Abstract:
Microstructures of a single layer AISI M4 high speed steel deposited on a AISI D2 tool steel substrate using the L-DED process with two levels of global energy density were characterized and compared. A five-axes PRECO-SL 8600 CNC machine was used to deposit the M4 powder feedstock with a continuous wave laser source, near-infrared wavelength laser beam, 2.0mm spot size, and coaxial continuous feed nozzle. The M4 powder had particle sizes between 60 and 210µm and a volumetric mean diameter of 119µm. The quenched and tempered D2 substrate had a thickness of 15mm and a hardness of with 755 HV. Two laser power/scan speed sets were used: 700W/800mm/min and 1100W/500mm/min, that is GED = 26.3 J/mm2 and GED = 66 J/mm2, respectively. The microstructures were characterized through optical micrography, SEM and EDS, and WDS microanalyses. Five different zones could be distinguished, according to their microstructure features, and differences related to the energy density were analyzed.
Referência:
COLOMBO, Giovanna Fiocco; LIMA, Moysé Leite de; BOCCALINI JUNIOR, Mário; CORRÊA, Alzira Vicente de Oliveira; VEIGA, Marcelo T. Microstructure of deposited AISI M4 high speed steel on AISI D2 tool steel substrate using L-DED process. Berg Huettenmaenn Monatsh, v.169, n.1, p.3-8, 2024.
Acesso ao artigo no site do Periódico:
https://link.springer.com/article/10.1007/s00501-023-01418-4
