Authors:
Francisco R. Cruz (1), Daniel Gatões (1), Nanci Alves (2), A. Sofia Ramos (1), Teresa Vieira (1)
1- University of Coimbra, CEMMPRE – Centre for Mechanical Engineering, Materials and Processes, Department of Mechanical Engineering, Rua Luís Reis Santos, 3030-788, Coimbra, Portugal
2- ITJ – Internacional Moldes, Lda., Lugar de Embra, 2430-528, Marinha Grande, Portugal
Abstract:
Powder Bed Fusion (PBF) of tool steels as AISI H13 could contribute to a significant improvement of hardness by the presence of nanometric carbides. Moreover, with powder metallurgy new chemical compositions could be in gradient from top to inside 3D object. During additive manufacturing in liquid state, suitable powder mixtures of steel and vanadium &carbon allow the formation of nanocarbides. These elements are selected regarding the exceptional behavior of nanosized vanadium carbides in hardening. The cooling rate in the top surface of melt pool in PBF reaches 106 K/s, inducing carbides, from nanometric to micrometric, as the deepness of the analysis increases. In the present study, vanadium and graphene were added to AISI H13 powder. The possible carbon in excess, dissolved in the matrix, must be similar to the previous carbon percentage of H13 (0.35 %wt.). Nanometric vanadium carbide was distinguished by HRTEM after FIB on top of 3Dobjects.
DOI:
https://doi.org/10.59499/EP235765450