Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2020
Thesis Language: Turkish
Student: HİLAL AKILLILAR
Supervisor: GÖKHAN KÜÇÜKTÜRK
Abstract:Additive manufacturing has become one of the leading methods in the production of functional parts with complex geometries. It provides a number of advantages by minimizing the production cost, the amount of material used, the production time or the cost of the tool used. It is generally based on the principle of slicing geometric design data in layers and melting the layers by overlapping until the desired final shape is formed. There are different types of methods depending on the type of material used, energy source, and how the material is built. Electron Beam Melting (EBM) method is one of the powder bed layered manufacturing methods. Parts with high melting temperatures or reactive materials are produced by the non-contact melting method in a vacuum environment. The production parameters used during the method have significant effects on the final product to be obtained. Determining the optimum range for parameters such as beam power, scanning speed, layer thickness, beam diameter is of great importance in terms of increasing the quality of the part to be built. In the study, the EBM method is modelled and it is aimed to analyse the interaction between Ti-6Al-4V powder layer and energy source via simulation. The effects of the determined scanning speed, electron beam power on the melt pool were examined, and parameter range selection was achieved based on the changes in the powder layer. It has been observed that the melt pool depth decreased from 53.1 μm to 7.91 μm by increasing the scanning speed with keeping the beam power constant at 1750 W and decreasing the interaction time between the beam and the powder layer. The increasing the electron beam power, so higher energy density, applied to the powder layer at the fixed value of 2.4 m / s of the beam velocity the melt pool depth increased from 17.9 μm to 53.1 μm. It is also determined by simulations that the selected parameters greatly affect the highest temperature occurring in the melt pool. In addition to these results, the most suitable parameter combinations for the temperature values between the melting and evaporation points were determined with the graphics obtained.