Method, use and apparatus for producing a single-crystalline work piece
AssigneeSLM Solutions Group AG
InventorsDieter Schwarze, Jiachun Chen
Life of this patent
Estimating the term…
Abstract
A method for producing or repairing a three-dimensional work piece, the method comprising the following steps: providing at least one substrate (15); depositing a first layer of a raw material powder onto the substrate (15); and irradiating selected areas of the deposited raw material powder layer with an electromagnetic or particle radiation beam (22) 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 work piece to be produced, wherein the irradiation is controlled so as to produce a metallurgical bond between the substrate (15) and the raw material powder layer deposited thereon. Moreover, a use and apparatus are likewise disclosed.
Claims14
A method for producing or repairing a three-dimensional metallic work piece having a substantially single crystalline microstructure, the method comprising the following steps:
- providing at least one substantially single-crystalline substrate;
- depositing a first layer of a metallic raw material powder onto the substrate;
- and
- 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 work piece to be produced,
- wherein
- the irradiation is controlled so as to produce a metallurgical bond between the substrate and the raw material powder layer deposited thereon, and the irradiation is controlled so that the following applies:
- a remelting rate of a remelting within a plane of a presently irradiated raw material powder layer Rx fulfils the following condition:
- Rx>0.3, with Rx=((W−dy)/W), W being a melt pool width and dy being a distance between adjacent irradiation sites of the raw material powder layer, wherein the distance dy is defined by adjacent scan vectors along which respective irradiation sites are arranged, and wherein the remelting results from radiation beam diameters of the radiation beam overlapping each other when being moved along the adjacent scan vectors.
Apparatus for producing or repairing a three-dimensional metallic work piece having a substantially single crystalline microstructure, the apparatus comprising:
- at least one substantially single-crystalline substrate;
- a powder application device adapted to depositing a first layer of a metallic raw material powder onto the substrate;
- and
- an irradiation device adapted to 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 a layer of the three-dimensional work piece to be produced, and
- a control unit adapted to controlling the irradiation device so as to produce a metallurgical bond between the substrate and the raw material powder layer deposited thereon, and the control unit controlling the irradiation device so that the following applies:
- a remelting rate of a remelting within a plane of a presently irradiated raw material powder layer Rx fulfils the following condition:
- Rx>0.3, with Rx=((W−dy)/W), W being a melt pool width and dy being a distance between adjacent irradiation sites of the raw material powder layer, wherein the distance dy is defined by adjacent scan vectors along which respective irradiation sites are arranged, wherein the remelting results from radiation beam diameters of the radiation beam overlapping each other when being moved along the adjacent scan vectors.
Dependencies are inferred from the claim text.