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Method for manufacturing metallic component by additive laser manufacturing

A component, metal technology, applied in the field of hot gas path components, which can solve problems such as not being systematically researched and developed, and achieve the effect of high life and operating performance

Inactive Publication Date: 2015-04-15
ANSALDO ENERGIA IP UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to date, the consequences of different curing processes in the core and shell regions have not been systematically studied and developed

Method used

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  • Method for manufacturing metallic component by additive laser manufacturing
  • Method for manufacturing metallic component by additive laser manufacturing

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Embodiment Construction

[0033] Studies of material properties produced by SLM using the "core-shell" principle (e.g. two different laser beam modalities) have shown different mechanical properties (e.g. Young's modulus, yield strength), depending on the laser Beam shaping and thus laser intensity. This is a result of locally different curing conditions obtained with different laser beam shaping during SLM powder bed processing. This favors faster grain growth, preferably perpendicular to the powder plane, due to the typical temperature distribution in the melt pool and the thermal gradients generated in its vicinity. This results in a characteristic microstructure showing grains elongated in a direction perpendicular to the plane of the powder (z-axis direction). It has been found that samples produced with smaller laser beam diameters (approximately 70-100 μm) have different mechanical properties in the xy plane and along the z-axis direction than those produced with large beam diameters (approxima...

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Abstract

The invention refers to a method for manufacturing a three-dimensional metallic article / component made of a Ni-, Co-, Fe-based superalloy or combinations thereof, entirely or partly, by a powder based additive manufacturing process. During the step of performing powder melting by scanning a dual laser setup is used, where two laser beams of different beam properties are combined in the same machine and by adjusted beam profiling and integration of a suitable beam switch in a controlled manner a switching between two different laser beam diameters is performed. In each layer the laser beam with the smaller diameter scans the whole area and in every kth layer, with k>1, the laser beam with the larger diameter scans the area where a coarse grain size is needed thereby remelting the area with fine grain sizes. With such a manufacturing method higher lifetime and operation performances of metallic parts and prototypes can be reached.

Description

technical field [0001] The present invention relates to the technology of high temperature resistant components, especially for hot gas path components of gas turbines. It relates to a method for manufacturing metal parts / three-dimensional objects by additive manufacturing techniques, such as selective laser melting (SLM) or selective laser sintering (SLS). Background technique [0002] Additive manufacturing has become an increasingly attractive solution for the manufacture of metal functional prototypes and metal components. Currently known SLM, SLS and EBM methods use powdered materials as matrix materials. Parts or articles are produced directly from the powder bed. Other additive manufacturing methods such as laser metal forming (LMF), laser engineered net shape (LENS) or direct metal deposition (DMD) locally fuse material onto existing components. This newly created material can be deposited as wire or powder, with the powder deposition apparatus moved along a prede...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F10/28
CPCC22C19/03B22F2003/248B22F2003/1057B33Y50/02B22F3/24B22F3/1055C22C19/07B23K26/345B29C67/0088B33Y10/00B33Y80/00C22C38/00C22C19/055B23K26/342Y02P10/25B22F10/28B22F10/38B22F10/364
Inventor T.埃特M.霍伊贝J.舒尔布F.罗伊里格
Owner ANSALDO ENERGIA IP UK LTD
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