Authors:
Ziping Sang (Institute of Applied Powder Metallurgy and Ceramics at RWTH Aachen e.?V., Germany)
Yuanbin Deng (RWTH Chair and Institute for Materials Applications in Mechanical Engineering, Germany)
Meng Zhou (RWTH Chair and Institute for Materials Applications in Mechanical Engineering, Germany)
Emil-Elias Breuer (RWTH Manufacturing Technology Institute, Germany)
Anke Kaletsch (RWTH Chair and Institute for Materials Applications in Mechanical Engineering, Germany)
Thomas Bergs (RWTH Manufacturing Technology Institute, Germany)
Christoph Broeckmann (RWTH Chair and Institute for Materials Applications in Mechanical Engineering, Germany)
Abstract:
Metal Binder Jetting (MBJ) has attracted increasing attention due to its capability to produce parts with complex geometries. However, a major challenge is the anisotropic sintering shrinkage caused by interlayer pores in green parts. In this study, we aimed to overcome this challenge by developing numerical models to understand the potential formation mechanisms of the interlayer pores during printing of 17-4PH and the subsequent microstructural evolution during sintering. A numerical workflow combining Computational Fluid Dynamics and Discrete Element Method was developed to first study the powder-binder interactions in a single-layer powder bed. Based on the understanding of the effects of binder impact and migration, the initial anisotropic microstructure was generated for sintering modeling based on the kinetic Monte Carlo Potts model. In this way, the simulated microstructural evolution showed a good agreement with the characterized real sintered parts.
DOI:
https://doi.org/10.59499/EP256764481
