Metallurgical evaluation of laser sintered M3/2 HSS powder

Martins, Isabel M.; Esperto, Luís; Domingues, Joaquim Resina; Santos, Mário J. G.

http://hdl.handle.net/10400.9/461

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Authors

Martins, Isabel M.

Esperto, Luís

Domingues, Joaquim Resina

Santos, Mário J. G.

Abstract(s)

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.

Keywords

High speed steel M3/2 steel powder Rapid tooling DMLS

URI

http://hdl.handle.net/10400.9/461

Citation

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.