Comparison Of Different Alloying Concepts For Mo For Improving Component Strength And Quality In LPBF

• DOI: 10.59499/ep235764236
• Publication Date: 2023-10-17T13:37:21Z
• Authors: Lukas Kaserer; Jakob Braun; Janko Stajkovic; Daniel Brennsteiner; Peter Singer; Benedikt Distl; Karl-Heinz Leitz; Heinrich Kestler; Wolfgang Schafbauer; Gerhard Leichtfried

The Additive Manufacturing (AM) process Laser Powder Bed Fusion (LPBF) makes it possible to produce Mo components with highly complex geometries in a resource-efficient way. Such complex components enable optimal functionalization and are of considerable industrial interest. The disadvantage of LPBF is that it is currently impossible to produce pure Mo components that achieve a similar strength and quality compared to their traditionally powder-metallurgically produced counterparts. Pure Mo components suffer from a coarse-grained, columnar, and cracked microstructure. Material adaptation to tolerate the unique solidification-boundary conditions in LPBF is necessary to improve component quality. In the present work, different alloying concepts to trigger grain refinement, to engineer grain boundary chemistry, and a combination of both are discussed. Furthermore, the effects on the microstructure and component quality are compared based on experimental results.