Carbide additivation of PBF-LB tool steels with functional polymer binders

  Carbide additivation of PBF-LB tool steels with functional polymer binders Copyright: © IWM  

Development of a process for carbide additives on tool steel powders using a functional polymer binder to improve the processability, microstructural isotropy and strength of hard iron alloys

Contact

Marie Luise  Köhler © Copyright: IWM

Name

Marie Luise Köhler

Group Process Technology

Phone

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+49 241 80 99245

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Motivation

While pre-alloyed powders for additive manufacturing seem to be limited in their alloy content due to cracking, the alloy content can be increased by using differently prepared feedstocks. Particle-reinforced alloys are being investigated to broaden the range of alloys that can be processed. Carbides added to the powder feedstock, which act as solidification nucleation sites, are expected to increase isotropy, reduce hot cracking and improve mechanical properties. To prevent segregation in the powder, polymer-based binders are used to ensure that the carbide particles stick to the steel base powder.

Objectives

The aim of the project is the additive manufacturing of carbide-rich iron alloys with reproducible, homogeneous and isotropic microstructures and good mechanical properties.

Contents

The alloys are developed by thermodynamic equilibrium and Scheil-Gulliver solidification calculations. The investigation includes the influence of "satelliting" on the rheological and thermophysical powder properties. Multi-scale microstructural investigations and static and dynamic mechanical tests characterize processability through LPBF, microstructure formation, and the benefits of an isotropic microstructure on mechanical properties. Grain size and microstructure become important indicators of the project’s success.

Project partner

  • Leibniz Institute for Interactive Materials (DWI)
  DFG Logo Copyright: © DFG

Research project number: BR 1844/49-1