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Metal powder for use in an additive method for the production of three-dimensional objects and method using such metal powder

a three-dimensional object and additive technology, applied in the direction of additive manufacturing, process efficiency improvement, transportation and packaging, etc., can solve the problem that the conventional precipitation hardening process does not work for parts, and achieve the effect of increasing hardness

Inactive Publication Date: 2009-02-19
EOS ELECTRO OPTICAL SYST
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  • Abstract
  • Description
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  • Application Information

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Benefits of technology

[0066]The metal powder according to the invention has the advantage that the object produced can be post-hardened, in particular by means of precipitation hardening, to significantly increase the hardness. Furthermore, the mechanical properties of the three-dimensional object produced by an additive manufacturing method are similar to those achieved using conventional 17-4 PH stainless steel and a conventional manufacturing method. This opens a wide range of applications for laser sintering and other additive processes.

Problems solved by technology

It has been found that the conventional precipitation hardening process does not work for parts produced by direct metal laser sintering using powder material corresponding to stainless steel 17-4PH and typical processing parameters known from the prior art.

Method used

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  • Metal powder for use in an additive method for the production of three-dimensional objects and method using such metal powder
  • Metal powder for use in an additive method for the production of three-dimensional objects and method using such metal powder
  • Metal powder for use in an additive method for the production of three-dimensional objects and method using such metal powder

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Embodiment Construction

[0072]The invention will now be described with reference to the direct metal laser sintering process as an example for an additive manufacturing method. As shown in FIG. 1 the laser sintering apparatus comprises a build container 1 open at the top with a support 2 carrying the object 3 to be built. The support 2 is movable in the build container 1 in a vertical direction and is adjusted in such a way that the layer of the object which is to be solidified defines a working plane 4. A layer generating device 5 for generating a layer of pulverulent build material on the support or on a previously applied layer is provided. The laser sintering apparatus further comprises a laser 6 emitting a laser beam 7 which is deflected by a deflection unit 8 and passes through an optical unit 10 which focuses the laser beam onto the working plane 4. A control unit 9 controls the deflection unit 8 and the optical unit 10 in such a way that the laser beam 7 can be focussed to any position in the worki...

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Abstract

A metal powder for use in an additive production method of three-dimensional objects is disclosed. The powder is solidified by means of a laser or electron beam or another heat source and contains iron and the following components by weight percent (wt.-%):carbon: 0.07 max. wt-%,chromium: 14.00-15.50 wt.-%,nickel: 3.5-5.0 wt.-%, andcopper: 3.0-4.5 wt.-%.The powder particles have a median particle size d50 between 20 μm and 100 μm.

Description

BACKGROUND OF THE INVENTION[0001](1) Field of the Invention[0002]The invention relates to a metal powder for use in an additive method for the production of three-dimensional objects and to a method using such a powder.[0003](2) Description of Related Art[0004]Direct Metal Laser Sintering (DMLS) is a laser-based rapid prototyping and tooling process by means of which net shape parts are fabricated in a single process. Complex parts can be directly produced from 3D-CAD models by layer-wise solidification of metal powder layers in portions of the layer corresponding to the cross-section of the three-dimensional part in the respective layer. This process is described in detail for example in Juha Kotila et al., Steel-based Metal Powder Blend for Direct Metal Laser Sintering Process, Advances in Powder Metallurgy & Particular Materials—1999, Vol. 2 Part 5, p. 87-93 and in T. Syvanen et al., New Innovations in Direct Metal Laser Sintering Process—A Step Forward in Rapid Prototyping and M...

Claims

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Application Information

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IPC IPC(8): C22C38/42C22C38/60C22C38/44B22F3/105B22F7/02
CPCB22F3/105B22F2998/00C22C33/0285B22F9/08B22F1/0003B22F10/28B33Y70/00B33Y10/00B22F10/64Y02P10/25B22F1/00B22F1/05
Inventor SYVANEN, TATUNYRHILA, OLLIKOTILA, JUHA
Owner EOS ELECTRO OPTICAL SYST
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