Formability analysis of micro-alloyed sheet metals reinforced by additive manufacturing
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Author / Producer
Date
2020
Publication Type
Conference Paper
ETH Bibliography
no
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Abstract
Additive manufacturing (AM) offers the possibility of locally reinforcing sheet metal or sheet metal products by adding patches that are metallurgically bonded to the substrate. Due to the high design freedom of AM, patches can be easily adapted to loads in geometry and thickness. However, the heat input and the high cooling rates during AM processes have a strong influence on the microstructure in the patch as well as in the substrate, which will affect forming properties. The aim of this work is to investigate the influence of patches produced by laser material deposition (LMD) on formability of micro-alloyed sheet metals. After determining a suitable process window for metallurgically bonded patches without cracks and pores, investigations were carried out on the microstructure and mechanical properties of reinforced samples. This work includes metallographic examinations using optical microscopy, hardness measurements and tensile tests. The formability of sheets with local reinforcement was investigated by stretching and Nakajima tests. The heat input creates a heat affected zone (HAZ) directly next to the patches with a reduced strength, caused by recrystallization that may lead to failure in the forming process and thus limits the forming capacity of locally reinforced sheet metals. A subsequent laser heat treatment can homogenize the properties in the HAZ.
Permanent link
Publication status
published
External links
Editor
Book title
23rd International Conference on Material Forming
Journal / series
Volume
47
Pages / Article No.
1023 - 1028
Publisher
Elsevier
Event
23rd International Conference on Material Forming (ESAFORM 2020) (virtual)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Additive manufacturing (AM); Hybride manufacturing; Forming; Local reinforcement; Forming limit cuurve (FLC)
Organisational unit
09706 - Bambach, Markus / Bambach, Markus
Notes
Due to the Coronavirus (COVID-19) the conference was conducted virtually.