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Laser metal direct forming method of liquid argon jet cooling directional solidification

A technology of directional solidification and liquid argon, which is applied in the field of laser metal direct forming, can solve the problems of temperature gradient reduction, affecting the microstructure and mechanical properties of formed parts, and the inability to maintain the complete directional growth of columnar crystals, etc.

Inactive Publication Date: 2012-07-25
XI AN JIAOTONG UNIV +1
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Problems solved by technology

Due to the continuous accumulation of heat in the process of laser metal direct forming, when the formed parts are piled up layer by layer to a certain height, the temperature gradient inside the formed part decreases from bottom to top, which makes the molten pool unable to maintain the columnar crystals during solidification. Fully oriented growth, which affects the microstructure and mechanical properties of the formed part

Method used

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  • Laser metal direct forming method of liquid argon jet cooling directional solidification
  • Laser metal direct forming method of liquid argon jet cooling directional solidification
  • Laser metal direct forming method of liquid argon jet cooling directional solidification

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Embodiment Construction

[0017] Such as figure 1 As shown, a laser metal direct forming method for liquid argon spray cooling and directional solidification adopts the following steps:

[0018] (1) Firstly, the solid wall is formed on the base plate by the method of multi-pass jointing to between 20 and 30 layers, and the thickness of each layer is 0.10 to 0.20 mm;

[0019] (2) Suspend the direct forming of laser metal, and spray liquid argon onto the two side walls of the formed solid wall through the liquid argon nozzle to make it cool rapidly, so as to ensure that the molten pool has a positive temperature gradient from bottom to top, so as to facilitate directional solidification Continuous epitaxial growth of columnar crystals, the structure is both fine and dense;

[0020] (3) Continue laser metal direct forming on the top layer of the cooled solid wall;

[0021] (4) After reshaping 10 to 20 layers, adopt step (2) to continue cooling the formed solid wall by spraying liquid argon;

[0022] (5...

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Abstract

The invention discloses a laser metal direct forming method of liquid argon jet cooling directional solidification. The method is characterized in that: positive temperature gradient is kept all the time along the Z-axis direction in a molten pool in the subsequent forming process by adopting a method of liquid argon jet and quick cooling performed below the formed layer once a certain layer number is stacked. Meanwhile, the liquid argon for cooling is converted into argon gas and can also be used for reducing oxygen content in an argon protection box. Therefore, the columnar crystal tissue in a formed piece is continuously grown from a substrate along the Z-axis forming direction, and the formed piece obtains complete directional solidification columnar crystal tissue.

Description

technical field [0001] The invention relates to a laser metal direct forming method, in particular to a laser metal direct forming method for liquid argon jet cooling and directional solidification, which is suitable for controlling the directional growth of columnar crystals in laser metal direct forming, and can also be applied to laser repair and laser Directional growth of cladding layer columnar grains in the cladding domain. Background technique [0002] Laser metal direct forming technology is an advanced manufacturing technology developed on the basis of laser cladding and combined with rapid prototyping technology. In the process of laser metal direct forming, the high-energy-density laser beam scans the substrate quickly, so that a thin layer on the surface of the substrate and cladding powder are quickly melted and solidified at an extremely fast cooling rate, and the cooling rate can reach 10 5 -10 9 K / s, based on the heat transfer and solidification characteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 李涤尘张安峰贺斌付伟鲁中良卢秉恒
Owner XI AN JIAOTONG UNIV
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