Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/461
Título: Metallurgical evaluation of laser sintered M3/2 HSS powder
Autor: Martins, Isabel M.
Esperto, Luís
Domingues, Joaquim Resina
Santos, Mário J. G.
Palavras-chave: High speed steel
M3/2 steel powder
Rapid tooling
DMLS
Data: 2007
Editora: Materiais 2007 – IV Inernational Symposium and 13th Portuguese Materials Society Meeting
Citação: Martins, Isabel M.; Esperto, Luís; Domingues, Joaquim Resina; Santos, Mário J.G. Metallurgical evaluation of laser sintered M3/2 HSS powder. Comunicação apresentada ao Materiais 2007 – IV Inernational Symposium and 13th Portuguese Materials Society Meeting, Universidade de Porto, 2007, 5p.
Resumo: Direct Metal Laser Sintering (DMLS) is one of the leading commercial rapid tooling (RT) technologies that produce 3D fully functional parts and tools directly from a CAD model. High Speed Steels (HSS) have the desired combination of hot hardness, wear resistance and toughness needed for applications such as cutting tools, special tools, inserts and dies that can be successfully developed in a near net shape by DMLS. This paper presents a study of DMLS of commercial water atomized M3/2 powder with different apparent densities. The effect of apparent density and DMLS process parameters on the surface morphologies and microstructure of laser sintered M3/2 powder was analysed and the optimum processing conditions to reduce balling effect were identified. Laser sintered M3/2 HSS with energy densities between 2.4 and 12 J/mm2 produced a coarse roughness (Rz) ranging from 135 to 234μm. The lowest roughness (65μm) was obtained with 36J/mm2, the highest laser energy density value used. The microstructure of laser sintered M3/2 HSS consisted of austenite, martensite and a fine carbide structure.
URI: http://hdl.handle.net/10400.9/461
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