Taft Stettinius & Hollister LLP
Method for producing a single-crystalline workpiece
A method for producing or repairing a three-dimensional workpiece, the method including: depositing a sequence of layers of a raw material powder onto a substrate; after depositing a raw material powder layer, irradiating selected areas of the deposited raw material powder layer with an electromagnetic or particle radiation beam in a site selective manner in accordance with an irradiation pattern which corresponds to a geometry of at least part of a layer of the three-dimensional workpiece to be produced, the irradiation pattern including a scan pattern, wherein the substrate has a substantially single-crystalline microstructure; the irradiation is controlled so as to maintain the single-crystalline microstructure and to produce a metallurgical bond between sites of the raw material powder layer that are irradiated and the substrate and/or a previously deposited raw material powder layer, defining the scan pattern, so as to be one of a unidirectional or two directional scan pattern, rotating the scan pattern between two subsequently deposited raw material powder layers by a predetermined angle.
SLM Solutions Group AG
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Jiachun Dieter
Chen Schwarze