Heat treatment of additively manufactured steel M789 – POSTER

Málková Andrea - West University of Bohemia (Czech Republic)

The poster will deal with the influence of heat treatment parameters of additively manufactured M789 steel on the mechanical properties and microstructure of the given steel. Steel M789 belongs to cobalt-free maraging steels with a high chromium content and was prepared by laser powder bed fusion (LPBF) method. As part of the study, the influence of the solution annealing temperature and the holding time, and the temperature and the holding time of the direct hardening of additively manufactured steel on its final properties was analysed. Furthermore, a two-step heat treatment was used, combining solution annealing and subsequent hardening of additively produced steel. Solution annealing led to a homogenization of the structure and an increase in the ductility of the material, as a result of hardening, steel-strengthening precipitates formed in the material. A combination of the previous effects occurred during the two-step heat treatment. A homogenized structure strengthened by small precipitates was created.

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