| Abstract [eng] |
Direct Metal Laser Sintering (DMLS) technology enables the fabrication of metal components with complex geometry; however, its application is limited by defect formation in alloys and challenges in microstructural control, particularly when forming bimetallic structures. This dissertation investigates the experimental optimisation of the DMLS process to improve alloy quality and to form bimetallic structures composed of 17-4 PH stainless steel and Fe29Ni17Co alloy. The influence of powder morphology, chemical composition, and particle size fraction on surface roughness was analysed, and the effect of volumetric energy density on defect formation and mechanical properties was determined. For the first time, a bimetallic structure with a continuous transition zone between the two materials was fabricated using the DMLS method. Experimental investigations and numerical modelling demonstrated that adjusting the ratio of material layers enables control over thermal expansion and geometrical deformation. The results of this dissertation are relevant for the development of multifunctional, thermally responsive components in advanced metal additive manufacturing. |
