| Abstract Scope |
When designing new alloys specifically for AM, the availability of powder with tailored composition is an obstacle with regard to both time and cost. This talk presents an overview of several approaches to overcome this obstacle. First, we bypass powder atomization completely, instead judging processability by laser re-melting. This approach is used for an initial screening step and allows the identification of compositions prone to e.g. hot cracking. Next, we produce alloys by mixing pure element powders in-situ. Using several powder feeders in the DED process, we produce graded specimens that allow screening of various alloy compositions in one specimen. We also process powder mixtures in the L-PBF process, and show how the process needs to be controlled in order to achieve chemical homogeneity and where the limitations of the powder mixing approach lie. Finally, we report on our attempts to produce powders in a self-designed EIGA-type lab-scale atomizer. |