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Selective laser sintering processing of metallic components by using a Nd:YAG laser beam

The development of the selective laser sintering (SLS) technique used for rapid building of 3D models from metal powders is presented. The aim of research efforts in laser sintering is to create strong and dense models with no need post-machining. The feasibility of SLS is demonstrated by the mechanical properties of models obtained, which nearly the equivalent to the products formed by sintering in conventional way. However, the range of the materials available to SLS technique is limited to weldable metals and alloys. The main benefit of this laser application is the exact control of process parameters. A Nd:YAG laser working in CW regime was used. It was obtained sintered powder parts with a fine accuracy up to 0.4 mm. The shrinkage degree of height was lower than 10 percent. The microstructure and mechanical properties of SLS processed materials are similar with those of conventionally processed material. The strength and the bulk hardness of the sintered material were tested.