A Metal Surface Alloying Method Using Inhomogeneous Heat Source to Promote Convection in Melt Pool

A metal surface and alloying technology, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of poor metal surface alloying effect, optimize alloy composition, reduce composition segregation, and ensure metal surface quality Effect

Active Publication Date: 2021-11-16
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a metal surface gas alloying method in which a non-uniform heat source promotes convection of the molten pool to solve the problem of poor metal surface alloying effect existing in the prior art

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  • A Metal Surface Alloying Method Using Inhomogeneous Heat Source to Promote Convection in Melt Pool

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experiment example

[0025] The experiment was carried out by laser gas nitriding of pure titanium metal surface. During the test, the parameters are: the first laser beam is a fiber laser, and the laser generator is a laser generator of the model YLS4000 produced by IPG Company in Germany. Laser wavelength: 1064nm, focal plane beam diameter is 3mm, laser beam defocus is 0mm, and laser beam-to-mouth distance is 30mm. Laser beam moving speed: 30mm / s, power 1400W, maximum power density at center point: 5.94*10 4 W / cm 2 , the average power density is about: 1.98*10 4 W / cm 2 . The second laser beam is fiber laser, and the laser generator adopts the laser generator of model YLS4000 produced by IPG Company of Germany. Laser wavelength: 1064nm, focal plane beam diameter is 3mm, laser beam defocus is 0mm, and laser beam-to-mouth distance is 30mm. Laser beam moving speed: 30mm / s, power 3200W, maximum power density at the beam center: 1.36*10 5 W / cm 2 , the average power density is about: 4.53*10 4...

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Abstract

The invention relates to a metal surface alloying method in which a non-uniform heat source promotes convection of a molten pool, comprising the following steps: 1) using a first heat source to heat and melt the metal surface to form a molten pool; 2) alloying gas entering the molten pool for reaction Compounds with high melting points are generated, and the compounds tend to solidify to form a solidified layer. The second heat source is used to heat the area where the compound is located to ensure that the compound does not solidify, promote the convection of the molten pool, and form an alloyed layer with uniform composition and structure. The first heat source and The second heat source is arranged in sequence along the moving direction of the heat source, and the power density of the second heat source is greater than that of the first heat source; 3) Along the moving direction of the heat source, the first heat source and the second heat source move as a whole, and the molten pool solidifies to form an alloy layers. The above-mentioned non-uniform heat source is used for laser gas alloying of the metal surface, and finally an alloyed layer with better structure and performance is obtained.

Description

technical field [0001] The invention relates to the technical field of metal surface laser gas alloying, in particular to a metal surface gas alloying method in which a non-uniform heat source promotes convection of a molten pool. Background technique [0002] During the fusion welding process, there is a large temperature gradient on the surface of the molten pool, resulting in a large surface tension gradient on the surface of the molten pool, which in turn drives the formation of Marangoni convection in the molten pool. Convection promotes the homogenization of components in the molten pool and optimizes the structure and properties of the weld. [0003] Laser gas alloying of metal surfaces can improve metal surface properties. The process engineering is divided into three stages: the first stage, the laser heats the metal, and the metal surface melts to form a molten pool; the second stage, the alloying gas enters the molten pool, and the molten pool reacts; the third s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/354
CPCB23K26/354
Inventor 石玗郭晋昌顾玉芬朱明张刚李春凯
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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