Titanium alloy surface modification method and surface modified titanium alloy thereof

Abstract

The invention relates to the technical field of laser additive manufacturing, specifically discloses a titanium alloy surface modification method and a surface modified titanium alloy thereof. The titanium alloy surface modification method comprises the following steps that S1, a to be fusion covered surface of the titanium alloy base material is pre-treated; S2, the fusion covered material is prepared, after a titanium carbide spherical powder and a titanium alloy spherical powder are dried, the titanium carbide spherical powder and the titanium alloy spherical powder are mixed uniformly according to the mass ratio of 30-40 and 60-70 to obtain a mixed powder; and S3, laser cladding is carried out, the mixed powder in the step S2 is conveyed to a to-be-fusion covered region through a powder feeder in an inert gas atmosphere, a laser body is adopted to emit the laser to irradiate the surface of the titanium alloy to be fusion covered, and a mechanical arm cooperates with a set path to begin fusion covering, the surface modification of the titanium alloy is completed in a layer-by-layer fusion covering mode, and a stress treatment is performed immediately after the surface modification of the titanium alloy is completed.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing, and more specifically, to a method for modifying the surface of a titanium alloy and the surface modified titanium alloy. Background technique [0002] There are several methods for surface modification of titanium alloys. The first is to use vacuum nitriding to produce a ceramic layer on the surface of the titanium alloy. This method can increase the hardness of the titanium alloy surface. The depth of the hardened layer is not deep, and only a hardened coating of 50 μm can be achieved. The second method is to use vapor deposition, which can also achieve a hardened layer on the surface of the titanium alloy. The thickness of the hardened layer obtained by this method does not exceed 15 μm, and it is a non-metallurgical combination. The third method is to use ion implantation. Ion implantation is to directly inject ions into the titanium alloy matrix to improve the hardness ...

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Problems solved by technology

The fourth method is to adopt the method of micro-arc oxidation. This method can realize the growth of hardened ceramic layer on the surface of titanium alloy. The problem is that the grown ceramic layer is not metallurgically bonded, and it is easy to fall off.

In this patent, the titanium carbide powder plays a role similar to the functional phase, which plays a decisive role in the wear resistance and hardness of the coating, while the titanium alloy powder plays a role similar to the bonding phase; when the content of titanium carbide powder is added A small amount will affect the wear resistance and hardness of the coating; when the content of titanium carbide powder is added too much, there will be a large thermal stress due to thermal processing, and cracking will occur during the cladding process, especially the coating The thicker the thickness, the easier it is to crack, and there is no obvious trace of titanium carbide from the SEM metallographic image of the patent

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