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%0 Thesis
%A Oster, Lukas Emmanuel
%T Herstellung von LTT-Legierungen durch in situ Legieren mit Lichtbogenschweißen zur Beeinflussung von Eigenspannungen und Verzug
%V 2023,3
%I RWTH Aachen University
%V Dissertation
%C Aachen
%M RWTH-2024-00927
%@ 978-3-8440-9310-0
%B Aachener Berichte Fügetechnik
%P 1 Online-Ressource : Illustrationen
%D 2023
%Z Druckausgabe: 2023. - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University 2024
%Z Dissertation, RWTH Aachen University, 2023
%X Residual stresses and distortion are one of the main disturbance variables in the additive manufacturing of metallic components, as they can lead to deviations in shape on the one hand, but also deteriorate the structural behavior on the other. Their control represents a fundamental challenge and is the subject of numerous research projects. LTT alloys are used in the field of joint welding to influence the residual stress state of the welded structure while keeping distortion low. Their use in additive manufacturing is currently poorly explored, not least because their efficient local use in the printing process is currently technically unresolved. In this work, the possibility of making LTT alloys usable for additive manufacturing with the arc at low cost by in-situ alloying is investigated. To begin with, a suitable combination of welding consumables is selected for this purpose, and a usable parameter space is determined. By varying the cold wire feed rate of a Gas Metal Arc welding process, extended with a cold wire feeder, the alloy composition is determined which can be expected to produce the strongest possible LTT effect. The LTT effect is first evaluated in single-pass welds by deformation measurements of the substrate plate, as well as by downstream residual stress measurements. This is followed by an examination of the cyclic heat effect by carrying out surface buildup welds. The results of the work indicate that in-situ alloying is a promising tool to produce LTT alloys locally in the component. In both single-layer welds and the simulated multilayer case, LTT injection reduced substrate plate deformation. The use of multi-wire technology is emerging here as a cost-effective and efficient solution to additively produce multi-material components with an adapted residual stress state.
%F PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
%9 Dissertation / PhD ThesisBook
%R 10.18154/RWTH-2024-00927
%U https://publications.rwth-aachen.de/record/977825