Abstract
Laser Cladding is an additive manufacturing technology enabling to repair complex metallic components by removing the worn region and reconstructing locally the initial geometry. The aim of this work is to study the mechanical response of Inconel 718 repaired thin walls. More precisely, we perform an EBSD imaging and in-situ SEM tensile tests on specimen whose gauge section contains the interface between base material and repaired area. We observe the multiaxial strain patterns until failure at the grain level using a Digital Image Correlation method and superpose this pattern with the microstructure gradient induced by repair. The observations highlight a strain localization phenomenon in repaired structures mainly due to grain size effect.
Highlights
Repairing massive metallic components has become a major asset for industries [27] as a consequence of the high cost of technological alloys and of components manufacturing
Laser Cladding, denoted as Direct Energy Deposition or Laser Metal Deposition, is an additive manufacturing process that involves a nozzle consisting of a coaxial laser beam and metallic powder jet
The microstructure obtained with Laser Cladding is really specific and different from those created with more conventional processes like forge or foundry
Summary
Repairing massive metallic components has become a major asset for industries [27] as a consequence of the high cost of technological alloys and of components manufacturing. Laser Cladding is a highly promising technology, by virtue of a small Heat Affected Zone (HAZ), when compared with other repair processes such as Tungsten Inert Gas or Gas Metal Arc Welding [5, 10]. The material experiences a first solidification with the displacement of the melt pool together with the laser but it can be remelted when the above layer is built. It is annealed as the part stays at high temperatures until the end of the process [17, 28] what can lead to metallurgical transformations
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