface layer, produced in this
process, consists of an expanded austenitic lattice. The
expansion being caused by the interstitially embedded
carbon.In this work, nine different austenitic stainless
alloys were subjected to low-temperature carburization and
subsequently investigated. The focus was placed on the
investigations concerning ferromagnetism. No magnetizability
was observed in the low alloy austenitic steels after
treatment, while the higher alloyed steels exhibited very
significant magnetizability. Grain orientation-dependent
magnetic domain structures were detected in the
ferromagnetic layer regions. It was further demonstrated
that only purely part of the formed layer exhibited
ferromagnetic properties and that these were caused by
critical lattice expansion. The lattice parameter range in
which ferromagnetic properties predominate in the layer,
could be detected by different methods. By a supplementary
evaluation of the results by means of the alloy-dependent
stacking fault energy, a differentiated result evaluation
could be carried out. Furthermore, a minimum stacking fault
energy could be determined for the alloys investigated,
above which the alloys form ferromagnetism in the layer.
Also a different expression of lattice defects could be
recognized, depending on the alloy as well as the grain
orientation.From the results it is clear that the alloy
composition is decisive for the formation of ferromagnetism
in the layer. The occurring ferromagnetism is explained by
the lattice expansion, whereby the alloy-dependent plastic
deformation behavior, which can be described by the stacking
fault energy, also plays a superimposed role.},
cin = {522110 / 520000},
ddc = {620},
cid = {$I:(DE-82)522110_20180901$ / $I:(DE-82)520000_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2022-09636},
url = {https://publications.rwth-aachen.de/record/854573},
}
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