Master Thesis Online
Development and characterization of a gradient structured material elaborated by direct deposition additive manufacturing
Corongiu, Chiara 
Promotor(s) :
Mertens, Anne
Date of defense : 25-Jun-2020/26-Jun-2020 • Permalink : http://hdl.handle.net/2268.2/8786
TFE_Corongiu_Chiara.pdfDetails
| Title : | Development and characterization of a gradient structured material elaborated by direct deposition additive manufacturing |
| Translated title : | [fr] Développement et caractérisation d'un matériau à gradient de composition élaboré par fabrication additive par dépôt direct |
| Author : | Corongiu, Chiara
|
| Date of defense : | 25-Jun-2020/26-Jun-2020 |
| Advisor(s) : | Mertens, Anne
|
| Committee's member(s) : | Marchal, Yves
Ponthot, Jean-Philippe
Maurizi Enrici, Tommaso
|
| Language : | English |
| Number of pages : | 77 |
| Keywords : | [fr] Additive manufacturing, metallic materials, cladding, martensite, ferrite, hardness |
| Discipline(s) : | Ingénierie, informatique & technologie > Science des matériaux & ingénierie |
| Research unit : | Laboratoire MMS Uliege |
| Target public : | Researchers Professionals of domain Student |
| Institution(s) : | Université de Liège, Liège, Belgique |
| Degree: | Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering" |
| Faculty: | Master thesis of the Faculté des Sciences appliquées |
Abstract
[en] In this master thesis, a gradient composition material was developed and characterized using direct energy deposition additive manufacturing. The goal was to enhance the mechanical properties of a pinion located in the deployment mechanism of slats produced by Sonaca.
The materials selection resulted in choosing martensitic and ferritic steels.
Powders from Pometon and Sandvik were characterized by means of an optical microscope, differential thermal analysis, scanning electron microscope, gas pycnometer and granulometry. Pometon powders were found to contain chromium oxides while Sandvik powders showed good features.
Deposits were printed with different laser parameters. The ferritic zones of the sample exhibited in-situ oxides that were avoided by increasing the incident energy. The martensitic zones presented no porosities nor cracks. The gradient structure showed up to have no added value due to a lack of corrosion resistance as well as a hardness similar to the martensitic zone. Due to the COVID-19 outbreak, characterization of deposits was not completed.
The reference part was characterized and its properties were compared to those of the deposits. The reference part had a better surface hardness but a significantly lower corrosion resistance. Additional characterization means are required to draw conclusions on the interest of deposits compared to the currently used material and surface treatments.
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