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@PHDTHESIS{Mller:1004877,
author = {Müller, Bernd Josef},
othercontributors = {Schleifenbaum, Johannes Henrich and Gebhardt, Andreas},
title = {{M}inimalinvasives {L}aserauftragschweißen und
{F}unktionalisieren der {N}ickelbasis-{S}uperlegierung
{A}lloy 718; 1. {A}uflage},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {Apprimus Verlag},
reportid = {RWTH-2025-01681},
isbn = {978-3-98555-265-8},
series = {Ergebnisse aus der additiven Fertigung},
pages = {1 Online-Ressource : Illustrationen},
year = {2025},
note = {Druckausgabe: 2025. - Auch veröffentlicht auf dem
Publikationsserver der RWTH Aachen University. - Weitere
Reihe: Edition Wissenschaft Apprimus; Dissertation, RWTH
Aachen University, 2025},
abstract = {Despite high quality requirements for the complex
manufacturing processes in mechanical engineering, tool
making, or aeroengine technology, manufacturing deviations
in the production of new parts cannot be avoided. Likewise,
the often high-priced components are subject to wear and
tear over the course of their life cycle, which means that
they can no longer be used as intended. This has a negative
impact on the life cycle costs of the affected products, as
in addition to the high costs of the components themselves,
follow-up costs due to new procurement, loss of production
and contractually agreed availability must be considered.
Due to long product life cycles, components and spare parts
must be available on the market decades after they have been
put into service. The resulting need for repair procedures
for every phase of the product life cycle represents a
challenge for manufacturing and service companies. One
possible method to address manufacturing deviations and wear
is laser deposition welding (directed energy deposition with
a laser beam on metallic materials, DEDLB/M). So far,
DED-LB/M has been used as a repair process only for areas of
components that are accessible with the available system
technology, and where the material properties are not
significantly deteriorated by the DED-LB/M process, thereby
ensuring the component’s functionality. Manufacturing
deviations and wear often occur in areas of components that
are inaccessible with the available DED-LB/M system
technology, requiring access to be created for repair. This
approach can be compared to the surgical techniques prior to
the introduction of minimally invasive surgery, which led to
the widespread use of endoscopes and the miniaturization of
surgical instruments. Therefore, the aim of this work is to
investigate how a minimally invasive application of
crack-free coatings within Alloy 718 components, with access
openings (height ≤ 50 mm, width ≤ 10 mm), and the
minimally invasive, laser-based functionalization for
precipitation hardening of the coated area can be achieved
using the required system technology for industrial
applications. This procedural combination offers untapped
potential for the repair of components in the tool, machine,
and engine building industries. The necessary system
technology is designed, assembled, and tested. Additionally,
a process development is carried out. The static mechanical
properties of the applied and functionalized material are
determined through tensile tests, and the resulting
microstructure is metallographically analyzed. As part of an
application demonstration, a minimally invasive
reconstruction within a cavity of a structural engine
component is realized, followed by the functionalization of
the applied material.},
cin = {421510},
ddc = {620},
cid = {$I:(DE-82)421510_20170406$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2025-01681},
url = {https://publications.rwth-aachen.de/record/1004877},
}
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