Assises Européennes de la Fabrication Additive
27 to 29 June 2017 | CentraleSupélec Chatenay-Malabry
IREPA LASER is taking part in the Assises Européennes de la Fabrication Additive. This annual event organised by the Association Française du Prototypage Rapide (AFPR) is a must for the international additive manufacturing community.
On this occasion, Didier BOISSELIER, additive manufacturing expert at IREPA LASER, will give a presentation on the effect of build strategies on a large part manufactured by the CLAD® process. This talk is scheduled for 29 June at 12.30pm.
Also on the programme: a talk on the manufacture of parts with material gradients using a Ti6Al4V-Mo alloy by the CLAD® process, presented by Catherine SCHNEIDER-MAUNOURY, PhD student in additive manufacturing at IREPA LASER. This talk is scheduled for 28 June at 3.55pm.
During the event, meet our experts on the IREPA LASER stand.
Information and registration: HERE
Conference abstracts
Didier BOISSELIER, Philippe ACQUIER, Jérôme WURSTHORN – IREPA LASER
Ana Maria FERNANDEZ BLANCO, Ludger WEBER and Andreas MORTENSEN– EPFL Lausanne
Effect of build strategies on a large part manufactured by the CLAD® process
Material (powder) deposition processes using concentrated energy (laser) are used to manufacture medium to large parts in a wide range of materials. As part size increases, distortion and process robustness during long manufacturing cycles play a major role. Operating conditions and build strategies must be optimised to achieve the expected part quality.
Based on the additive manufacturing process known as CLAD®, and as part of the EU-funded AMAZE FP7 project, a large demonstrator (> 1 m) was manufactured.
This paper will present the various stages involved in manufacturing this part: validation of material parameters, NDT, mechanical characterisation, construction of sub-elements and final manufacture of demonstrators. It will also highlight the problems encountered during manufacture and the solutions implemented to resolve them.
Catherine SCHNEIDER-MAUNOURY, Laurent WEISS, Pascal LAHEURTE, Didier BOISSELIER – IREPA LASER
Manufacture of parts with material gradients using a Ti6Al4V-Mo alloy by the CLAD® process
The aim of the work presented is to manufacture functionally graded materials (FGM: Functionaly Graded Material) using a powder deposition process called CLAD® (Construction Laser Additive Direct). FGMs are materials whose chemical composition, and therefore whose mechanical and microstructural properties, vary gradually in one or more directions. The benefit of such materials is the ability to combine and concentrate the advantages of two (or more) materials within a single part.
FGMs are produced using two powder feeders, each containing a different material. After defining the chemical composition of each element, the powders are mixed and then injected under the laser beam. The chemical composition can be adjusted layer by layer to create a composition gradient. Using two feeders makes it possible to produce unique, tailor-made alloys. One of the aims of this study is to adapt the process to combine materials with different thermophysical properties, such as melting temperature (1674°C for Ti6Al4V and 2617°C for Mo). The process parameters must also be adapted to melt both materials under the laser beam.
Various walls with composition gradients were produced, ranging from the simplest gradient to a more complex one. The chemical composition changes from 100% Ti6Al4V at the start of the build to 100% Mo at the top of the wall. Between the first and last layers, the percentage of Ti6Al4V and Mo increases or decreases by 50%, 25% or 20% between each gradient step.
The walls produced were characterised using various methods in order to determine, for each composition gradient: the phases present (XRD), the content of each chemical element (EDS), grain morphology and crystallographic texture (EBSD), mechanical properties (micro-hardness) and the distribution of the elements (tomography).
